Mosquito season in Custer County, OK: when it starts and ends
Mosquito months in Custer County
In a normal year mosquito season in Custer County, OK starts around April 1 and ends around November 5, about 31 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Custer County, and when
- Start tipping out standing water weekly by March 18.
- Book any yard treatment for early April, ahead of the July peak.
- Repellent can go away after November 5.
- 1 West Nile case since 2016 (last 2018): you should use repellent at dusk June to September, more so if over 60.
Custer County against the rest of OK
Custer County has the 64th longest season of 77 OK counties, at 218 days against 271 in Choctaw County and 193 in Cimarron County. Its mean temperature is 60.2°F.
- Pushmataha County: March 31 to November 4 (218 days, 2 WNV)
- Alfalfa County: April 1 to November 5 (218 days, 1 WNV)
- Beckham County: April 1 to November 4 (217 days, 2 WNV)
- Grant County: April 1 to November 4 (217 days, 2 WNV)
West Nile in Custer County
From 1999 to 2025, CDC ArboNET counted 9 human West Nile cases in Custer County (3 neuroinvasive) across 6 years. The worst was 2015 with 4; the latest was 2018.
Background: when mosquitoes go away for the winter; how the dates are worked out.