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

Mosquito months in Palm Beach County

In a normal year mosquito season in Palm Beach County, FL starts around January 25 and ends around January 22, 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 Palm Beach County, and when

• Start tipping out standing water weekly by January 11.
• Book any yard treatment for late January, ahead of the August peak.
• Repellent can go away after January 22.
• 5 West Nile cases since 2016 (last 2020): you should use repellent at dusk April to November, more so if over 60.

Palm Beach County against the rest of FL

Palm Beach County has the 17th longest season of 67 FL counties, at 362 days against 365 in Broward County and 281 in Gilchrist County. Its mean temperature is 74.3°F.

• Seminole County: January 14 to January 11 (362 days, 1 WNV)
• Flagler County: January 19 to January 16 (362 days, 0 WNV)
• Osceola County: January 14 to January 10 (361 days, 0 WNV)
• Lake County: January 17 to January 13 (361 days, 1 WNV)

West Nile in Palm Beach County

From 1999 to 2025, CDC ArboNET counted 11 human West Nile cases in Palm Beach County (9 neuroinvasive) across 5 years. The worst was 2020 with 5; the latest was 2020.

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