When to Water Your Lawn in Florida

When to Water Your Lawn in Florida: Month-by-Month Schedules for Established Lawns

Watering an established lawn in South Florida isn’t something you set once and forget. The difference between a January week and a July week — in temperature, humidity, evaporation, and rainfall — is enormous, and your irrigation schedule needs to reflect that.

Most lawns in Palm Beach County run into trouble not because the homeowner doesn’t water, but because the schedule never changes. A timer set for summer keeps running through winter, drowning the lawn in moisture it doesn’t need and inviting fungus. Or a conservative winter schedule carries into May, and the lawn starts browning as evaporation outpaces irrigation.

This guide gives you specific watering recommendations for every two-month window of the year, along with seasonal watch-outs for pests, disease, and weather events — plus everything you need to know about water restrictions, irrigation equipment, grass type differences, and troubleshooting.

Just installed new sod? This guide is for established lawns. For week-by-week establishment schedules adjusted by season, see our New Sod Watering Guide.

Palm Beach County Water Restrictions

Palm Beach County follows South Florida Water Management District regulations year-round. These rules apply to all irrigation sources — city water, wells, lake, and reclaimed systems.

Allowed watering days:

Odd-numbered addresses: Wednesday & Saturday
Even-numbered addresses: Thursday & Sunday
No watering between 10:00 AM and 4:00 PM

Violations can lead to warnings or fines up to $500 for repeat offenses. Enforcement has become stricter in response to ongoing statewide water concerns.

Palm Beach County also enforces seasonal fertilizer restrictions (June–September), which limit nitrogen applications during the rainy season and directly impact your lawn care strategy.

Rain sensors are required by law. Any automatic irrigation system in Florida must have a functioning rain shutoff device. This sensor overrides your sprinklers when sufficient rain has fallen, preventing wasteful overwatering.

Core Watering Principles

Before diving into the monthly schedules, these fundamentals apply year-round:

Deep and infrequent beats shallow and often. Palm Beach County’s sandy soil holds about one inch of water in the top twelve inches — the same depth where most grass roots grow. A single deep watering saturates this zone. Frequent light watering keeps roots shallow and weak.

Water before sunrise. The ideal window is 4:00–6:00 AM, when winds are calm and evaporation is minimal. Blades dry by midday, which reduces fungal risk. Avoid midday irrigation (most water evaporates) and evening watering (promotes fungus).

Apply ¾ inch per session. This is the target for most watering cycles. It’s enough to saturate the root zone in sandy soil without creating runoff or waste. What changes by season is how often you run that cycle — not how much you apply per session.

Always check before you water. Use the screwdriver test (push a 6-inch screwdriver into the soil — it should slide in easily 4–6 inches if moisture is adequate) or the footprint test (if grass springs back after you walk on it, it’s hydrated; if footprints stay visible, it needs water).

Subtract rainfall. Use a rain gauge to track what nature provides. If your yard received ½ inch or more from a storm, skip or reduce your next scheduled irrigation. Florida storms are localized — your gauge matters more than the forecast.

Month-by-Month Watering Schedule

All recommendations below assume an established lawn (rooted for 6+ weeks), full-sun conditions, and a target of ¾ inch per watering session. Shaded areas generally need 25–40% less water. Always adjust based on your own soil moisture checks and actual rainfall.

November – December: Early Dry Season

Conditions: Temperatures drop to daytime highs in the low-to-mid 70s with nighttime lows in the 50s and 60s. Rainfall tapers off sharply. Evaporation is low. Growth slows significantly for all warm-season grasses.

	Frequency	Weekly Target (incl. rain)	Rotors per Session	Sprayers per Session
St. Augustine	1–2x per week	¾ – 1 inch	50–60 min	25–30 min
Zoysia	1x per week	½ – ¾ inch	45–55 min	20–25 min
Bermuda	1x per week (or less)	½ – ¾ inch	45–55 min	20–25 min

What to Watch For

Brown patch and large patch fungus. The #1 lawn threat of the cool season. Big swings between daytime highs and nighttime lows, combined with moisture, create ideal fungal conditions. Watch for circular brown or yellow patches. Water only in the early morning so blades dry by midday.

Overwatering is the most common winter mistake. Many homeowners leave their irrigation timers on a summer schedule. With low evaporation and slow growth, this drowns the root zone and feeds fungal disease. Dial back now.

Bermuda and Zoysia slowdown. These grasses may go semi-dormant and develop a tan or straw color. This is normal in Palm Beach County winters. Don’t increase watering to try to “green them up” — you’ll cause more harm than good.

Reduced mowing. Growth slows considerably. Mow less frequently and avoid scalping, which stresses the plant heading into the coolest months.

January – February: Peak Dry Season

Conditions: The coolest and driest months. Daytime highs in the mid-60s to low 70s, nighttime lows occasionally dipping into the 40s. Little to no rainfall. Evaporation is at its lowest point of the year.

	Frequency	Weekly Target (incl. rain)	Rotors per Session	Sprayers per Session
St. Augustine	1x per week	½ – ¾ inch	50–60 min	25–30 min
Zoysia	Every 7–10 days	½ inch	45–55 min	20–25 min
Bermuda	Every 10–14 days	½ inch	45–55 min	20–25 min

What to Watch For

Frost and freeze events. When freezes are forecast, water the lawn the evening before — moist soil retains heat and protects roots. Do not water during or immediately after a freeze event.

Fungal pressure continues. Brown patch and large patch remain active through February. Avoid overwatering and water early in the morning only.

Dry northwest winds. January and February often bring dry winds that accelerate evaporation along edges, south-facing slopes, and areas near pavement. Hand-water these spots if they show stress while the rest of the lawn is fine.

Pre-emergent herbicide timing. Late January through February is the window for spring pre-emergent applications targeting crabgrass and other summer annuals. Water in herbicides per label instructions — usually ½ inch within 24 hours of application. Prodiamine is one of the most effective options for South Florida lawns.

Don’t panic about color. A slightly faded or tan lawn in winter is normal for warm-season grasses. It will bounce back as temperatures rise. Overwatering now to chase green causes root rot and fungus.

March – April: Spring Transition

Conditions: Temperatures climb from the mid-70s into the mid-80s. Humidity begins increasing. Occasional spring showers but generally still dry. Your lawn is breaking dormancy and entering active growth — water demand ramps up.

	Frequency	Weekly Target (incl. rain)	Rotors per Session	Sprayers per Session
St. Augustine	2x per week	¾ – 1 inch	50–60 min	25–30 min
Zoysia	1–2x per week	¾ inch	45–55 min	20–25 min
Bermuda	1–2x per week	¾ inch	50–60 min	25–30 min

What to Watch For

Spring green-up. As soil warms, grass breaks dormancy and growth accelerates. Water demand increases — watch for the first signs of stress (visible footprints, slight wilting) and respond by adding a second weekly session.

Chinch bugs emerge. These destructive pests become active as temps rise into the mid-80s. Watch for irregular yellowing patches in sunny areas near driveways, sidewalks, and along the street. Learn the signs and treatment options. Early detection is critical.

Weed pressure spikes. Spring is peak germination time for crabgrass, spurge, and other summer annuals. If your pre-emergent was applied on time, this should be controlled. If not, monitor closely and consider post-emergent weed treatment.

Increasing evaporation. By late March, longer days and rising heat mean your lawn dries out faster. Don’t wait for obvious stress — proactively increase watering frequency as you feel the season shift.

Irrigation system check. This is the time to inspect all zones, clean nozzles, check spray patterns, and verify your rain sensor is working before the demanding summer months hit.

May – June: Early Wet Season

Conditions: Hot and increasingly humid. Daytime highs regularly reaching the upper 80s to low 90s. Afternoon thunderstorms begin but are highly localized and unpredictable. This is the start of the most active growth period.

	Frequency	Weekly Target (incl. rain)	Rotors per Session	Sprayers per Session
St. Augustine	2–3x per week	1 – 1¼ inches	50–60 min	25–30 min
Zoysia	2x per week	¾ – 1 inch	45–55 min	20–25 min
Bermuda	2x per week	¾ – 1 inch	50–60 min	25–30 min

What to Watch For

Afternoon storms: helpful but unreliable. Florida summer rain is extremely localized. A neighborhood a mile away may get an inch while your yard gets nothing. Use a rain gauge on your property — don’t rely on forecasts or what you see in the distance.

Chinch bugs at peak activity. May through July is prime chinch bug season. Irregular dead patches in full-sun areas are the signature sign. New damage can appear rapidly — contact a professional for insect control if you spot an infestation.

Sod webworms and armyworms. Watch for small moths flying low over the grass at dusk — they’re laying eggs. Brown patches with chewed-down blades indicate an active sod webworm infestation.

Gray leaf spot. Heat + humidity is the perfect recipe, especially for St. Augustine. Avoid evening watering and monitor for small, oval tan lesions on blades. See our fungus identification guide for photos and treatment options.

Fertilizer blackout begins. Many Palm Beach County municipalities restrict fertilizer application starting June 1. Check your local ordinance — applying nitrogen during the blackout window can result in fines. See our summer blackout treatment schedule for what you can apply during this period.

July – August: Peak Summer

Conditions: The most demanding months for your irrigation system. Daytime highs of 90–95°F, intense sun, and high humidity. Frequent but erratic afternoon thunderstorms can deliver heavy rain one day and nothing the next. Peak growth period for all warm-season grasses.

	Frequency	Weekly Target (incl. rain)	Rotors per Session	Sprayers per Session
St. Augustine	2–3x per week (adjust for rain)	1 – 1½ inches	50–60 min	25–30 min
Zoysia	2x per week (adjust for rain)	¾ – 1 inch	45–55 min	20–25 min
Bermuda	2x per week (adjust for rain)	¾ – 1 inch	50–60 min	25–30 min

What to Watch For

Overwatering is the hidden summer danger. Between your irrigation schedule and daily thunderstorms, it’s easy to give the lawn too much. Squishy soil, standing water, mushrooms, or algae on the surface all signal excess moisture. Your rain sensor should be catching most of this — if it isn’t, test and recalibrate.

Pythium and root rot. Waterlogged soil in extreme heat is a recipe for root rot. If patches of your lawn feel mushy or spongy, reduce watering immediately and treat with fungicide.

Dollar spot. Forms small, silver-dollar-sized brown patches when moisture is inconsistent — common when homeowners alternate between overwatering and underwatering week to week. Consistent scheduling is the best prevention.

Summer fertilizer blackout continues. Most Palm Beach County municipalities prohibit nitrogen application through September 30. Stick to iron-only or micronutrient products if you need to address color. See our summer blackout treatment schedule for alternatives.

Water bills spike. Summer irrigation can add $100–150/month to utility costs. Make sure every drop counts — fix leaks, adjust misaligned heads, and let rain do its job.

September – October: Late Wet Season

Conditions: Still hot but beginning to moderate by late October. Afternoon storms continue but become less frequent. September and October are the historical peak of hurricane season. Growth remains active but begins slowing as days shorten.

	Frequency	Weekly Target (incl. rain)	Rotors per Session	Sprayers per Session
St. Augustine	2x per week	¾ – 1 inch	50–60 min	25–30 min
Zoysia	1–2x per week	¾ inch	45–55 min	20–25 min
Bermuda	1–2x per week	¾ inch	50–60 min	25–30 min

What to Watch For

Hurricane season peak. Heavy rain events can saturate your lawn for days. After tropical storms, hold off on all irrigation until the soil has drained and dried. Avoid walking on waterlogged turf — compacting saturated soil causes long-term structural damage.

Fall armyworms. A second wave of armyworm activity often hits in early fall. Inspect for rapidly expanding brown patches and chewed-down blades, especially in the early morning. Learn more about sod webworms and armyworms.

Transition your schedule. As temperatures drop through October, your lawn’s water needs decline. Don’t carry a summer schedule into November. Begin reducing frequency and pay attention to soil moisture — you may be able to skip sessions more often than you expect.

Fertilizer blackout ends September 30. October is a good window for a fall fertilizer application to strengthen the lawn heading into winter. Apply a balanced slow-release formula with potassium for root strength. See our guide on when to fertilize your lawn in Florida.

Fall pre-emergent timing. Late September through October is the window for fall pre-emergent herbicides targeting cool-season weeds like annual bluegrass (Poa annua). Prodiamine is a top choice — water in per label directions.

Watering by Grass Type

All warm-season grasses used in South Florida follow the same basic principle — deep, infrequent watering — but their tolerances and stress signals differ.

St. Augustine

The dominant turfgrass in Palm Beach County. St. Augustine thrives in sandy soils, partial shade, and coastal humidity. Most varieties need about 1 inch of water per week during active growth, delivered in 2–3 deep sessions. St. Augustine shows water stress very quickly — blades fold, color goes dull, and footprints stay visible. It’s also the grass most prone to common issues when watering is off.

Cultivar Differences

Cultivar	Drought Tolerance	Shade Tolerance	Key Watering Notes
Floratam	Good	Low (full sun)	Tolerates slightly drier cycles. Let top inch of soil dry between waterings. Overwatering leads to weak roots and disease.
Palmetto	Moderate	Good	Prefers more consistent moisture. Don’t let it dry out as much as Floratam. More prone to gray leaf spot under prolonged leaf wetness.
CitraBlue	Good	Moderate	Deep blue-green color holds even under moderate stress. Water deeply but infrequently. Overwatering reduces its natural disease resistance.
ProVista	Moderate	Moderate	Dense canopy traps humidity at soil surface. Early-morning watering is critical. Avoid frequent light cycles — promotes thatch buildup.

Bermuda

Bermuda grass thrives in full sun and well-drained sandy soils. Ideal for large open lawns, sports areas, and equestrian properties. Needs about ¾ – 1 inch per week in 2 deep sessions. Bermuda has excellent drought tolerance and greens up quickly after rain.

In winter, Bermuda goes semi-dormant and turns tan — this is normal. Reduce watering to once every 10–14 days or pause entirely when rainfall is adequate. Overwatering during dormancy invites fungal problems.

Zoysia

Zoysia grass offers a lush, fine texture with excellent drought tolerance once established. Requires about ¾ – 1 inch per week, applied deeply and infrequently. Constant moisture or shallow watering encourages thatch and large patch fungus.

Allow the soil surface to dry slightly between waterings. Aerate periodically to improve infiltration in compacted areas. Zoysia’s dense growth habit can make it slow to show stress — check soil moisture proactively rather than waiting for visual cues. Learn more about Zoysia installation and care.

Irrigation System Types & Runtimes

How long you run your system depends on what type of heads you have. Use the tuna can test to calibrate: place several tuna cans across one zone, run the system for 15 minutes, and measure the water depth. If you collect about 0.2 inches in 15 minutes, that zone needs roughly 55–60 minutes to apply ¾ inch.

System Type	Coverage	Typical Runtime for ¾ inch	Best For
Pop-up spray heads	Up to 15 feet	25–35 minutes	Small zones, tight areas
Rotor systems	Up to 40 feet	50–70 minutes	Larger open areas
Drip irrigation	Direct root zone	Varies by emitter	Beds, shrubs, palms (saves 30–50% vs. spray)
Micro-spray	5–12 feet	30–45 minutes	Mixed lawn and landscape beds

Monthly maintenance checklist: Inspect spray patterns, clean or replace clogged nozzles, test rain sensors, and check for leaks or misaligned heads. Salt air and sandy debris are common causes of system problems in Palm Beach County. Update your timer programming seasonally — this is the single most impactful thing you can do to prevent overwatering.

Recognizing Watering Problems

Signs of Overwatering

Yellowing, thinning turf that feels soft or spongy
Persistent wet or muddy patches that don’t drain
Mushrooms, algae, or mold growth on the surface
Increased weeds — especially dollarweed and sedges, which thrive in wet soil
Sour or musty smell from the soil

If these sound familiar, read our full guide on overwatered sod for diagnosis and recovery steps.

Signs of Drought Stress

Grass blades fold lengthwise or curl to conserve moisture
Color shifts to a dull bluish-gray
Footprints remain visible after walking across the lawn
Grass feels brittle, crispy, or crunchy underfoot

One deep watering session (¾ inch) typically restores color within 2–3 days. If drought symptoms persist, check for uneven sprinkler coverage or clogged nozzles rather than simply adding more water. For extended dry periods, see our guide on managing severe drought.

Fungal Disease Prevention

The three most common fungal diseases in Palm Beach County lawns are directly tied to watering habits:

Gray leaf spot: Most common in St. Augustine during humid summer months. Fueled by evening watering and overwatering.

Brown patch / large patch: Appears in cooler months (November–March) when watering is excessive. Circular brown patches that expand outward. Temperature swings between day and night accelerate the spread.

Dollar spot: Small brown patches that form when moisture is inconsistent — alternating between too wet and too dry.

In almost every case, correcting irrigation timing and frequency resolves the problem faster than fungicide alone. Water early, water deeply, and let the soil dry between sessions.

Water Conservation & Smart Irrigation

Measure Your Output

The tuna can test is the simplest way to know exactly what your system delivers. Place 4–6 cans across a zone, run for 15 minutes, and measure the depth. This reveals both your application rate and any coverage gaps.

Upgrade Your Equipment

Rain sensors (required by law) cut irrigation by 15–30% by pausing during and after rainfall.
Smart controllers adjust schedules automatically based on temperature, humidity, and rainfall data. Typically reduce water consumption by 15–30%.
Soil moisture sensors measure ground moisture directly and fine-tune watering cycles to actual need.

These technologies cost more upfront but often pay for themselves within 2–3 years through lower water bills.

Landscape for Efficiency

Replace some turf with drought-tolerant natives like coontie, firebush, and dwarf yaupon holly.
Maintain 2–3 inches of mulch around beds and trees to retain moisture and reduce irrigation needs by up to 30%.
Group plants with similar water requirements (hydrozoning) to prevent waste from one-size-fits-all zone scheduling.

Managing Water Costs

Efficient irrigation makes a significant difference on your utility bill:

Season	Typical Monthly Water Cost (Irrigation)	Key Savings Lever
Summer (May–Oct)	$100–150/month	Subtract rainfall; let rain sensor do its job
Winter (Nov–Apr)	$30–60/month	Reduce frequency; don’t run a summer schedule

A working rain sensor ($50–100 installed) can save up to $400 annually. A smart controller ($200–500) typically reduces total consumption by 15–30% per year. The biggest savings come from simply updating your timer programming each season — which costs nothing.

Responding to Drought Conditions

During drought periods or mandatory water restrictions, prioritize in this order:

Mature trees and palms — they’re the most valuable and hardest to replace
Shrubs and landscape plantings
Lawn — turf can survive temporary dormancy and recover; trees often cannot

Hand watering with a shut-off hose nozzle is usually permitted even under strict restrictions and can protect critical plants. Let the lawn go dormant if necessary — it will come back when water returns.

FAQs

How often should I water my lawn in South Florida?

It depends on the season and your grass type. During peak summer (July–August), most lawns need watering 2–3 times per week. During the coolest months (January–February), once a week — or even less for Bermuda and Zoysia — is usually sufficient. The month-by-month tables above give you specific guidance for each grass type throughout the year.

How long should I run my sprinklers each time?

Long enough to apply about ¾ inch of water. For pop-up spray heads, that’s typically 25–35 minutes per zone. For rotors, 50–70 minutes. Your specific system may vary — run the tuna can test to calibrate. What changes seasonally is how often you run each cycle, not how long each cycle runs.

Can I water my lawn every day in Palm Beach County?

No. Year-round watering restrictions limit residential irrigation to two designated days per week. Even if you could water daily, you shouldn’t — daily shallow watering produces shallow roots and increases disease pressure. Deep, infrequent watering on your allowed days is far more effective.

What time should I water my lawn?

Between 4:00 and 6:00 AM is ideal. This minimizes evaporation, takes advantage of calm winds, and gives grass blades time to dry before nightfall. Watering between 10 AM and 4 PM is prohibited under Palm Beach County restrictions and wastes water to evaporation. Evening watering promotes fungal disease.

Should I water after it rains?

If your yard received ½ inch or more of rainfall, skip your next scheduled irrigation. Use a rain gauge on your property to measure actual rainfall — South Florida storms are notoriously localized. Your rain sensor should be handling this automatically, but verify it’s functioning properly.

My lawn is turning brown in winter — should I water more?

Probably not. Some browning or color fading in winter is normal, especially for Bermuda (which goes semi-dormant) and Zoysia. Increasing water in cool weather is the most common cause of winter fungal disease. Check soil moisture before adding water. If the screwdriver slides in easily, the soil is fine — the grass is just slowing down for the season.

How do I know if I’m overwatering?

Squishy or spongy soil, persistent wet patches, mushrooms or algae on the surface, and an increase in weeds like dollarweed and sedges are all classic signs. If your lawn is yellowing despite plenty of water, overwatering is more likely than drought. Cut back and see if conditions improve within 1–2 weeks.

What’s the difference between rotors and spray heads?

Spray heads (pop-ups) deliver water in a fixed fan pattern over a short distance (up to 15 feet) and apply water relatively quickly — about ¾ inch in 25–35 minutes. Rotors rotate a stream across a larger area (up to 40 feet) but deliver water more slowly — about ¾ inch in 50–70 minutes. If you have mixed zones, they should run on separate schedules to avoid overwatering spray zones or underwatering rotor zones.

Do shaded areas need less water?

Yes. Shaded areas lose less moisture to evaporation and generally need 25–40% less water than full-sun zones. However, they’re more prone to fungal problems because moisture lingers. If your irrigation system allows it, run shaded zones on a separate schedule. Always water shaded areas in the early morning.

Is it worth upgrading to a smart irrigation controller?

For most homeowners, yes. Smart controllers adjust your watering schedule automatically based on weather data, which eliminates the most common mistake — running a summer schedule in winter (or vice versa). They typically reduce water consumption by 15–30% and pay for themselves within 2–3 years. They’re especially valuable if you travel or simply don’t want to manually adjust your timer six times a year.

When should I fertilize my lawn relative to watering?

Water lightly after applying granular fertilizer — about ½ inch within 24 hours — to wash granules off the blades and into the soil. Don’t apply fertilizer to dry, stressed turf (water first, then fertilize the next day). During Palm Beach County’s fertilizer blackout (typically June 1 – September 30), nitrogen applications are restricted. Use iron-only products for color during this period. See our complete guide on when to fertilize your lawn in Florida.

My sprinklers run but parts of my lawn are still dry. What’s wrong?

Uneven coverage is one of the most common irrigation problems. Run each zone and walk the yard looking for dry corners, areas where heads are blocked by plant growth, or zones where heads have shifted and no longer overlap properly. The tuna can test will reveal exactly which areas are getting less water. Often a simple head adjustment or nozzle cleaning solves the problem — you don’t need to water more, you need to water more evenly.

I just installed new sod — should I follow this guide?

No. New sod requires a completely different approach — frequent, light watering that tapers over several weeks as roots establish. The schedule also varies significantly depending on what time of year you install. See our New Sod Watering Guide for season-specific establishment schedules.