Mosquito season in Waldo County, ME: when it starts and ends
Mosquito months in Waldo County
In a normal year mosquito season in Waldo County, ME starts around May 8 and ends around October 10, about 22 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Waldo 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 10.
- 1 West Nile case since 2016 (last 2024): you should use repellent at dusk July, more so if over 60.
Waldo County against the rest of ME
Waldo County has the 10th longest season of 16 ME counties, at 155 days against 164 in Kennebec County and 133 in Franklin County. Its mean temperature is 44.6°F.
- Sagadahoc County: May 8 to October 11 (156 days, 0 WNV)
- Hancock County: May 7 to October 10 (155 days, 1 WNV)
- Penobscot County: May 8 to October 5 (150 days, 0 WNV)
- Oxford County: May 8 to October 4 (149 days, 0 WNV)
West Nile in Waldo County
From 1999 to 2025, CDC ArboNET counted 1 human West Nile case in Waldo County (1 neuroinvasive) across 1 year. The worst was 2024 with 1; the latest was 2024.
Background: when the season starts across the US; how the dates are worked out.