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

Mosquito months in Walthall County

In a normal year mosquito season in Walthall County, MS starts around February 28 and ends around December 1, about 39 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 Walthall County, and when

• Start tipping out standing water weekly by February 14.
• Book any yard treatment for late February, ahead of the August peak.
• Repellent can go away after December 1.
• 1 West Nile case since 2016 (last 2018): you should use repellent at dusk May to September, more so if over 60.

Walthall County against the rest of MS

Walthall County has the 19th longest season of 82 MS counties, at 276 days against 333 in Harrison County and 221 in Tishomingo County. Its mean temperature is 66.1°F.

• Tallahatchie County: February 24 to November 29 (278 days, 0 WNV)
• Sunflower County: February 26 to November 28 (276 days, 4 WNV)
• Wilkinson County: February 28 to December 1 (276 days, 1 WNV)
• Lowndes County: February 26 to November 27 (274 days, 6 WNV)

West Nile in Walthall County

From 1999 to 2025, CDC ArboNET counted 8 human West Nile cases in Walthall County (3 neuroinvasive) across 5 years. The worst was 2012 with 3; the latest was 2018.

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