Mosquito season in Chariton County, MO: when it starts and ends
Mosquito months in Chariton County
In a normal year mosquito season in Chariton County, MO starts around April 4 and ends around October 30, about 30 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Chariton County, and when
- Start tipping out standing water weekly by March 21.
- Book any yard treatment for early April, ahead of the July peak.
- Repellent can go away after October 30.
- No West Nile cases since 2016, so bites in Chariton County are a nuisance; check window screens.
Chariton County against the rest of MO
Chariton County has the 68th longest season of 115 MO counties, at 209 days against 242 in Pemiscot County and 187 in Crawford County. Its mean temperature is 54°F.
- Howell County: April 4 to October 31 (210 days, 1 WNV)
- Montgomery County: April 3 to October 30 (209 days, 0 WNV)
- Laclede County: April 4 to October 30 (209 days, 4 WNV)
- Henry County: April 5 to October 31 (209 days, 2 WNV)
West Nile in Chariton County
From 1999 to 2025, CDC ArboNET counted 2 human West Nile cases in Chariton County (1 neuroinvasive) across 2 years. The worst was 2013 with 1; the latest was 2013.
Background: when mosquitoes go away for the winter; how the dates are worked out.