Mosquito season in Hancock County, ME: when it starts and ends
Mosquito months in Hancock County
In a normal year mosquito season in Hancock County, ME starts around May 7 and ends around October 10, about 22 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Hancock County, and when
- Start tipping out standing water weekly by April 23.
- Book any yard treatment for early May, ahead of the July peak.
- Repellent can go away after October 10.
- 1 West Nile case since 2016 (last 2025): you should use repellent at dusk July, more so if over 60.
Hancock County against the rest of ME
Hancock County has the 9th longest season of 16 ME counties, at 155 days against 164 in Kennebec County and 133 in Franklin County. Its mean temperature is 44.8°F.
- York County: May 3 to October 7 (157 days, 0 WNV)
- Sagadahoc County: May 8 to October 11 (156 days, 0 WNV)
- Waldo County: May 8 to October 10 (155 days, 1 WNV)
- Penobscot County: May 8 to October 5 (150 days, 0 WNV)
West Nile in Hancock County
From 1999 to 2025, CDC ArboNET counted 1 human West Nile case in Hancock County (1 neuroinvasive) across 1 year. The worst was 2025 with 1; the latest was 2025.
More: how the dates are worked out · when the season starts across the US.