Mosquito season in Mississippi County, AR: when it starts and ends

Mosquito months in Mississippi County

In a normal year mosquito season in Mississippi County, AR starts around March 11 and ends around November 18, about 36 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 Mississippi County, and when

• Start tipping out standing water weekly by February 25.
• Book any yard treatment for mid March, ahead of the July peak.
• Repellent can go away after November 18.
• 2 West Nile cases since 2016 (last 2025): you should use repellent at dusk May to September, more so if over 60.

Mississippi County against the rest of AR

Mississippi County has the 31st longest season of 75 AR counties, at 252 days against 274 in Chicot County and 211 in Washington County. Its mean temperature is 61.4°F.

• Saline County: March 9 to November 18 (254 days, 6 WNV)
• Dallas County: March 10 to November 17 (252 days, 3 WNV)
• Hempstead County: March 11 to November 17 (251 days, 0 WNV)
• Sebastian County: March 11 to November 17 (251 days, 6 WNV)

West Nile in Mississippi County

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

See how the dates are worked out, and when mosquitoes go away for the winter.