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

Mosquito months in Bolivar County

In a normal year mosquito season in Bolivar County, MS starts around March 2 and ends around November 26, about 38 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 Bolivar County, and when

• Start tipping out standing water weekly by February 16.
• Book any yard treatment for early March, ahead of the July peak.
• Repellent can go away after November 26.
• 2 West Nile cases since 2016 (last 2023): you should use repellent at dusk May to September, more so if over 60.

Bolivar County against the rest of MS

Bolivar County has the 31st longest season of 82 MS counties, at 269 days against 333 in Harrison County and 221 in Tishomingo County. Its mean temperature is 63.4°F.

• Claiborne County: March 1 to November 25 (269 days, 2 WNV)
• Jefferson County: March 1 to November 25 (269 days, 1 WNV)
• Greene County: March 2 to November 26 (269 days, 0 WNV)
• Perry County: March 2 to November 26 (269 days, 2 WNV)

West Nile in Bolivar County

From 1999 to 2025, CDC ArboNET counted 14 human West Nile cases in Bolivar County (6 neuroinvasive) across 10 years. The worst was 2006 with 3; the latest was 2023.

More: how the dates are worked out · when the season starts across the US.