Mosquito season in Cole County, MO: when it starts and ends
Mosquito months in Cole County
In a normal year mosquito season in Cole County, MO starts around March 29 and ends around November 3, about 31 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Cole County, and when
- Start tipping out standing water weekly by March 15.
- Book any yard treatment for late March, ahead of the July peak.
- Repellent can go away after November 3.
- No West Nile cases since 2016, so bites in Cole County are a nuisance; check window screens.
Cole County against the rest of MO
Cole County has the 30th longest season of 115 MO counties, at 218 days against 242 in Pemiscot County and 187 in Crawford County. Its mean temperature is 55.7°F.
- Benton County: March 30 to November 4 (219 days, 0 WNV)
- Greene County: March 30 to November 4 (219 days, 8 WNV)
- Barton County: March 31 to November 4 (218 days, 0 WNV)
- Douglas County: March 31 to November 3 (217 days, 0 WNV)
West Nile in Cole County
From 1999 to 2025, CDC ArboNET counted 6 human West Nile cases in Cole County (3 neuroinvasive) across 2 years. The worst was 2002 with 4; the latest was 2007.
More: how the dates are worked out · when the season starts across the US.