Mosquito season in Kent County, MI: when it starts and ends
Mosquito months in Kent County
In a normal year mosquito season in Kent County, MI starts around April 27 and ends around October 17, about 25 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Kent County, and when
- Start tipping out standing water weekly by April 13.
- Book any yard treatment for late April, ahead of the July peak.
- Repellent can go away after October 17.
- 46 West Nile cases since 2016: you should wear EPA-registered repellent at dusk July to August, and check MI spray notices.
Kent County against the rest of MI
Kent County has the 22nd longest season of 83 MI counties, at 173 days against 189 in Allegan County and 124 in Iron County. Its mean temperature is 48.4°F.
- St. Clair County: April 26 to October 17 (174 days, 6 WNV)
- Ottawa County: April 27 to October 19 (174 days, 6 WNV)
- Lapeer County: April 27 to October 17 (173 days, 2 WNV)
- Shiawassee County: April 27 to October 16 (173 days, 1 WNV)
West Nile in Kent County
From 1999 to 2025, CDC ArboNET counted 178 human West Nile cases in Kent County (148 neuroinvasive) across 19 years. The worst was 2002 with 58; the latest was 2025.
More: how the dates are worked out · reading the West Nile counts.