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

Mosquito months in Putnam County

In a normal year mosquito season in Putnam County, FL starts around January 21 and ends around January 12, about 51 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 Putnam County, and when

• Start tipping out standing water weekly by January 7.
• Book any yard treatment for late January, ahead of the July peak.
• Repellent can go away after January 12.
• 2 West Nile cases since 2016 (last 2025): you should use repellent at dusk May to October, more so if over 60.

Putnam County against the rest of FL

Putnam County has the 25th longest season of 67 FL counties, at 356 days against 365 in Broward County and 281 in Gilchrist County. Its mean temperature is 70°F.

• Hendry County: January 20 to January 14 (359 days, 0 WNV)
• Duval County: January 22 to January 14 (357 days, 20 WNV)
• Okeechobee County: January 22 to January 13 (356 days, 1 WNV)
• Hardee County: January 28 to January 15 (352 days, 0 WNV)

West Nile in Putnam County

From 1999 to 2025, CDC ArboNET counted 3 human West Nile cases in Putnam County (2 neuroinvasive) across 3 years. The worst was 2025 with 1; the latest was 2025.

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