Mosquito season in Douglas County, MO: when it starts and ends
Mosquito months in Douglas County
In a normal year mosquito season in Douglas County, MO starts around March 31 and ends around November 3, about 31 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Douglas 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 3.
- No West Nile cases since 2016, so bites in Douglas County are a nuisance; check window screens.
Douglas County against the rest of MO
Douglas County has the 32nd longest season of 115 MO counties, at 217 days against 242 in Pemiscot County and 187 in Crawford County. Its mean temperature is 55.8°F.
- Cole County: March 29 to November 3 (218 days, 0 WNV)
- Barton County: March 31 to November 4 (218 days, 0 WNV)
- Franklin County: March 31 to November 3 (217 days, 0 WNV)
- Jefferson County: March 31 to November 3 (217 days, 3 WNV)
West Nile in Douglas County
CDC ArboNET lists no human West Nile cases for Douglas County from 1999 to 2025, though virus turned up in birds, mosquitoes or horses in 3 of those years.
More: how the dates are worked out · when the season starts across the US.