Mosquito season in Carter County, OK: when it starts and ends
Mosquito months in Carter County
In a normal year mosquito season in Carter County, OK starts around March 7 and ends around November 19, about 37 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Carter County, and when
- Start tipping out standing water weekly by February 21.
- Book any yard treatment for early March, ahead of the July peak.
- Repellent can go away after November 19.
- 6 West Nile cases since 2016 (last 2025): you should use repellent at dusk May to September, more so if over 60.
Carter County against the rest of OK
Carter County has the 3rd longest season of 77 OK counties, at 257 days against 271 in Choctaw County and 193 in Cimarron County. Its mean temperature is 62.8°F.
- Choctaw County: March 2 to November 28 (271 days, 0 WNV)
- Bryan County: March 5 to November 24 (264 days, 2 WNV)
- Tillman County: March 11 to November 21 (255 days, 0 WNV)
- Okfuskee County: March 11 to November 20 (254 days, 1 WNV)
West Nile in Carter County
From 1999 to 2025, CDC ArboNET counted 55 human West Nile cases in Carter County (33 neuroinvasive) across 12 years. The worst was 2012 with 20; the latest was 2025.
See how the dates are worked out, and reading the West Nile counts.