Mosquito season in Washington County, VT: when it starts and ends
Mosquito months in Washington County
In a normal year mosquito season in Washington County, VT starts around May 5 and ends around October 6, about 22 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Washington County, and when
- Start tipping out standing water weekly by April 21.
- Book any yard treatment for early May, ahead of the July peak.
- Repellent can go away after October 6.
- No West Nile cases since 2016, so bites in Washington County are a nuisance; check window screens.
Washington County against the rest of VT
Washington County has the 10th longest season of 14 VT counties, at 153 days against 171 in Chittenden County and 144 in Orleans County. Its mean temperature is 43.3°F.
- Bennington County: May 6 to October 7 (154 days, 1 WNV)
- Windham County: May 6 to October 7 (154 days, 0 WNV)
- Lamoille County: May 9 to October 3 (147 days, 0 WNV)
- Orange County: May 9 to October 2 (146 days, 0 WNV)
West Nile in Washington County
CDC ArboNET lists no human West Nile cases for Washington County from 1999 to 2025, though virus turned up in birds, mosquitoes or horses in 7 of those years.
More: how the dates are worked out · when mosquitoes go away for the winter.