Mosquito season in Charlevoix County, MI: when it starts and ends
Mosquito months in Charlevoix County
In a normal year mosquito season in Charlevoix County, MI starts around May 9 and ends around October 11, about 22 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Charlevoix County, and when
- Start tipping out standing water weekly by April 25.
- 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 Charlevoix County are a nuisance; check window screens.
Charlevoix County against the rest of MI
Charlevoix County has the 56th longest season of 83 MI counties, at 155 days against 189 in Allegan County and 124 in Iron County. Its mean temperature is 44.5°F.
- Wexford County: May 5 to October 7 (155 days, 0 WNV)
- Clare County: May 6 to October 8 (155 days, 0 WNV)
- Roscommon County: May 4 to October 5 (154 days, 0 WNV)
- Presque Isle County: May 8 to October 8 (153 days, 1 WNV)
West Nile in Charlevoix County
CDC ArboNET lists no human West Nile cases for Charlevoix County from 1999 to 2025, though virus turned up in birds, mosquitoes or horses in 7 of those years.
Background: when the season starts across the US; how the dates are worked out.