Mosquito season in Ste. Genevieve County, MO: when it starts and ends
Mosquito months in Ste. Genevieve County
In a normal year mosquito season in Ste. Genevieve County, MO starts around March 29 and ends around November 3, about 31 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Ste. Genevieve County, and when
- Start tipping out standing water weekly by March 15.
- Book any yard treatment for late March, ahead of the July peak.
- Repellent can go away after November 3.
- No West Nile cases since 2016, so bites in Ste. Genevieve County are a nuisance; check window screens.
Ste. Genevieve County against the rest of MO
Ste. Genevieve County has the 26th longest season of 115 MO counties, at 219 days against 242 in Pemiscot County and 187 in Crawford County. Its mean temperature is 55.8°F.
- Carter County: March 28 to November 2 (219 days, 1 WNV)
- Morgan County: March 29 to November 3 (219 days, 0 WNV)
- Texas County: March 29 to November 3 (219 days, 1 WNV)
- Benton County: March 30 to November 4 (219 days, 0 WNV)
West Nile in Ste. Genevieve County
From 1999 to 2025, CDC ArboNET counted 1 human West Nile case in Ste. Genevieve County (1 neuroinvasive) across 1 year. The worst was 2013 with 1; the latest was 2013.
See how the dates are worked out, and when the season starts across the US.