Mosquito season in Jackson County, MI: when it starts and ends
Mosquito months in Jackson County
In a normal year mosquito season in Jackson County, MI starts around April 21 and ends around October 18, about 26 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Jackson County, and when
- Start tipping out standing water weekly by April 7.
- Book any yard treatment for late April, ahead of the July peak.
- Repellent can go away after October 18.
- 3 West Nile cases since 2016 (last 2024): you should use repellent at dusk July to July, more so if over 60.
Jackson County against the rest of MI
Jackson County has the 9th longest season of 83 MI counties, at 180 days against 189 in Allegan County and 124 in Iron County. Its mean temperature is 48.9°F.
- Lenawee County: April 20 to October 19 (182 days, 3 WNV)
- Calhoun County: April 21 to October 19 (181 days, 3 WNV)
- Clinton County: April 23 to October 20 (180 days, 4 WNV)
- Ingham County: April 22 to October 18 (179 days, 12 WNV)
West Nile in Jackson County
From 1999 to 2025, CDC ArboNET counted 6 human West Nile cases in Jackson County (5 neuroinvasive) across 3 years. The worst was 2024 with 3; the latest was 2024.
More: how the dates are worked out · when the season starts across the US.