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

Mosquito months in Alachua County

In a normal year mosquito season in Alachua County, FL starts around February 12 and ends around December 25, about 45 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 Alachua County, and when

• Start tipping out standing water weekly by January 29.
• Book any yard treatment for mid February, ahead of the July peak.
• Repellent can go away after December 25.
• No West Nile cases since 2016, so bites in Alachua County are a nuisance; check window screens.

Alachua County against the rest of FL

Alachua County has the 50th longest season of 67 FL counties, at 316 days against 365 in Broward County and 281 in Gilchrist County. Its mean temperature is 69.3°F.

• Holmes County: February 24 to January 11 (321 days, 0 WNV)
• Jackson County: February 9 to December 22 (316 days, 0 WNV)
• Santa Rosa County: February 13 to December 24 (314 days, 4 WNV)
• Walton County: February 12 to December 16 (307 days, 1 WNV)

West Nile in Alachua County

From 1999 to 2025, CDC ArboNET counted 4 human West Nile cases in Alachua County (3 neuroinvasive) across 4 years. The worst was 2014 with 1; the latest was 2014.

See how the dates are worked out, and when the season starts across the US.