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

Mosquito months in Collier County

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

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 Collier County, and when

• No off-season here: tip out standing water every week, all year.
• A yard treatment matters most April to November.
• 11 West Nile cases since 2016: you should wear EPA-registered repellent at dusk April to November, and check FL spray notices.

Collier County against the rest of FL

Collier County has the 3rd longest season of 67 FL counties, at 365 days against 365 in Broward County and 281 in Gilchrist County. Its mean temperature is 75.1°F.

• Broward County: all year (365 days, 6 WNV)
• Charlotte County: all year (365 days, 2 WNV)
• Hillsborough County: all year (365 days, 2 WNV)
• Indian River County: all year (365 days, 0 WNV)

West Nile in Collier County

From 1999 to 2025, CDC ArboNET counted 15 human West Nile cases in Collier County (15 neuroinvasive) across 4 years. The worst was 2020 with 7; the latest was 2021.

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