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

Mosquito months in Oxford County

In a normal year mosquito season in Oxford County, ME starts around May 8 and ends around October 4, about 21 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 Oxford 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 4.
• No West Nile cases since 2016, so bites in Oxford County are a nuisance; check window screens.

Oxford County against the rest of ME

Oxford County has the 12th longest season of 16 ME counties, at 149 days against 164 in Kennebec County and 133 in Franklin County. Its mean temperature is 42.6°F.

• Waldo County: May 8 to October 10 (155 days, 1 WNV)
• Penobscot County: May 8 to October 5 (150 days, 0 WNV)
• Aroostook County: May 11 to October 1 (142 days, 0 WNV)
• Piscataquis County: May 14 to September 30 (139 days, 0 WNV)

West Nile in Oxford County

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

Background: when mosquitoes go away for the winter; how the dates are worked out.