Mosquito season in Bryan County, OK: when it starts and ends
Mosquito months in Bryan County
In a normal year mosquito season in Bryan County, OK starts around March 5 and ends around November 24, about 38 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Bryan County, and when
- Start tipping out standing water weekly by February 19.
- Book any yard treatment for early March, ahead of the August peak.
- Repellent can go away after November 24.
- 2 West Nile cases since 2016 (last 2017): you should use repellent at dusk May to September, more so if over 60.
Bryan County against the rest of OK
Bryan County has the 2nd longest season of 77 OK counties, at 264 days against 271 in Choctaw County and 193 in Cimarron County. Its mean temperature is 63.3°F.
- Choctaw County: March 2 to November 28 (271 days, 0 WNV)
- Carter County: March 7 to November 19 (257 days, 6 WNV)
- Tillman County: March 11 to November 21 (255 days, 0 WNV)
West Nile in Bryan County
From 1999 to 2025, CDC ArboNET counted 7 human West Nile cases in Bryan County (3 neuroinvasive) across 4 years. The worst was 2012 with 4; the latest was 2017.
Background: when mosquitoes go away for the winter; how the dates are worked out.