Mosquito season in Cooper County, MO: when it starts and ends
Mosquito months in Cooper County
In a normal year mosquito season in Cooper County, MO starts around April 1 and ends around November 1, about 30 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Cooper County, and when
- Start tipping out standing water weekly by March 18.
- Book any yard treatment for early April, ahead of the July peak.
- Repellent can go away after November 1.
- No West Nile cases since 2016, so bites in Cooper County are a nuisance; check window screens.
Cooper County against the rest of MO
Cooper County has the 49th longest season of 115 MO counties, at 213 days against 242 in Pemiscot County and 187 in Crawford County. Its mean temperature is 54.9°F.
- Polk County: April 1 to November 1 (214 days, 0 WNV)
- St. Francois County: April 1 to November 1 (214 days, 1 WNV)
- Jackson County: April 1 to October 31 (213 days, 21 WNV)
- Pulaski County: April 1 to October 31 (213 days, 2 WNV)
West Nile in Cooper County
CDC ArboNET lists no human West Nile cases for Cooper County from 1999 to 2025, though virus turned up in birds, mosquitoes or horses in 4 of those years.
See how the dates are worked out, and when mosquitoes go away for the winter.