Mosquito season in Chippewa County, MI: when it starts and ends
Mosquito months in Chippewa County
In a normal year mosquito season in Chippewa County, MI starts around May 11 and ends around October 3, about 21 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Chippewa County, and when
- Start tipping out standing water weekly by April 27.
- Book any yard treatment for mid May, ahead of the July peak.
- Repellent can go away after October 3.
- No West Nile cases since 2016, so bites in Chippewa County are a nuisance; check window screens.
Chippewa County against the rest of MI
Chippewa County has the 70th longest season of 83 MI counties, at 145 days against 189 in Allegan County and 124 in Iron County. Its mean temperature is 41.9°F.
- Kalkaska County: May 10 to October 4 (147 days, 0 WNV)
- Delta County: May 11 to October 5 (147 days, 1 WNV)
- Dickinson County: May 11 to October 3 (145 days, 0 WNV)
- Mackinac County: May 12 to October 3 (144 days, 0 WNV)
West Nile in Chippewa County
CDC ArboNET lists no human West Nile cases for Chippewa County from 1999 to 2025, though virus turned up in birds, mosquitoes or horses in 12 of those years.
Background: when the season starts across the US; how the dates are worked out.