Mosquito season in Oscoda County, MI: when it starts and ends
Mosquito months in Oscoda County
In a normal year mosquito season in Oscoda County, MI starts around May 5 and ends around October 9, about 22 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Oscoda County, and when
- Start tipping out standing water weekly by April 21.
- Book any yard treatment for early May, ahead of the July peak.
- Repellent can go away after October 9.
- 1 West Nile case since 2016 (last 2018): you should use repellent at dusk July, more so if over 60.
Oscoda County against the rest of MI
Oscoda County has the 48th longest season of 83 MI counties, at 157 days against 189 in Allegan County and 124 in Iron County. Its mean temperature is 44.6°F.
- Arenac County: May 3 to October 11 (161 days, 0 WNV)
- Leelanau County: May 6 to October 13 (161 days, 1 WNV)
- Iosco County: May 6 to October 10 (157 days, 0 WNV)
- Montcalm County: May 4 to October 7 (156 days, 3 WNV)
West Nile in Oscoda County
From 1999 to 2025, CDC ArboNET counted 1 human West Nile case in Oscoda County (1 neuroinvasive) across 1 year. The worst was 2018 with 1; the latest was 2018.
Background: when the season starts across the US; how the dates are worked out.