Mosquito season in Franklin County, VT: when it starts and ends
Mosquito months in Franklin County
In a normal year mosquito season in Franklin County, VT starts around May 4 and ends around October 10, about 23 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Franklin 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 10.
- No West Nile cases since 2016, so bites in Franklin County are a nuisance; check window screens.
Franklin County against the rest of VT
Franklin County has the 4th longest season of 14 VT counties, at 159 days against 171 in Chittenden County and 144 in Orleans County. Its mean temperature is 44.4°F.
- Grand Isle County: April 27 to October 15 (171 days, 2 WNV)
- Addison County: April 30 to October 11 (164 days, 1 WNV)
- Windsor County: May 3 to October 8 (158 days, 2 WNV)
- Rutland County: May 2 to October 5 (156 days, 0 WNV)
West Nile in Franklin County
From 1999 to 2025, CDC ArboNET counted 2 human West Nile cases in Franklin County (1 neuroinvasive) across 2 years. The worst was 2012 with 1; the latest was 2012.
More: how the dates are worked out · when the season starts across the US.