Mosquito season in Montgomery County, MO: when it starts and ends
Mosquito months in Montgomery County
In a normal year mosquito season in Montgomery County, MO starts around April 3 and ends around October 30, about 30 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Montgomery County, and when
- Start tipping out standing water weekly by March 20.
- Book any yard treatment for early April, ahead of the July peak.
- Repellent can go away after October 30.
- No West Nile cases since 2016, so bites in Montgomery County are a nuisance; check window screens.
Montgomery County against the rest of MO
Montgomery County has the 67th longest season of 115 MO counties, at 209 days against 242 in Pemiscot County and 187 in Crawford County. Its mean temperature is 53.9°F.
- Randolph County: April 3 to October 30 (210 days, 1 WNV)
- Howell County: April 4 to October 31 (210 days, 1 WNV)
- Chariton County: April 4 to October 30 (209 days, 0 WNV)
- Laclede County: April 4 to October 30 (209 days, 4 WNV)
West Nile in Montgomery County
CDC ArboNET lists no human West Nile cases for Montgomery County from 1999 to 2025, though virus turned up in birds, mosquitoes or horses in 2 of those years.
See how the dates are worked out, and when the season starts across the US.