Tampa Lawn Care Calendar: Month by Month on One Watering Day

Last updated: September 2, 2026

The one rule the whole calendar bends around

Tampa lawns are St. Augustine and Bahia country, and the calendar follows the rain. What has changed is that irrigation is limited to one day a week under the District’s Modified Phase III order, with the daytime hours closed. Everything below is written for that constraint rather than around it.

Two things do most of the work on a single watering day:

• Cycle-and-soak. Tampa soils are sandy and take water faster than they hold it. Split the one watering into two shorter runs about an hour apart so it soaks in instead of draining straight through. Same total minutes, considerably more of it retained.
• A working rain sensor. Every automatic system is required to have one. It is also what stops a July thunderstorm turning into a violation-by-timer the following morning.

Low-volume methods are treated more gently than sprinklers. Drip and micro-irrigation for beds, shrubs and trees, and hand watering of anything that is not lawn, are allowed any day outside the prohibited hours. If your landscape leans on established beds and trees rather than wall-to-wall turf, the order barely touches most of it.

Spring, March to May

The tail of the dry season and the hardest stretch to hold a lawn together.

• Mow St. Augustine high, 3.5 to 4 inches. Height is drought tolerance: taller blades shade the soil and drive deeper roots, and on one watering day a week that matters more than it does in a normal year.
• Water deep on your assigned day, using cycle-and-soak rather than one long run.
• Hold off heavy fertilizing until the lawn can actually drink. Feeding a lawn you cannot water is how you buy growth the plant has no water to support.

Summer, June to September

The rainy season carries most of the load once it arrives, and the fertilizer rules close.

• No fertilizer containing nitrogen or phosphorus from June 1 through September 30. That is Hillsborough County’s restricted season, not a guideline, and it covers the entire summer growth window.
• Let the rain sensor do its job. Daily storms often supply more than the assigned day would.
• Watch for chinch bugs in the hot dry gaps between storms. St. Augustine under water stress is exactly what they look for, and a one-day schedule produces more of that stress than usual.
• Keep mower blades sharp. Wet-season growth is fast and a torn blade tip in humidity is an invitation to fungus.

Autumn, October to November

The decision point, and the best repair window of the year.

• The District reviews the order in the autumn — the current Modified Phase III order runs through October 1, 2026 and can be extended, modified or lifted. Confirm the position before assuming the schedule has loosened.
• October 1 is also when the fertilizer restricted season ends, so this is the first legal feeding window since May.
• Do the recovery work here: patch thin areas, top-dress, and fertilize while the soil is still warm enough for the lawn to use it.

If you are planning sod or a renovation, this is the window to aim at — and the establishment allowance on the restrictions page is what governs how you water it in.

Winter, December to February

• Growth slows and water need drops. One deep watering on your assigned day is usually plenty.
• This is the season for design, hardscape and tree work, when the lawn is not competing for attention or water.

Stretching a single watering day further

Three changes do more than any schedule tinkering:

1. High-efficiency nozzles and a tuned system. Matched precipitation across a zone means the whole zone gets its water in the window rather than half of it being over-watered so the dry corner is merely adequate.
2. Move the hardest corners off turf. The strips that never look right on a restricted schedule are usually the ones that were always marginal. Beds on drip can be watered any day.
3. Fix the leaks and the overspray first. On one day a week, every gallon that lands on pavement is a gallon the lawn does not get until next week.

Frequently asked questions

How high should I mow St. Augustine grass in Tampa? 3.5 to 4 inches. Mowing high shades the soil and encourages deeper rooting, which matters more than usual when irrigation is limited to one day a week.

What is cycle-and-soak and why does it matter in Tampa? Splitting a single watering into two shorter runs about an hour apart. Tampa’s sandy soils take water faster than they retain it, so one long run drains past the root zone while two shorter ones soak in.

When can I fertilize a Tampa lawn? Not between June 1 and September 30, when fertilizer containing nitrogen or phosphorus is prohibited. The first legal feeding window after that opens on October 1, while the soil is still warm.

Do I need a rain sensor in Tampa? Yes. Every automatic irrigation system is required to have a working rain sensor, and it is what prevents a timer running the morning after a storm.

When are chinch bugs a problem in Tampa? In the hot, dry gaps between summer storms, when St. Augustine is under water stress. A one-day-a-week schedule produces more of that stress than a normal season.

When is the best time to lay sod in Tampa? Autumn, once the fertilizer restricted season ends on September 30 and the soil is still warm. Check the establishment allowance on the watering restrictions page before installation day rather than after.

Can I water my beds and shrubs on days other than my assigned day? Yes. Drip and micro-irrigation for beds, shrubs and trees, and hand watering of anything that is not lawn, are allowed any day outside the prohibited hours.

When do the current Tampa restrictions end? The Modified Phase III order runs through October 1, 2026 and can be extended, modified or lifted depending on conditions. The current position is on our watering restrictions page.

Sources

• Southwest Florida Water Management District, District Water Restrictions: watermatters.org restrictions
• Hillsborough County fertilizer restricted season and City of Tampa watering days and hours, summarised with sources on our Tampa watering restrictions page

Method note: this page is seasonal lawn-care guidance built around the watering rules; the rules themselves, with their sources and dates, live on the restrictions page and are maintained there. Restrictions change — confirm before setting a controller. Nothing here is a service quote.