A month-by-month schedule for Florida lawns — when to fertilize, overseed, aerate, apply pre-emergent, mow, and water, keyed to the state's climate and grass types.
Dominant grasses: St. Augustine, Bahia, Zoysia, Bermuda, Centipede
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Current month
July in Florida
Peak heat, rain, and growth, still under the fertilizer blackout. Manage water carefully and stay on top of fungus.
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Water: Don't overwater in the rain
With daily afternoon storms, turn the irrigation off or way down. Constant wet soil breeds gray leaf spot and root rot in St. Augustine.
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Weed Control: Watch for gray leaf spot
Gray leaf spot shows as gray-brown lesions on St. Augustine blades in the hot, wet stretch. Improve airflow and back off water before reaching for fungicide.
In Florida, the next Saturday job is active warm-season maintenance. Water early, feed only growing turf, and skip cool-season seed unless you are intentionally planning a winter overseed.
Step 1
Lock the early water window
Run irrigation before heat and wind climb, then fix dry edges or overspray before the next mowing cycle bakes the pattern into the lawn.
Florida grows warm-season grass on a year-round clock, which makes it the opposite of the cool-season North in almost every way. St. Augustine dominates Florida lawns, with Bahia on larger and drier lots, plus zoysia, Bermuda, and centipede in the mix. The grass barely goes dormant in the southern half of the state, so there's no real off-season — there's a hot, rainy growing surge from summer into early fall and a slower, cooler stretch in winter.
Two things make the Florida calendar unusual. The first is the summer fertilizer blackout: most Florida counties legally ban applying nitrogen and phosphorus fertilizer during the rainy season — typically June 1 through September 30 — to keep nutrients out of the waterways and springs. That flips the normal logic. You feed in spring and again in fall, but you do NOT feed during the peak growing months, even though the grass is roaring. Check your county's exact dates, because they vary.
The second is pests and disease. Florida's heat and humidity make chinch bugs the number-one St. Augustine killer — they create expanding yellow-then-brown patches that look like drought but won't respond to water. Add in sod webworms, gray leaf spot, and large patch fungus, and pest scouting becomes a core part of the calendar rather than an afterthought. Water management matters too: many districts impose year-round watering-day restrictions, so a smart controller that makes the most of your allowed days earns its keep fast.
Key Dates to Hit in Florida
Spring feeding (pre-blackout)
April – May
Feed before the summer fertilizer blackout begins. The grass is fully active by now.
Summer fertilizer blackout
June 1 – Sept 30 (varies by county)
Most counties ban N and P fertilizer in the rainy season. Check your local ordinance.
Chinch bug scouting
May – September
The peak season for the St. Augustine killer. Scout sunny, dry edges weekly.
Fall feeding (post-blackout)
October
Resume feeding once the blackout lifts to push the lawn through the cooler winter.
The Year at a Glance
🌱 Spring
The grass is fully active. Feed before the summer blackout, watch for the first chinch bugs, and get into a regular mowing rhythm.
☀️ Summer
Peak heat, rain, and growth — but no fertilizer under the county blackout. Mow often, scout hard for chinch bugs and webworms, and manage water under district rules.
🍂 Fall
The blackout lifts. Resume feeding, keep scouting for large patch as nights cool, and ease the lawn toward its slower winter pace.
❄️ Winter
Slow growth in the south, light dormancy in the north. Mow occasionally, watch for cold snaps, and hold off on heavy work.
Month-by-Month Calendar
January
Light
Slowest month. North Florida grass may be semi-dormant and tan; South Florida keeps growing slowly. Mow as needed.
✂️
Mow: Mow as needed
Growth is slow but rarely stops in South Florida. Don't scalp — keep St. Augustine tall even in winter. Hold off on fertilizer.
February
Light
Still slow, but South Florida starts picking up. Apply pre-emergent for summer weeds as soil warms.
🛡️
Pre-Emergent: Apply pre-emergent
Florida's warm soil means crabgrass and summer weeds germinate early. A February-March pre-emergent application gets ahead of them.
A soil test tells you what the lawn actually needs before the spring feeding, and many Florida soils are already high in phosphorus.
April
Peak
Prime spring feeding window — before the summer blackout. The grass is fully active and pests are stirring.
🌱
Fertilize: Spring feeding
Feed now, before the June fertilizer blackout. Use a slow-release nitrogen product spread evenly. This is one of only two legal feeding windows in much of Florida.
Chinch bugs start working sunny, dry St. Augustine edges in spring. Part the grass at the edge of yellowing spots and look for small black-and-white insects.
May
Peak
Hot and growing hard. Last feeding before the blackout in most counties. Scout pests weekly and dial in irrigation.
💧
Water: Set up smart irrigation
Many Florida districts enforce year-round watering-day limits. A smart controller maximizes your allowed days, uses rain skip, and prevents the overwatering that breeds fungus.
May into September is peak chinch bug season. Catching an infestation early — before the brown patch spreads — saves the whole lawn.
June
Active
Summer fertilizer blackout begins in most counties. Heavy rain and growth, but no feeding. Mow often, scout hard.
✂️
Mow: Mow frequently
Rainy-season St. Augustine grows fast — you may mow twice a week. Keep it tall and never remove more than a third at once to avoid stressing it in the heat.
🌿
Weed Control: Scout chinch bugs and webworms
Peak pest pressure. Sod webworms chew notched, ragged blades; chinch bugs leave expanding brown patches in the sun. Treat only the affected zones.
July
Current monthActive
Peak heat, rain, and growth, still under the fertilizer blackout. Manage water carefully and stay on top of fungus.
💧
Water: Don't overwater in the rain
With daily afternoon storms, turn the irrigation off or way down. Constant wet soil breeds gray leaf spot and root rot in St. Augustine.
🌿
Weed Control: Watch for gray leaf spot
Gray leaf spot shows as gray-brown lesions on St. Augustine blades in the hot, wet stretch. Improve airflow and back off water before reaching for fungicide.
August
Active
Still hot, wet, and growing — blackout continues. Keep mowing and scouting; the feeding window reopens soon.
✂️
Mow: Continue frequent mowing
Keep up with the rainy-season growth. Sharp blades matter — torn St. Augustine blades invite disease in the humidity.
🌿
Weed Control: Keep scouting pests
Chinch bugs, webworms, and armyworms all peak in late summer. Weekly scouting is the cheapest pest control you'll do.
September
Active
The fertilizer blackout lifts at month's end in most counties. Growth stays strong; prep for the fall feeding.
🌿
Weed Control: Watch for fall armyworms
Armyworms can strip a Florida lawn in days in early fall. Scout for them and the chewing damage they leave, especially after the blackout's pest buildup.
💧
Water: Adjust irrigation as rain eases
As the daily storms taper, the lawn will need supplemental water again. Let your smart controller transition based on actual rainfall.
Post-blackout feeding window. Resume fertilizing and watch for large patch as nights cool.
🌱
Fertilize: Fall feeding
With the blackout lifted, feed to push the lawn through the cooler season and into next spring. A potassium-rich fall product improves winter hardiness in North Florida.
Raise the cut slightly and mow less often as growth slows. Keep St. Augustine tall heading into the cooler months.
December
Light
Slowest stretch returns. North Florida may see frost; protect tender areas and hold off on feeding.
🍂
Cleanup: Watch for cold snaps
A hard freeze browns St. Augustine in North and Central Florida. Don't mow or fertilize stressed, cold-damaged turf — let it recover on its own in spring.
Continue at Premium Grass Seeds
Use the Florida calendar to decide timing before you buy.
Start with the state guide. If it says to wait, do not buy starter fertilizer for immediate use; save the remaining links for the next viable warm-season establishment window, then check local fertilizer rules.
1 · Decide timing and seed
Florida seed and timing guide
Confirm a viable warm-season establishment window before comparing Bermuda, zoysia, centipede, and other Florida options.
Do not apply now. Revisit this only after the state guide confirms an active seeding window, then check the soil test, label, and county fertilizer rules.
The spreaders, controllers, seed, and tools that show up most often in the Florida calendar above — built around the green-up push after the last frost — spreaders, irrigation timing, and warm-season seed do the heavy lifting once the lawn wakes up.
Feed in spring (April-May) and fall (October), but NOT during the summer. Most Florida counties legally ban nitrogen and phosphorus fertilizer during the rainy season — commonly June 1 through September 30 — to protect waterways and springs. The exact dates vary by county, so check your local ordinance. The summer blackout is the single biggest difference between Florida's calendar and a Northern one.
What's killing my St. Augustine grass in brown patches?
In sunny, dry areas during the May-September heat, the prime suspect is chinch bugs — they cause expanding yellow-then-brown patches that look like drought but won't respond to watering. Part the grass at the edge of a spreading patch and look for small black-and-white insects. In cool, wet fall weather, expanding circular patches are more likely large patch fungus instead.
How short should I cut St. Augustine grass in Florida?
Keep it tall — 3.5 to 4 inches — year round, and never remove more than a third of the blade in one mowing. St. Augustine is a high-cut grass; mowing it short stresses it, opens it to weeds, and worsens chinch bug and disease damage. Keep the blade sharp, since torn blades invite disease in Florida's humidity.
Should I water my Florida lawn in the summer?
Often less than you'd think. During the rainy season's daily afternoon storms, turn irrigation off or way down — constant wet soil breeds gray leaf spot and root rot. Many districts also enforce year-round watering-day limits. A smart controller with a rain skip prevents both overwatering and ordinance violations.
Compare similar calendar patterns
Florida is in the warm-season south group. These states follow similar seasonal logic, though local soil, elevation, and weather still matter.