When should I fertilize my lawn in Florida?
In Florida, fertilize your lawn in spring after the grass greens up — usually around April in Central Florida, once nighttime temperatures stay warm — then feed it through the active growing season into fall. The catch that trips up newcomers: many Central Florida counties ban summer fertilizer during the rainy season to protect waterways, so the calendar isn't as simple as "feed all summer." Get the timing right and you grow a thick, healthy lawn; get it wrong and you waste money, burn the grass, or run afoul of a local ordinance.
Key takeaways
- Start fertilizing in spring after green-up (about April in Central Florida), not while grass is dormant.
- Feed during active growth — warm-season lawns need feeding two to four times across the season.
- Many counties ban nitrogen/phosphorus fertilizer in summer (often June 1–Sept 30) — check your local rule.
- Apply by the UF/IFAS rate for your grass (e.g., ~2–4 lbs N/1,000 sq ft/year for St. Augustine), not by eye.
- Use slow-release nitrogen and, in most areas, a zero-phosphorus blend unless a soil test says otherwise.
Table of contents
- The Florida fertilizer calendar
- Why spring green-up is the starting gun
- The summer fertilizer ban
- How much your lawn actually needs
- Choosing the right fertilizer
- Watering, mowing, and green-up without nitrogen
- Common mistakes to avoid
- Where to start
- FAQ
The Florida fertilizer calendar
Florida lawns are warm-season grasses — St. Augustine, Bahia, Zoysia, Bermuda — that grow when it's warm and slow down when it's cool. That makes the calendar look very different from up north. Here's a general Central Florida schedule, with the critical note that your county may restrict summer applications:
| Season | Timing | What to do |
|---|---|---|
| Late winter | Feb–Mar | Hold off — grass isn't actively growing yet |
| Spring | Apr (after green-up) | First feeding of the year |
| Early summer | May | Optional feeding before any local ban starts |
| Peak summer | Jun–Sep | Often a fertilizer blackout — check your ordinance |
| Fall | Oct | Final feeding before cool-down |
| Winter | Nov–Jan | Don't fertilize; grass is slowing or dormant |
This is a guideline, not a guarantee — your grass type, the year's weather, and your local rules all shift it. The University of Florida's UF/IFAS lawn fertilization guidance is the authoritative, grass-by-grass reference.
Why spring green-up is the starting gun
The single best timing rule is to wait for the grass to green up and start actively growing before the first feeding. Fertilizer is food for a growing plant; applying it while the lawn is still cool-weather dormant means the grass can't use it, so it either washes away or sits there doing nothing. In Central Florida, green-up usually lands around April, once nights are reliably warm. A useful tell: when you're mowing regularly again because the grass is actually growing, it's ready to be fed. Feeding too early is one of the most common — and most wasteful — lawn mistakes here.
The summer fertilizer ban
This is the Florida-specific rule that surprises people. Across Central Florida, many counties and cities restrict or prohibit nitrogen and phosphorus fertilizer during the summer rainy season — commonly June 1 through September 30 — because heavy summer storms wash fertilizer off lawns and into lakes, rivers, and springs, where it fuels algae blooms.
It varies by jurisdiction
Orange County, Pinellas County, and many municipalities have such ordinances, and the specific dates and rules vary by jurisdiction — some restrict only certain nutrients, some require a percentage of slow-release nitrogen year-round, and most prohibit applying before heavy rain. The takeaway: check your county or city ordinance before you fertilize in summer. The Florida Department of Agriculture and Consumer Services oversees the state's urban turf fertilizer rule, and UF/IFAS notes these local "blackout" ordinances are common in the region. This is also why a reputable lawn care company will schedule around the ban rather than feeding straight through summer — if a service wants to fertilize your lawn in July without mentioning local rules, ask why.
How much your lawn actually needs
Most warm-season Florida lawns need feeding two to four times across the growing season — not monthly, and not "more is better." The amount matters as much as the timing, and UF/IFAS sets it by pounds of nitrogen per 1,000 square feet per year, split across applications. As a rough guide for Central Florida:
| Grass | Typical annual nitrogen (lbs N/1,000 sq ft) |
|---|---|
| St. Augustine | ~2–4 |
| Zoysia | ~2–4 |
| Bahia | ~2–3 |
| Bermuda | ~3–5 |
| Centipede | ~1–2 |
Check the UF/IFAS figure for your exact grass and region rather than guessing — and never apply more than about 1 pound of nitrogen per 1,000 square feet in a single application. Over-fertilizing is genuinely harmful: it pushes soft growth that pests like chinch bugs love, increases disease, and runs off into waterways. Our St. Augustine grass care guide covers the full maintenance picture for the most common Central Florida grass.
Choosing the right fertilizer
Match the product to your grass and your local rules:
- Slow-release nitrogen — look for a product where a good share of the nitrogen is slow- or controlled-release. It feeds steadily, reduces runoff, and lets you feed less often. Many ordinances actually require a minimum slow-release percentage.
- Often zero phosphorus — many Florida ordinances limit phosphorus unless a soil test shows your lawn needs it, so a "zero middle number" blend is frequently required. A cheap soil test through your county extension office tells you what you actually need.
- Match the grass — St. Augustine, Bahia, and Zoysia have different needs; our best grass for Florida guide covers the differences if you're choosing or re-sodding.
When in doubt, the county extension office (UF/IFAS) will tell you the right product and rate for your exact grass and soil — for free.
Watering, mowing, and green-up without nitrogen
Fertilizer is only part of a healthy lawn, and leaning on it to fix everything backfires. Watering matters: most Central Florida counties have year-round watering-day restrictions, and deep, infrequent watering builds better roots than daily sprinkling. Mowing height matters too — St. Augustine kept taller (around 3.5–4 inches) shades out weeds and resists stress better than a scalped lawn. And here's a useful trick: if your lawn just looks pale or yellow but is otherwise healthy, the answer is often iron, not nitrogen. A chelated-iron or iron-sulfate application greens the grass up without forcing the growth (and the mowing, and the runoff) that extra nitrogen causes — and it's allowed during many summer nitrogen bans. Yellowing can also signal a manganese or magnesium shortfall, which a soil test will reveal. Our Orlando lawn care guide ties these practices together.
Common mistakes to avoid
A few errors account for most lawn problems here:
- Fertilizing too early, before spring green-up, wastes product.
- Fertilizing during the summer ban can violate a local ordinance and pollute waterways.
- Over-applying burns the lawn and invites pests — stick to the rate.
- Fertilizing dormant winter grass does nothing useful.
- Getting fertilizer on driveways or sidewalks sends it straight to the storm drain — always sweep stray granules back onto the lawn.
Avoiding these five is most of the battle. If you're laying new grass, time it with the season too; our sod installation cost guide covers establishment.
Where to start
Start by identifying your grass type and looking up your county's fertilizer ordinance — those two facts set your whole schedule. Then wait for spring green-up, feed at the UF/IFAS rate with a slow-release, low-or-no-phosphorus product, and skip the summer blackout window (using iron for color if needed). If you'd rather hand it off, our lawn care directory and Orlando city page list local companies, with more across the full directory — just confirm they schedule around the local ban.
FAQ
When should I fertilize my lawn in Florida? Start in spring after the grass greens up and nighttime temperatures stay warm — usually April in Central Florida — then feed during active growth through fall. Don't fertilize dormant winter grass, and check your county's summer rules first.
Is there a summer fertilizer ban in Florida? Many Central Florida counties and cities restrict or ban nitrogen and phosphorus fertilizer during the summer rainy season, often June 1 through September 30, to protect waterways. Check your local ordinance before applying.
How often should I fertilize Florida grass? Most warm-season Florida lawns need feeding two to four times during the growing season, depending on the grass and product. Slow-release nitrogen lets you feed less often and reduces runoff.
How much fertilizer does my lawn need? UF/IFAS sets nitrogen rates by grass and region — for example, St. Augustine in Central Florida is often around 2–4 pounds of nitrogen per 1,000 square feet per year, split across applications. Apply by the rate, not by eye.
Should I fertilize my lawn in winter in Florida? Generally no. Warm-season grasses like St. Augustine and Bahia slow or go dormant in cooler months, so fertilizing then wastes product and can harm the lawn. Resume in spring.
What fertilizer is best for Florida lawns? Use a product matched to your grass with a slow-release nitrogen source, and follow UF/IFAS rate recommendations. Many areas restrict phosphorus, so a zero-phosphorus blend is often required unless a soil test shows a need.