Mosquito season in Saginaw County, MI: when it starts and ends
Mosquito months in Saginaw County
In a normal year mosquito season in Saginaw County, MI starts around April 25 and ends around October 17, about 25 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Saginaw County, and when
- Start tipping out standing water weekly by April 11.
- Book any yard treatment for late April, ahead of the July peak.
- Repellent can go away after October 17.
- 1 West Nile case since 2016 (last 2017): you should use repellent at dusk July to August, more so if over 60.
Saginaw County against the rest of MI
Saginaw County has the 19th longest season of 83 MI counties, at 174 days against 189 in Allegan County and 124 in Iron County. Its mean temperature is 48°F.
- Hillsdale County: April 24 to October 16 (175 days, 2 WNV)
- Barry County: April 25 to October 16 (174 days, 2 WNV)
- St. Clair County: April 26 to October 17 (174 days, 6 WNV)
- Ottawa County: April 27 to October 19 (174 days, 6 WNV)
West Nile in Saginaw County
From 1999 to 2025, CDC ArboNET counted 3 human West Nile cases in Saginaw County (2 neuroinvasive) across 2 years. The worst was 2002 with 2; the latest was 2017.
More: how the dates are worked out · when mosquitoes go away for the winter.