Mosquito season in Callaway County, MO: when it starts and ends
Mosquito months in Callaway County
In a normal year mosquito season in Callaway County, MO starts around April 4 and ends around October 28, about 30 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Callaway County, and when
- Start tipping out standing water weekly by March 21.
- Book any yard treatment for early April, ahead of the July peak.
- Repellent can go away after October 28.
- No West Nile cases since 2016, so bites in Callaway County are a nuisance; check window screens.
Callaway County against the rest of MO
Callaway County has the 77th longest season of 115 MO counties, at 207 days against 242 in Pemiscot County and 187 in Crawford County. Its mean temperature is 53.4°F.
- Perry County: April 5 to October 30 (208 days, 0 WNV)
- Pettis County: April 5 to October 30 (208 days, 0 WNV)
- Macon County: April 5 to October 29 (207 days, 0 WNV)
- Pike County: April 5 to October 29 (207 days, 0 WNV)
West Nile in Callaway County
From 1999 to 2025, CDC ArboNET counted 5 human West Nile cases in Callaway County (3 neuroinvasive) across 4 years. The worst was 2002 with 2; the latest was 2014.
Background: when mosquitoes go away for the winter; how the dates are worked out.