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

Mosquito months in Marion County

In a normal year mosquito season in Marion County, FL starts around February 4 and ends around January 3, about 48 weeks.

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 Marion County, and when

• Start tipping out standing water weekly by January 21.
• Book any yard treatment for early February, ahead of the July peak.
• Repellent can go away after January 3.
• 2 West Nile cases since 2016 (last 2024): you should use repellent at dusk April to October, more so if over 60.

Marion County against the rest of FL

Marion County has the 39th longest season of 67 FL counties, at 333 days against 365 in Broward County and 281 in Gilchrist County. Its mean temperature is 71.2°F.

• Highlands County: February 4 to January 7 (337 days, 0 WNV)
• Escambia County: January 31 to January 2 (336 days, 15 WNV)
• Suwannee County: January 31 to December 29 (332 days, 2 WNV)
• Nassau County: February 4 to January 2 (332 days, 4 WNV)

West Nile in Marion County

From 1999 to 2025, CDC ArboNET counted 11 human West Nile cases in Marion County (10 neuroinvasive) across 7 years. The worst was 2002 with 3; the latest was 2024.

Background: where mosquitoes never stop; how the dates are worked out.