Mosquito season in Randolph County, MO: when it starts and ends
Mosquito months in Randolph County
In a normal year mosquito season in Randolph 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 Randolph 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.
- 1 West Nile case since 2016 (last 2017): you should use repellent at dusk June to August, more so if over 60.
Randolph County against the rest of MO
Randolph County has the 65th longest season of 115 MO counties, at 210 days against 242 in Pemiscot County and 187 in Crawford County. Its mean temperature is 54.2°F.
- Dent County: April 3 to October 30 (210 days, 0 WNV)
- Lawrence County: April 3 to October 30 (210 days, 0 WNV)
- Howell County: April 4 to October 31 (210 days, 1 WNV)
- Montgomery County: April 3 to October 30 (209 days, 0 WNV)
West Nile in Randolph County
From 1999 to 2025, CDC ArboNET counted 5 human West Nile cases in Randolph County (5 neuroinvasive) across 5 years. The worst was 2017 with 1; the latest was 2017.
More: how the dates are worked out · when mosquitoes go away for the winter.