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

Mosquito months in Flagler County

In a normal year mosquito season in Flagler County, FL starts around January 19 and ends around January 16, about 52 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 Flagler County, and when

• Start tipping out standing water weekly by January 5.
• Book any yard treatment for mid January, ahead of the August peak.
• Repellent can go away after January 16.
• No West Nile cases since 2016, so bites in Flagler County are a nuisance; check window screens.

Flagler County against the rest of FL

Flagler County has the 16th longest season of 67 FL counties, at 362 days against 365 in Broward County and 281 in Gilchrist County. Its mean temperature is 71.1°F.

• St. Lucie County: all year (365 days, 0 WNV)
• Seminole County: January 14 to January 11 (362 days, 1 WNV)
• Palm Beach County: January 25 to January 22 (362 days, 5 WNV)
• Osceola County: January 14 to January 10 (361 days, 0 WNV)

West Nile in Flagler County

CDC ArboNET lists no human West Nile cases for Flagler County from 1999 to 2025, though virus turned up in birds, mosquitoes or horses in 10 of those years.

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