Mosquito season in Windham County, VT: when it starts and ends
Mosquito months in Windham County
In a normal year mosquito season in Windham County, VT starts around May 6 and ends around October 7, about 22 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Windham County, and when
- Start tipping out standing water weekly by April 22.
- Book any yard treatment for early May, ahead of the July peak.
- Repellent can go away after October 7.
- No West Nile cases since 2016, so bites in Windham County are a nuisance; check window screens.
Windham County against the rest of VT
Windham County has the 9th longest season of 14 VT counties, at 154 days against 171 in Chittenden County and 144 in Orleans County. Its mean temperature is 43.9°F.
- Caledonia County: May 4 to October 6 (155 days, 0 WNV)
- Bennington County: May 6 to October 7 (154 days, 1 WNV)
- Washington County: May 5 to October 6 (153 days, 0 WNV)
- Lamoille County: May 9 to October 3 (147 days, 0 WNV)
West Nile in Windham County
From 1999 to 2025, CDC ArboNET counted 1 human West Nile case in Windham County (0 neuroinvasive) across 1 year. The worst was 2003 with 1; the latest was 2003.
Background: when mosquitoes go away for the winter; how the dates are worked out.