Mosquito season in McDonald County, MO: when it starts and ends
Mosquito months in McDonald County
In a normal year mosquito season in McDonald County, MO starts around March 31 and ends around November 1, about 31 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in McDonald 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 1.
- No West Nile cases since 2016, so bites in McDonald County are a nuisance; check window screens.
McDonald County against the rest of MO
McDonald County has the 41st longest season of 115 MO counties, at 215 days against 242 in Pemiscot County and 187 in Crawford County. Its mean temperature is 57.3°F.
- Barry County: April 3 to November 5 (216 days, 0 WNV)
- Dade County: March 31 to November 1 (215 days, 0 WNV)
- Osage County: March 31 to November 1 (215 days, 0 WNV)
- Washington County: March 31 to November 1 (215 days, 0 WNV)
West Nile in McDonald County
From 1999 to 2025, CDC ArboNET counted 1 human West Nile case in McDonald County (1 neuroinvasive) across 1 year. The worst was 2015 with 1; the latest was 2015.
Background: when mosquitoes go away for the winter; how the dates are worked out.