Mosquito season in Audrain County, MO: when it starts and ends
Mosquito months in Audrain County
In a normal year mosquito season in Audrain County, MO starts around April 3 and ends around October 30, about 30 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Audrain County, and when
- Start tipping out standing water weekly by March 20.
- Book any yard treatment for early April, ahead of the July peak.
- Repellent can go away after October 30.
- 1 West Nile case since 2016 (last 2025): you should use repellent at dusk June to August, more so if over 60.
Audrain County against the rest of MO
Audrain County has the 62nd longest season of 115 MO counties, at 210 days against 242 in Pemiscot County and 187 in Crawford County. Its mean temperature is 54.2°F.
- St. Clair County: April 4 to November 1 (211 days, 0 WNV)
- Stone County: April 4 to November 1 (211 days, 2 WNV)
- Dent County: April 3 to October 30 (210 days, 0 WNV)
- Lawrence County: April 3 to October 30 (210 days, 0 WNV)
West Nile in Audrain County
From 1999 to 2025, CDC ArboNET counted 3 human West Nile cases in Audrain County (2 neuroinvasive) across 3 years. The worst was 2025 with 1; the latest was 2025.
Background: when mosquitoes go away for the winter; how the dates are worked out.