Lawn Care in Florida Winter: What St. Pete Homeowners Need to Know

Florida winter is nothing like winter in most of the country — but your lawn does change behavior between December and February. Here is how to adjust your care routine for the St. Petersburg climate during the cool months.

Your Lawn Is Growing — Just Slowly

St. Augustine grass slows down significantly when soil temperatures drop below 60°F. In St. Pete, this typically means November through February sees much slower growth than the peak summer months. The lawn does not go fully dormant the way it does in north Florida — it just slows. Some winters, the lawn barely needs mowing in January. Other warmer winters, you may still need a trim every two to three weeks.

Mowing in Winter

Do not scalp your lawn going into winter. Leaving St. Augustine at 3.5–4 inches helps protect the roots and stolons from cold snaps. Shorter grass is more vulnerable to freeze damage.

Reduce mowing frequency as growth slows. Monthly service is often sufficient by January in most St. Pete winters.

Watering in Winter

Dramatically reduce irrigation during winter. A dormant or slow-growing lawn uses far less water. Most St. Pete winters, natural rainfall handles it. Check soil moisture before running irrigation — if the top inch of soil is still moist, skip the cycle. If a cold front is coming, watering the day before can help — moist soil retains heat better than dry soil.

Do Not Fertilize

Applying nitrogen fertilizer in winter is counterproductive. The lawn cannot efficiently use nutrients when growing slowly, and pushing new growth in December creates soft, tender blades that are highly vulnerable to the next cold front. Hold off on any nitrogen until April, when the lawn is actively growing again and temperatures have stabilized.

Weed Control Opportunity

Cool-season weeds actually germinate and grow more actively in Florida's mild winters when the grass is not competing as hard. Winter is a good time to spot-treat weeds and apply pre-emergent if you had heavy weed pressure the previous year. Consult a licensed professional for any herbicide applications on your specific grass type.

What to Do in Late Winter (February–March)

• Assess winter damage — areas that did not green up may need repair in spring
• Service your mower — sharpen blades, change oil, check belts before growing season
• Test your irrigation system before you need it — spring dry season arrives in March
• Plan spring fertilization for April once growth is steady