Mosquito season in Barton County, MO: when it starts and ends
Mosquito months in Barton County
In a normal year mosquito season in Barton County, MO starts around March 31 and ends around November 4, about 31 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Barton County, and when
- Start tipping out standing water weekly by March 17.
- Book any yard treatment for late March, ahead of the July peak.
- Repellent can go away after November 4.
- No West Nile cases since 2016, so bites in Barton County are a nuisance; check window screens.
Barton County against the rest of MO
Barton County has the 31st longest season of 115 MO counties, at 218 days against 242 in Pemiscot County and 187 in Crawford County. Its mean temperature is 56.2°F.
- Greene County: March 30 to November 4 (219 days, 8 WNV)
- Cole County: March 29 to November 3 (218 days, 0 WNV)
- Douglas County: March 31 to November 3 (217 days, 0 WNV)
- Franklin County: March 31 to November 3 (217 days, 0 WNV)
West Nile in Barton County
From 1999 to 2025, CDC ArboNET counted 1 human West Nile case in Barton County (1 neuroinvasive) across 1 year. The worst was 2006 with 1; the latest was 2006.
More: how the dates are worked out · when mosquitoes go away for the winter.