Mosquito season in Andrew County, MO: when it starts and ends
Mosquito months in Andrew County
In a normal year mosquito season in Andrew County, MO starts around April 8 and ends around October 26, about 29 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Andrew County, and when
- Start tipping out standing water weekly by March 25.
- Book any yard treatment for early April, ahead of the July peak.
- Repellent can go away after October 26.
- No West Nile cases since 2016, so bites in Andrew County are a nuisance; check window screens.
Andrew County against the rest of MO
Andrew County has the 87th longest season of 115 MO counties, at 201 days against 242 in Pemiscot County and 187 in Crawford County. Its mean temperature is 52.7°F.
- Lewis County: April 8 to October 27 (202 days, 0 WNV)
- Linn County: April 7 to October 25 (201 days, 0 WNV)
- Livingston County: April 8 to October 26 (201 days, 1 WNV)
- Ray County: April 8 to October 26 (201 days, 0 WNV)
West Nile in Andrew County
From 1999 to 2025, CDC ArboNET counted 1 human West Nile case in Andrew County (1 neuroinvasive) across 1 year. The worst was 2013 with 1; the latest was 2013.
More: how the dates are worked out · when the season starts across the US.