Mosquito season in Jasper County, MO: when it starts and ends
Mosquito months in Jasper County
In a normal year mosquito season in Jasper County, MO starts around March 27 and ends around November 5, about 32 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Jasper County, and when
- Start tipping out standing water weekly by March 13.
- Book any yard treatment for late March, ahead of the July peak.
- Repellent can go away after November 5.
- No West Nile cases since 2016, so bites in Jasper County are a nuisance; check window screens.
Jasper County against the rest of MO
Jasper County has the 16th longest season of 115 MO counties, at 223 days against 242 in Pemiscot County and 187 in Crawford County. Its mean temperature is 58.2°F.
- St. Louis County: March 26 to November 6 (225 days, 41 WNV)
- Stoddard County: March 27 to November 7 (225 days, 1 WNV)
- Maries County: March 28 to November 5 (222 days, 0 WNV)
- Hickory County: March 29 to November 6 (222 days, 0 WNV)
West Nile in Jasper County
From 1999 to 2025, CDC ArboNET counted 9 human West Nile cases in Jasper County (9 neuroinvasive) across 4 years. The worst was 2007 with 5; the latest was 2008.
Background: when the season starts across the US; how the dates are worked out.