Mosquito season in Monroe County, FL: when it starts and ends
Mosquito months in Monroe County
Mosquitoes in Monroe County, FL can be active in any month. The worst stretch is March to November.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Monroe County, and when
- No off-season here: tip out standing water every week, all year.
- A yard treatment matters most March to November.
- No West Nile cases since 2016, so bites in Monroe County are a nuisance; check window screens.
Monroe County against the rest of FL
Monroe County has the 10th longest season of 67 FL counties, at 365 days against 365 in Broward County and 281 in Gilchrist County. Its mean temperature is 76.6°F.
- Martin County: all year (365 days, 2 WNV)
- Miami-Dade County: all year (365 days, 29 WNV)
- Orange County: all year (365 days, 0 WNV)
- Pinellas County: all year (365 days, 1 WNV)
West Nile in Monroe County
From 1999 to 2025, CDC ArboNET counted 4 human West Nile cases in Monroe County (4 neuroinvasive) across 3 years. The worst was 2001 with 2; the latest was 2014.
More: how the dates are worked out · where mosquitoes never stop.