Mosquito season in Kalkaska County, MI: when it starts and ends
Mosquito months in Kalkaska County
In a normal year mosquito season in Kalkaska County, MI starts around May 10 and ends around October 4, about 21 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Kalkaska County, and when
- Start tipping out standing water weekly by April 26.
- Book any yard treatment for early May, ahead of the July peak.
- Repellent can go away after October 4.
- No West Nile cases since 2016, so bites in Kalkaska County are a nuisance; check window screens.
Kalkaska County against the rest of MI
Kalkaska County has the 68th longest season of 83 MI counties, at 147 days against 189 in Allegan County and 124 in Iron County. Its mean temperature is 42.7°F.
- Missaukee County: May 10 to October 5 (148 days, 0 WNV)
- Otsego County: May 9 to October 3 (147 days, 0 WNV)
- Delta County: May 11 to October 5 (147 days, 1 WNV)
- Chippewa County: May 11 to October 3 (145 days, 0 WNV)
West Nile in Kalkaska County
CDC ArboNET lists no human West Nile cases for Kalkaska County from 1999 to 2025, though virus turned up in birds, mosquitoes or horses in 3 of those years.
More: how the dates are worked out · when the season starts across the US.