Mosquito season in Cimarron County, OK: when it starts and ends
Mosquito months in Cimarron County
In a normal year mosquito season in Cimarron County, OK starts around April 15 and ends around October 25, about 28 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Cimarron County, and when
- Start tipping out standing water weekly by April 1.
- Book any yard treatment for mid April, ahead of the July peak.
- Repellent can go away after October 25.
- No West Nile cases since 2016, so bites in Cimarron County are a nuisance; check window screens.
Cimarron County against the rest of OK
Cimarron County has the 77th longest season of 77 OK counties, at 193 days against 271 in Choctaw County and 193 in Cimarron County. Its mean temperature is 56.3°F.
- Dewey County: April 8 to October 29 (204 days, 1 WNV)
- Beaver County: April 10 to October 29 (202 days, 5 WNV)
West Nile in Cimarron County
From 1999 to 2025, CDC ArboNET counted 3 human West Nile cases in Cimarron County (3 neuroinvasive) across 2 years. The worst was 2003 with 2; the latest was 2007.
More: how the dates are worked out · when the season starts across the US.