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

Mosquito months in DeSoto County

In a normal year mosquito season in DeSoto County, MS starts around March 13 and ends around November 16, 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 DeSoto County, and when

• Start tipping out standing water weekly by February 27.
• Book any yard treatment for mid March, ahead of the July peak.
• Repellent can go away after November 16.
• 6 West Nile cases since 2016 (last 2025): you should use repellent at dusk May to September, more so if over 60.

DeSoto County against the rest of MS

DeSoto County has the 65th longest season of 82 MS counties, at 248 days against 333 in Harrison County and 221 in Tishomingo County. Its mean temperature is 61.6°F.

• Grenada County: March 12 to November 15 (248 days, 3 WNV)
• Smith County: March 12 to November 15 (248 days, 1 WNV)
• Chickasaw County: March 12 to November 14 (247 days, 2 WNV)
• Monroe County: March 14 to November 15 (246 days, 5 WNV)

West Nile in DeSoto County

From 1999 to 2025, CDC ArboNET counted 18 human West Nile cases in DeSoto County (13 neuroinvasive) across 11 years. The worst was 2006 with 4; the latest was 2025.

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