Mosquito season in Carroll County, MO: when it starts and ends
Mosquito months in Carroll County
In a normal year mosquito season in Carroll 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 Carroll 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 Carroll County are a nuisance; check window screens.
Carroll County against the rest of MO
Carroll County has the 71st 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.
- Laclede County: April 4 to October 30 (209 days, 4 WNV)
- Henry County: April 5 to October 31 (209 days, 2 WNV)
- Lafayette County: April 4 to October 29 (208 days, 0 WNV)
- Saline County: April 4 to October 29 (208 days, 1 WNV)
West Nile in Carroll County
From 1999 to 2025, CDC ArboNET counted 3 human West Nile cases in Carroll County (3 neuroinvasive) across 3 years. The worst was 2012 with 1; the latest was 2012.
Background: when the season starts across the US; how the dates are worked out.