Mosquito season in Mecosta County, MI: when it starts and ends
Mosquito months in Mecosta County
In a normal year mosquito season in Mecosta County, MI starts around May 1 and ends around October 9, about 23 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Mecosta County, and when
- Start tipping out standing water weekly by April 17.
- Book any yard treatment for early May, ahead of the July peak.
- Repellent can go away after October 9.
- No West Nile cases since 2016, so bites in Mecosta County are a nuisance; check window screens.
Mecosta County against the rest of MI
Mecosta County has the 45th longest season of 83 MI counties, at 161 days against 189 in Allegan County and 124 in Iron County. Its mean temperature is 45.5°F.
- Newaygo County: May 1 to October 11 (162 days, 1 WNV)
- Gladwin County: May 2 to October 10 (162 days, 0 WNV)
- Arenac County: May 3 to October 11 (161 days, 0 WNV)
- Leelanau County: May 6 to October 13 (161 days, 1 WNV)
West Nile in Mecosta County
CDC ArboNET lists no human West Nile cases for Mecosta County from 1999 to 2025, though virus turned up in birds, mosquitoes or horses in 9 of those years.
More: how the dates are worked out · when mosquitoes go away for the winter.