Mosquito season in Sagadahoc County, ME: when it starts and ends

Mosquito months in Sagadahoc County

In a normal year mosquito season in Sagadahoc County, ME starts around May 8 and ends around October 11, about 22 weeks.

1. Jan
2. Feb
3. Mar
4. Apr
5. May
6. Jun
7. Jul
8. Aug
9. Sep
10. Oct
11. Nov
12. Dec

What to do in Sagadahoc County, and when

• Start tipping out standing water weekly by April 24.
• Book any yard treatment for early May, ahead of the July peak.
• Repellent can go away after October 11.
• No West Nile cases since 2016, so bites in Sagadahoc County are a nuisance; check window screens.

Sagadahoc County against the rest of ME

Sagadahoc County has the 8th longest season of 16 ME counties, at 156 days against 164 in Kennebec County and 133 in Franklin County. Its mean temperature is 45°F.

• Washington County: May 6 to October 11 (158 days, 0 WNV)
• York County: May 3 to October 7 (157 days, 0 WNV)
• Hancock County: May 7 to October 10 (155 days, 1 WNV)
• Waldo County: May 8 to October 10 (155 days, 1 WNV)

West Nile in Sagadahoc County

CDC ArboNET lists no human West Nile cases for Sagadahoc County from 1999 to 2025, though virus turned up in birds, mosquitoes or horses in 2 of those years.

More: how the dates are worked out · when the season starts across the US.