Mosquito season in Harmon County, OK: when it starts and ends
Mosquito months in Harmon County
In a normal year mosquito season in Harmon County, OK starts around March 25 and ends around November 7, about 32 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Harmon County, and when
- Start tipping out standing water weekly by March 11.
- Book any yard treatment for late March, ahead of the July peak.
- Repellent can go away after November 7.
- No West Nile cases since 2016, so bites in Harmon County are a nuisance; check window screens.
Harmon County against the rest of OK
Harmon County has the 48th longest season of 77 OK counties, at 227 days against 271 in Choctaw County and 193 in Cimarron County. Its mean temperature is 61.1°F.
- Rogers County: March 25 to November 8 (228 days, 2 WNV)
- Greer County: March 27 to November 10 (228 days, 0 WNV)
- Woodward County: March 25 to November 7 (227 days, 3 WNV)
- Payne County: March 27 to November 9 (227 days, 2 WNV)
West Nile in Harmon County
CDC ArboNET lists no human West Nile cases for Harmon County from 1999 to 2025, though virus turned up in birds, mosquitoes or horses in 1 of those years.
See how the dates are worked out, and when the season starts across the US.