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

Mosquito months in Clay County

In a normal year mosquito season in Clay County, MS starts around March 7 and ends around November 22, about 37 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 Clay County, and when

• Start tipping out standing water weekly by February 21.
• Book any yard treatment for early March, ahead of the July peak.
• Repellent can go away after November 22.
• 2 West Nile cases since 2016 (last 2019): you should use repellent at dusk May to September, more so if over 60.

Clay County against the rest of MS

Clay County has the 52nd longest season of 82 MS counties, at 260 days against 333 in Harrison County and 221 in Tishomingo County. Its mean temperature is 62.7°F.

• Noxubee County: March 5 to November 20 (260 days, 2 WNV)
• Quitman County: March 5 to November 20 (260 days, 0 WNV)
• Lee County: March 7 to November 22 (260 days, 8 WNV)
• Oktibbeha County: March 7 to November 22 (260 days, 3 WNV)

West Nile in Clay County

From 1999 to 2025, CDC ArboNET counted 12 human West Nile cases in Clay County (7 neuroinvasive) across 9 years. The worst was 2005 with 2; the latest was 2019.

See how the dates are worked out, and when the season starts across the US.