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

Mosquito months in Canadian County

In a normal year mosquito season in Canadian County, OK starts around March 26 and ends around November 7, about 32 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 Canadian County, and when

• Start tipping out standing water weekly by March 12.
• Book any yard treatment for late March, ahead of the July peak.
• Repellent can go away after November 7.
• 13 West Nile cases since 2016: you should wear EPA-registered repellent at dusk June to September, and check OK spray notices.

Canadian County against the rest of OK

Canadian County has the 51st longest season of 77 OK counties, at 226 days against 271 in Choctaw County and 193 in Cimarron County. Its mean temperature is 59.1°F.

• Woodward County: March 25 to November 7 (227 days, 3 WNV)
• Payne County: March 27 to November 9 (227 days, 2 WNV)
• Craig County: March 25 to November 5 (225 days, 0 WNV)
• Ottawa County: March 25 to November 5 (225 days, 1 WNV)

West Nile in Canadian County

From 1999 to 2025, CDC ArboNET counted 26 human West Nile cases in Canadian County (18 neuroinvasive) across 11 years. The worst was 2017 with 6; the latest was 2025.

See how the dates are worked out, and reading the West Nile counts.