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

Mosquito months in Orange County

Mosquitoes in Orange County, FL can be active in any month. The worst stretch is April to October.

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 Orange County, and when

• No off-season here: tip out standing water every week, all year.
• A yard treatment matters most April to October.
• No West Nile cases since 2016, so bites in Orange County are a nuisance; check window screens.

Orange County against the rest of FL

Orange County has the 11th 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.

• Miami-Dade County: all year (365 days, 29 WNV)
• Monroe County: all year (365 days, 0 WNV)
• Pinellas County: all year (365 days, 1 WNV)
• Polk County: all year (365 days, 0 WNV)

West Nile in Orange County

From 1999 to 2025, CDC ArboNET counted 4 human West Nile cases in Orange County (4 neuroinvasive) across 3 years. The worst was 2010 with 2; the latest was 2012.

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