Mosquito season in Orleans County, VT: when it starts and ends
Mosquito months in Orleans County
In a normal year mosquito season in Orleans County, VT starts around May 10 and ends around October 1, about 21 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Orleans County, and when
- Start tipping out standing water weekly by April 26.
- Book any yard treatment for early May, ahead of the July peak.
- Repellent can go away after October 1.
- No West Nile cases since 2016, so bites in Orleans County are a nuisance; check window screens.
Orleans County against the rest of VT
Orleans County has the 14th longest season of 14 VT counties, at 144 days against 171 in Chittenden County and 144 in Orleans County. Its mean temperature is 40.8°F.
- Orange County: May 9 to October 2 (146 days, 0 WNV)
- Essex County: May 10 to October 1 (144 days, 0 WNV)
West Nile in Orleans County
CDC ArboNET lists no human West Nile cases for Orleans County from 1999 to 2025, though virus turned up in birds, mosquitoes or horses in 10 of those years.
Background: when mosquitoes go away for the winter; how the dates are worked out.