Mosquito season in Caledonia County, VT: when it starts and ends
Mosquito months in Caledonia County
In a normal year mosquito season in Caledonia County, VT starts around May 4 and ends around October 6, about 22 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Caledonia County, and when
- Start tipping out standing water weekly by April 20.
- 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 Caledonia County are a nuisance; check window screens.
Caledonia County against the rest of VT
Caledonia County has the 7th longest season of 14 VT counties, at 155 days against 171 in Chittenden County and 144 in Orleans County. Its mean temperature is 43.2°F.
- Windsor County: May 3 to October 8 (158 days, 2 WNV)
- Rutland County: May 2 to October 5 (156 days, 0 WNV)
- Bennington County: May 6 to October 7 (154 days, 1 WNV)
- Windham County: May 6 to October 7 (154 days, 0 WNV)
West Nile in Caledonia County
CDC ArboNET lists no human West Nile cases for Caledonia County from 1999 to 2025, though virus turned up in birds, mosquitoes or horses in 6 of those years.
Background: when mosquitoes go away for the winter; how the dates are worked out.