Mosquito season in Ray County, MO: when it starts and ends
Mosquito months in Ray County
In a normal year mosquito season in Ray 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 Ray 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 Ray County are a nuisance; check window screens.
Ray County against the rest of MO
Ray County has the 89th longest season of 115 MO counties, at 201 days against 242 in Pemiscot County and 187 in Crawford County. Its mean temperature is 53°F.
- Andrew County: April 8 to October 26 (201 days, 0 WNV)
- Livingston County: April 8 to October 26 (201 days, 1 WNV)
- Holt County: April 8 to October 25 (200 days, 0 WNV)
- Buchanan County: April 9 to October 26 (200 days, 7 WNV)
West Nile in Ray County
From 1999 to 2025, CDC ArboNET counted 2 human West Nile cases in Ray County (0 neuroinvasive) across 2 years. The worst was 2013 with 1; the latest was 2013.
See how the dates are worked out, and when mosquitoes go away for the winter.