Mosquito season in Stephens County, OK: when it starts and ends
Mosquito months in Stephens County
In a normal year mosquito season in Stephens County, OK starts around March 12 and ends around November 16, about 36 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Stephens County, and when
- Start tipping out standing water weekly by February 26.
- Book any yard treatment for mid March, ahead of the July peak.
- Repellent can go away after November 16.
- 8 West Nile cases since 2016 (last 2025): you should use repellent at dusk June to September, more so if over 60.
Stephens County against the rest of OK
Stephens County has the 9th longest season of 77 OK counties, at 249 days against 271 in Choctaw County and 193 in Cimarron County. Its mean temperature is 62.1°F.
- Haskell County: March 9 to November 16 (252 days, 0 WNV)
- Comanche County: March 11 to November 16 (250 days, 8 WNV)
- Atoka County: March 12 to November 14 (247 days, 0 WNV)
- Jefferson County: March 13 to November 14 (246 days, 0 WNV)
West Nile in Stephens County
From 1999 to 2025, CDC ArboNET counted 16 human West Nile cases in Stephens County (11 neuroinvasive) across 9 years. The worst was 2015 with 5; the latest was 2025.
More: how the dates are worked out · reading the West Nile counts.