Mosquito season in Orange County, VT: when it starts and ends
Mosquito months in Orange County
In a normal year mosquito season in Orange County, VT starts around May 9 and ends around October 2, about 21 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Orange County, and when
- Start tipping out standing water weekly by April 25.
- Book any yard treatment for early May, ahead of the July peak.
- Repellent can go away after October 2.
- No West Nile cases since 2016, so bites in Orange County are a nuisance; check window screens.
Orange County against the rest of VT
Orange County has the 12th longest season of 14 VT counties, at 146 days against 171 in Chittenden County and 144 in Orleans County. Its mean temperature is 41.8°F.
- Washington County: May 5 to October 6 (153 days, 0 WNV)
- Lamoille County: May 9 to October 3 (147 days, 0 WNV)
- Essex County: May 10 to October 1 (144 days, 0 WNV)
- Orleans County: May 10 to October 1 (144 days, 0 WNV)
West Nile in Orange County
CDC ArboNET lists no human West Nile cases for Orange County from 1999 to 2025, though virus turned up in birds, mosquitoes or horses in 6 of those years.
See how the dates are worked out, and when mosquitoes go away for the winter.