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

Mosquito months in Smith County

In a normal year mosquito season in Smith County, MS starts around March 12 and ends around November 15, about 35 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 Smith County, and when

• Start tipping out standing water weekly by February 26.
• Book any yard treatment for mid March, ahead of the July peak.
• Repellent can go away after November 15.
• 1 West Nile case since 2016 (last 2019): you should use repellent at dusk May to September, more so if over 60.

Smith County against the rest of MS

Smith County has the 64th longest season of 82 MS counties, at 248 days against 333 in Harrison County and 221 in Tishomingo County. Its mean temperature is 63.1°F.

• Benton County: March 11 to November 14 (248 days, 0 WNV)
• Grenada County: March 12 to November 15 (248 days, 3 WNV)
• DeSoto County: March 13 to November 16 (248 days, 6 WNV)
• Chickasaw County: March 12 to November 14 (247 days, 2 WNV)

West Nile in Smith County

From 1999 to 2025, CDC ArboNET counted 4 human West Nile cases in Smith County (3 neuroinvasive) across 3 years. The worst was 2012 with 2; the latest was 2019.

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