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

Mosquito months in Hernando County

In a normal year mosquito season in Hernando County, FL starts around January 24 and ends around January 9, about 50 weeks.

What to do in Hernando County, and when

Start tipping out standing water weekly by January 10.
Book any yard treatment for late January, ahead of the August peak.
Repellent can go away after January 9.
No West Nile cases since 2016, so bites in Hernando County are a nuisance; check window screens.

Hernando County against the rest of FL

Hernando County has the 28th longest season of 67 FL counties, at 350 days against 365 in Broward County and 281 in Gilchrist County. Its mean temperature is 72.1°F.

Okeechobee County: January 22 to January 13 (356 days, 1 WNV)
Hardee County: January 28 to January 15 (352 days, 0 WNV)
St. Johns County: January 25 to January 10 (350 days, 2 WNV)
DeSoto County: January 28 to January 11 (348 days, 0 WNV)

West Nile in Hernando County

CDC ArboNET lists no human West Nile cases for Hernando County from 1999 to 2025, though virus turned up in birds, mosquitoes or horses in 16 of those years.

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