Mosquito season in Lafayette County, MO: when it starts and ends
Mosquito months in Lafayette County
In a normal year mosquito season in Lafayette County, MO starts around April 4 and ends around October 29, about 30 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Lafayette 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 29.
- No West Nile cases since 2016, so bites in Lafayette County are a nuisance; check window screens.
Lafayette County against the rest of MO
Lafayette County has the 72nd longest season of 115 MO counties, at 208 days against 242 in Pemiscot County and 187 in Crawford County. Its mean temperature is 53.9°F.
- Henry County: April 5 to October 31 (209 days, 2 WNV)
- Carroll County: April 4 to October 29 (208 days, 0 WNV)
- Saline County: April 4 to October 29 (208 days, 1 WNV)
- Oregon County: April 5 to October 30 (208 days, 1 WNV)
West Nile in Lafayette County
From 1999 to 2025, CDC ArboNET counted 6 human West Nile cases in Lafayette County (3 neuroinvasive) across 6 years. 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.