Mosquito season in McClain County, OK: when it starts and ends
Mosquito months in McClain County
In a normal year mosquito season in McClain County, OK starts around March 23 and ends around November 11, about 33 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in McClain County, and when
- Start tipping out standing water weekly by March 9.
- Book any yard treatment for late March, ahead of the July peak.
- Repellent can go away after November 11.
- No West Nile cases since 2016, so bites in McClain County are a nuisance; check window screens.
McClain County against the rest of OK
McClain County has the 34th longest season of 77 OK counties, at 233 days against 271 in Choctaw County and 193 in Cimarron County. Its mean temperature is 61.2°F.
- Cleveland County: March 23 to November 12 (234 days, 27 WNV)
- Logan County: March 23 to November 11 (233 days, 1 WNV)
- Cherokee County: March 23 to November 10 (232 days, 0 WNV)
- Le Flore County: March 25 to November 12 (232 days, 1 WNV)
West Nile in McClain County
From 1999 to 2025, CDC ArboNET counted 5 human West Nile cases in McClain County (3 neuroinvasive) across 4 years. The worst was 2007 with 2; the latest was 2015.
Background: when the season starts across the US; how the dates are worked out.