Mosquito season in Indian River County, FL: when it starts and ends
Mosquito months in Indian River County
Mosquitoes in Indian River County, FL can be active in any month. The worst stretch is April to November.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Indian River County, and when
- No off-season here: tip out standing water every week, all year.
- A yard treatment matters most April to November.
- No West Nile cases since 2016, so bites in Indian River County are a nuisance; check window screens.
Indian River County against the rest of FL
Indian River County has the 5th longest season of 67 FL counties, at 365 days against 365 in Broward County and 281 in Gilchrist County. Its mean temperature is 73.7°F.
- Collier County: all year (365 days, 11 WNV)
- Hillsborough County: all year (365 days, 2 WNV)
- Lee County: all year (365 days, 1 WNV)
- Manatee County: all year (365 days, 1 WNV)
West Nile in Indian River County
CDC ArboNET lists no human West Nile cases for Indian River County from 1999 to 2025, though virus turned up in birds, mosquitoes or horses in 20 of those years.
More: how the dates are worked out · where mosquitoes never stop.