Mosquito season in Perry County, MO: when it starts and ends
Mosquito months in Perry County
In a normal year mosquito season in Perry County, MO starts around April 5 and ends around October 30, about 30 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Perry County, and when
- Start tipping out standing water weekly by March 22.
- Book any yard treatment for early April, ahead of the July peak.
- Repellent can go away after October 30.
- No West Nile cases since 2016, so bites in Perry County are a nuisance; check window screens.
Perry County against the rest of MO
Perry County has the 75th longest season of 115 MO counties, at 208 days against 242 in Pemiscot County and 187 in Crawford County. Its mean temperature is 55.2°F.
- Saline County: April 4 to October 29 (208 days, 1 WNV)
- Oregon County: April 5 to October 30 (208 days, 1 WNV)
- Pettis County: April 5 to October 30 (208 days, 0 WNV)
- Callaway County: April 4 to October 28 (207 days, 0 WNV)
West Nile in Perry County
CDC ArboNET lists no human West Nile cases for Perry County from 1999 to 2025, though virus turned up in birds, mosquitoes or horses in 2 of those years.
Background: when mosquitoes go away for the winter; how the dates are worked out.