Mosquito season in Osage County, OK: when it starts and ends
Mosquito months in Osage County
In a normal year mosquito season in Osage County, OK starts around March 28 and ends around November 6, about 32 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Osage County, and when
- Start tipping out standing water weekly by March 14.
- Book any yard treatment for late March, ahead of the July peak.
- Repellent can go away after November 6.
- 1 West Nile case since 2016 (last 2017): you should use repellent at dusk June to September, more so if over 60.
Osage County against the rest of OK
Osage County has the 55th longest season of 77 OK counties, at 223 days against 271 in Choctaw County and 193 in Cimarron County. Its mean temperature is 59.9°F.
- Ottawa County: March 25 to November 5 (225 days, 1 WNV)
- Lincoln County: March 28 to November 7 (224 days, 1 WNV)
- Kingfisher County: March 29 to November 7 (223 days, 1 WNV)
- Noble County: March 28 to November 5 (222 days, 0 WNV)
West Nile in Osage County
From 1999 to 2025, CDC ArboNET counted 6 human West Nile cases in Osage County (2 neuroinvasive) across 5 years. The worst was 2013 with 2; the latest was 2017.
More: how the dates are worked out · when the season starts across the US.