Tampa Fertilizer Rules: The Summer Nitrogen Ban (June 1 to Sept 30)

When is fertilizer banned in Tampa?

From June 1 through September 30 every year, Tampa-area homeowners and lawn services may not apply fertilizer containing nitrogen (N) or phosphorus (P) to lawns and landscapes. This summer “blackout” exists because the heavy rainy-season storms wash unused nutrients off lawns, through storm drains, and into Tampa Bay, where they fuel algae blooms and harm seagrass. The ban is in force across the major Tampa Bay counties — Hillsborough (which includes the City of Tampa), Pinellas, Manatee, and Sarasota — though the exact wording can vary slightly by jurisdiction, so check your own county’s ordinance.

Period	N & P fertilizer?	Notes
Oct–May	Allowed	Use slow-release N; apply only to an actively growing lawn
June 1–Sept 30	Banned	No N or P; iron-only products allowed for color

Source: Hillsborough County / Tampa Bay regional ordinance; UF/IFAS. Updated 2026-06-16.

When should I fertilize my Tampa lawn instead?

Fertilize in spring and fall, outside the June 1–September 30 ban. The first feeding should wait until the lawn is fully green and growing, usually April after the last cool spell; a second application fits in October or November once the ban lifts and the grass is still active. Use a slow-release nitrogen product so the lawn is fed steadily rather than flushed with a surge that runs off. Because Florida soils are typically high in phosphorus, most Tampa lawns need little or no added P — a UF/IFAS soil test tells you for sure. Spreading two well-timed feedings around the summer ban gives a healthier lawn than over-feeding ever would.

Source: UF/IFAS Florida-Friendly Landscaping. Updated 2026-06-16.

What are Hillsborough County’s extra fertilizer rules?

Beyond the summer ban, Hillsborough County (and the City of Tampa within it) adds protections around water and timing. The county’s Environmental Protection Commission rules direct that fertilizer not be applied when heavy rain is forecast, since storms drive runoff, and that products applied the rest of the year contain a high percentage of slow-release nitrogen. Neighboring Pinellas County requires a fertilizer-free buffer (commonly 10 feet) along seawalls, ponds, and waterways and discourages phosphorus without a soil test. Keep granules off driveways and sidewalks and sweep any stray product back onto the lawn, because anything left on pavement washes straight to the bay. For the precise current numbers, confirm your county’s ordinance.

Source: Hillsborough County EPC; Pinellas County; UF/IFAS. Updated 2026-06-16.

Can I make my lawn greener during the Tampa summer ban?

Yes — with iron, not nitrogen. During the June–September ban you may not apply N or P, but a chelated iron or iron-sulfate product greens up the lawn without feeding growth or breaking the ordinance. Iron deepens color, while the banned nitrogen is what pushes the flush of growth (and runoff) the rule is designed to prevent. Pair iron with sound summer habits — mowing tall, sharp blades, watering only as the restrictions allow, and scouting for chinch bugs and fungus — and a Tampa lawn can look strong all summer without any banned fertilizer.

Source: UF/IFAS. Updated 2026-06-16.

What is the right way to fertilize a Tampa lawn?

Follow the UF/IFAS Florida-Friendly Landscaping approach: fertilize lightly, at the right time, with the right product. That means feeding only outside the summer ban, choosing a slow-release nitrogen source, skipping phosphorus unless a soil test calls for it, keeping a buffer near any water, never applying before a storm, and cleaning product off hard surfaces. Over-fertilizing a Tampa lawn does not make it greener — it drives disease, thatch, pest problems, and pollution. Less, well-timed, is the standard here, and it also keeps you on the right side of the regional ordinance.

Source: UF/IFAS Florida-Friendly Landscaping. Updated 2026-06-16.

Frequently asked questions about Tampa fertilizer rules

When is fertilizer banned in Tampa? June 1 through September 30, when nitrogen and phosphorus lawn fertilizer may not be applied across the Tampa Bay counties to protect the bay from rainy-season runoff.

Is the Tampa fertilizer ban a SWFWMD rule? No. It is a county and regional ordinance backed by UF/IFAS guidance. SWFWMD handles water restrictions, while the fertilizer ban comes from local government.

When can I fertilize my lawn in Tampa? In spring once the lawn is green and growing (around April) and again in fall after the ban lifts (October or November), using slow-release nitrogen.

Can I make my lawn green in summer without fertilizer? Yes. A chelated iron product adds color without nitrogen or phosphorus, so it greens the lawn without breaking the summer ban.

Do Tampa lawns need phosphorus fertilizer? Usually not. Florida soils are often already high in phosphorus, so most lawns need little or none. A UF/IFAS soil test confirms whether you need any.

What are the rules near water in the Tampa area? Several counties require a fertilizer-free buffer (commonly about 10 feet) along seawalls, ponds, and waterways, and prohibit applying fertilizer when heavy rain is forecast.