Mosquito season in Tuscola County, MI: when it starts and ends
Mosquito months in Tuscola County
In a normal year mosquito season in Tuscola County, MI starts around April 29 and ends around October 14, about 24 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Tuscola County, and when
- Start tipping out standing water weekly by April 15.
- Book any yard treatment for late April, ahead of the July peak.
- Repellent can go away after October 14.
- 4 West Nile cases since 2016 (last 2025): you should use repellent at dusk July to July, more so if over 60.
Tuscola County against the rest of MI
Tuscola County has the 35th longest season of 83 MI counties, at 168 days against 189 in Allegan County and 124 in Iron County. Its mean temperature is 46.7°F.
- Ionia County: April 27 to October 13 (170 days, 2 WNV)
- Manistee County: April 30 to October 17 (170 days, 0 WNV)
- Sanilac County: May 2 to October 14 (165 days, 4 WNV)
- Oceana County: May 2 to October 13 (164 days, 0 WNV)
West Nile in Tuscola County
From 1999 to 2025, CDC ArboNET counted 5 human West Nile cases in Tuscola County (3 neuroinvasive) across 4 years. The worst was 2025 with 2; the latest was 2025.
See how the dates are worked out, and reading the West Nile counts.