Mosquito season in Lenawee County, MI: when it starts and ends
Mosquito months in Lenawee County
In a normal year mosquito season in Lenawee County, MI starts around April 20 and ends around October 19, about 26 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Lenawee County, and when
- Start tipping out standing water weekly by April 6.
- Book any yard treatment for mid April, ahead of the July peak.
- Repellent can go away after October 19.
- 3 West Nile cases since 2016 (last 2024): you should use repellent at dusk July to August, more so if over 60.
Lenawee County against the rest of MI
Lenawee County has the 7th longest season of 83 MI counties, at 182 days against 189 in Allegan County and 124 in Iron County. Its mean temperature is 49.3°F.
- Kalamazoo County: April 19 to October 19 (183 days, 6 WNV)
- Wayne County: April 21 to October 21 (183 days, 110 WNV)
- Calhoun County: April 21 to October 19 (181 days, 3 WNV)
- Jackson County: April 21 to October 18 (180 days, 3 WNV)
West Nile in Lenawee County
From 1999 to 2025, CDC ArboNET counted 9 human West Nile cases in Lenawee County (8 neuroinvasive) across 7 years. The worst was 2008 with 2; the latest was 2024.
See how the dates are worked out, and when the season starts across the US.