Mosquito season in Bollinger County, MO: when it starts and ends
Mosquito months in Bollinger County
In a normal year mosquito season in Bollinger County, MO starts around April 1 and ends around November 1, about 31 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Bollinger County, and when
- Start tipping out standing water weekly by March 18.
- Book any yard treatment for early April, ahead of the July peak.
- Repellent can go away after November 1.
- No West Nile cases since 2016, so bites in Bollinger County are a nuisance; check window screens.
Bollinger County against the rest of MO
Bollinger County has the 45th longest season of 115 MO counties, at 214 days against 242 in Pemiscot County and 187 in Crawford County. Its mean temperature is 58°F.
- Washington County: March 31 to November 1 (215 days, 0 WNV)
- Webster County: April 1 to November 2 (215 days, 1 WNV)
- Moniteau County: April 1 to November 1 (214 days, 0 WNV)
- Polk County: April 1 to November 1 (214 days, 0 WNV)
West Nile in Bollinger County
From 1999 to 2025, CDC ArboNET counted 1 human West Nile case in Bollinger County (0 neuroinvasive) across 1 year. The worst was 2002 with 1; the latest was 2002.
Background: when mosquitoes go away for the winter; how the dates are worked out.