Mosquito season in Leon County, FL: when it starts and ends

Mosquito months in Leon County

In a normal year mosquito season in Leon County, FL starts around February 25 and ends around December 6, about 41 weeks.

1. Jan
2. Feb
3. Mar
4. Apr
5. May
6. Jun
7. Jul
8. Aug
9. Sep
10. Oct
11. Nov
12. Dec

What to do in Leon County, and when

• Start tipping out standing water weekly by February 11.
• Book any yard treatment for late February, ahead of the July peak.
• Repellent can go away after December 6.
• 3 West Nile cases since 2016 (last 2018): you should use repellent at dusk May to October, more so if over 60.

Leon County against the rest of FL

Leon County has the 65th longest season of 67 FL counties, at 284 days against 365 in Broward County and 281 in Gilchrist County. Its mean temperature is 68.2°F.

• Wakulla County: February 26 to December 11 (288 days, 1 WNV)
• Gadsden County: February 28 to December 10 (285 days, 1 WNV)
• Okaloosa County: February 25 to December 5 (283 days, 2 WNV)
• Gilchrist County: February 28 to December 6 (281 days, 0 WNV)

West Nile in Leon County

From 1999 to 2025, CDC ArboNET counted 10 human West Nile cases in Leon County (9 neuroinvasive) across 6 years. The worst was 2018 with 3; the latest was 2018.

See how the dates are worked out, and when mosquitoes go away for the winter.