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

Mosquito months in Jackson County

In a normal year mosquito season in Jackson County, MS starts around February 12 and ends around December 8, about 43 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 January 29.
• Book any yard treatment for mid February, ahead of the July peak.
• Repellent can go away after December 8.
• 11 West Nile cases since 2016: you should wear EPA-registered repellent at dusk May to September, and check MS spray notices.

Jackson County against the rest of MS

Jackson County has the 9th longest season of 82 MS counties, at 299 days against 333 in Harrison County and 221 in Tishomingo County. Its mean temperature is 67.2°F.

• Yazoo County: February 15 to December 13 (301 days, 4 WNV)
• Warren County: February 8 to December 4 (299 days, 1 WNV)
• Hancock County: February 16 to December 4 (291 days, 1 WNV)
• Marion County: February 19 to December 4 (288 days, 4 WNV)

West Nile in Jackson County

From 1999 to 2025, CDC ArboNET counted 29 human West Nile cases in Jackson County (18 neuroinvasive) across 12 years. The worst was 2002 with 6; the latest was 2025.

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