Mosquito season in Essex County, VT: when it starts and ends
Mosquito months in Essex County
In a normal year mosquito season in Essex 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 Essex 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 Essex County are a nuisance; check window screens.
Essex County against the rest of VT
Essex County has the 13th longest season of 14 VT counties, at 144 days against 171 in Chittenden County and 144 in Orleans County. Its mean temperature is 40.5°F.
- Lamoille County: May 9 to October 3 (147 days, 0 WNV)
- Orange County: May 9 to October 2 (146 days, 0 WNV)
- Orleans County: May 10 to October 1 (144 days, 0 WNV)
West Nile in Essex County
From 1999 to 2025, CDC ArboNET counted 1 human West Nile case in Essex County (0 neuroinvasive) across 1 year. The worst was 2012 with 1; the latest was 2012.
See how the dates are worked out, and when mosquitoes go away for the winter.