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

Mosquito months in Jackson County

In a normal year mosquito season in Jackson County, OK starts around March 22 and ends around November 12, about 34 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 Jackson County, and when

• Start tipping out standing water weekly by March 8.
• Book any yard treatment for late March, ahead of the July peak.
• Repellent can go away after November 12.
• 7 West Nile cases since 2016 (last 2025): you should use repellent at dusk May to September, more so if over 60.

Jackson County against the rest of OK

Jackson County has the 30th longest season of 77 OK counties, at 235 days against 271 in Choctaw County and 193 in Cimarron County. Its mean temperature is 62°F.

• Pontotoc County: March 19 to November 13 (239 days, 0 WNV)
• Kiowa County: March 21 to November 13 (237 days, 1 WNV)
• Roger Mills County: March 22 to November 11 (234 days, 1 WNV)
• Cleveland County: March 23 to November 12 (234 days, 27 WNV)

West Nile in Jackson County

From 1999 to 2025, CDC ArboNET counted 14 human West Nile cases in Jackson County (8 neuroinvasive) across 8 years. The worst was 2025 with 6; the latest was 2025.

More: how the dates are worked out · reading the West Nile counts.