Mosquito season in Adair County, MO: when it starts and ends
Mosquito months in Adair County
In a normal year mosquito season in Adair County, MO starts around April 12 and ends around October 24, about 28 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Adair County, and when
- Start tipping out standing water weekly by March 29.
- Book any yard treatment for mid April, ahead of the July peak.
- Repellent can go away after October 24.
- No West Nile cases since 2016, so bites in Adair County are a nuisance; check window screens.
Adair County against the rest of MO
Adair County has the 105th longest season of 115 MO counties, at 195 days against 242 in Pemiscot County and 187 in Crawford County. Its mean temperature is 51.4°F.
- DeKalb County: April 11 to October 24 (196 days, 0 WNV)
- Nodaway County: April 11 to October 23 (195 days, 0 WNV)
- Caldwell County: April 13 to October 24 (194 days, 1 WNV)
- Schuyler County: April 13 to October 23 (194 days, 0 WNV)
West Nile in Adair County
From 1999 to 2025, CDC ArboNET counted 3 human West Nile cases in Adair County (1 neuroinvasive) across 2 years. The worst was 2005 with 2; the latest was 2005.
Background: when the season starts across the US; how the dates are worked out.