Mosquito season in Somerset County, ME: when it starts and ends
Mosquito months in Somerset County
In a normal year mosquito season in Somerset County, ME starts around May 15 and ends around September 29, about 20 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Somerset County, and when
- Start tipping out standing water weekly by May 1.
- Book any yard treatment for mid May, ahead of the July peak.
- Repellent can go away after September 29.
- No West Nile cases since 2016, so bites in Somerset County are a nuisance; check window screens.
Somerset County against the rest of ME
Somerset County has the 15th longest season of 16 ME counties, at 138 days against 164 in Kennebec County and 133 in Franklin County. Its mean temperature is 39.6°F.
- Aroostook County: May 11 to October 1 (142 days, 0 WNV)
- Piscataquis County: May 14 to September 30 (139 days, 0 WNV)
- Franklin County: May 17 to September 27 (133 days, 0 WNV)
West Nile in Somerset County
CDC ArboNET lists no human West Nile cases for Somerset County from 1999 to 2025, though virus turned up in birds, mosquitoes or horses in 3 of those years.
More: how the dates are worked out · when mosquitoes go away for the winter.