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

Mosquito months in Bay County

In a normal year mosquito season in Bay County, FL starts around January 23 and ends around January 5, about 50 weeks.

What to do in Bay County, and when

Start tipping out standing water weekly by January 9.
Book any yard treatment for late January, ahead of the July peak.
Repellent can go away after January 5.
10 West Nile cases since 2016: you should wear EPA-registered repellent at dusk May to October, and check FL spray notices.

Bay County against the rest of FL

Bay County has the 31st longest season of 67 FL counties, at 347 days against 365 in Broward County and 281 in Gilchrist County. Its mean temperature is 69.3°F.

St. Johns County: January 25 to January 10 (350 days, 2 WNV)
DeSoto County: January 28 to January 11 (348 days, 0 WNV)
Bradford County: January 23 to January 4 (346 days, 0 WNV)
Clay County: January 23 to January 4 (346 days, 3 WNV)

West Nile in Bay County

From 1999 to 2025, CDC ArboNET counted 27 human West Nile cases in Bay County (20 neuroinvasive) across 7 years. The worst was 2003 with 14; the latest was 2024.

See how the dates are worked out, and where mosquitoes never stop.