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

Mosquito months in Pinellas County

Mosquitoes in Pinellas 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 Pinellas County, and when

• No off-season here: tip out standing water every week, all year.
• A yard treatment matters most April to October.
• 1 West Nile case since 2016 (last 2024): you should use repellent at dusk April to October, more so if over 60.

Pinellas County against the rest of FL

Pinellas County has the 12th longest season of 67 FL counties, at 365 days against 365 in Broward County and 281 in Gilchrist County. Its mean temperature is 74.1°F.

• Monroe County: all year (365 days, 0 WNV)
• Orange County: all year (365 days, 0 WNV)
• Polk County: all year (365 days, 0 WNV)
• St. Lucie County: all year (365 days, 0 WNV)

West Nile in Pinellas County

From 1999 to 2025, CDC ArboNET counted 21 human West Nile cases in Pinellas County (10 neuroinvasive) across 4 years. The worst was 2005 with 18; the latest was 2024.

More: how the dates are worked out · where mosquitoes never stop.