Mosquito season in Clinton County, MO: when it starts and ends
Mosquito months in Clinton County
In a normal year mosquito season in Clinton County, MO starts around April 10 and ends around October 26, about 28 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Clinton County, and when
- Start tipping out standing water weekly by March 27.
- Book any yard treatment for early April, ahead of the July peak.
- Repellent can go away after October 26.
- 1 West Nile case since 2016 (last 2022): you should use repellent at dusk June to August, more so if over 60.
Clinton County against the rest of MO
Clinton County has the 96th longest season of 115 MO counties, at 199 days against 242 in Pemiscot County and 187 in Crawford County. Its mean temperature is 52.4°F.
- Dallas County: April 9 to October 25 (199 days, 1 WNV)
- Knox County: April 9 to October 25 (199 days, 0 WNV)
- Madison County: April 10 to October 26 (199 days, 0 WNV)
- Shelby County: April 11 to October 27 (199 days, 0 WNV)
West Nile in Clinton County
From 1999 to 2025, CDC ArboNET counted 3 human West Nile cases in Clinton County (2 neuroinvasive) across 3 years. The worst was 2022 with 1; the latest was 2022.
More: how the dates are worked out · when the season starts across the US.