Mosquito season in Le Flore County, OK: when it starts and ends

Mosquito months in Le Flore County

In a normal year mosquito season in Le Flore County, OK starts around March 25 and ends around November 12, about 33 weeks.

1. Jan
2. Feb
3. Mar
4. Apr
5. May
6. Jun
7. Jul
8. Aug
9. Sep
10. Oct
11. Nov
12. Dec

What to do in Le Flore County, and when

• Start tipping out standing water weekly by March 11.
• Book any yard treatment for late March, ahead of the July peak.
• Repellent can go away after November 12.
• 1 West Nile case since 2016 (last 2017): you should use repellent at dusk June to September, more so if over 60.

Le Flore County against the rest of OK

Le Flore County has the 36th longest season of 77 OK counties, at 232 days against 271 in Choctaw County and 193 in Cimarron County. Its mean temperature is 61.1°F.

• McClain County: March 23 to November 11 (233 days, 0 WNV)
• Cherokee County: March 23 to November 10 (232 days, 0 WNV)
• Murray County: March 23 to November 9 (231 days, 1 WNV)
• Washita County: March 23 to November 9 (231 days, 0 WNV)

West Nile in Le Flore County

From 1999 to 2025, CDC ArboNET counted 7 human West Nile cases in Le Flore County (5 neuroinvasive) across 5 years. The worst was 2015 with 2; the latest was 2017.

Background: when mosquitoes go away for the winter; how the dates are worked out.