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

Mosquito months in Lafayette County

In a normal year mosquito season in Lafayette County, AR starts around March 5 and ends around November 25, 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 Lafayette County, and when

• Start tipping out standing water weekly by February 19.
• Book any yard treatment for early March, ahead of the July peak.
• Repellent can go away after November 25.
• 1 West Nile case since 2016 (last 2025): you should use repellent at dusk May to September, more so if over 60.

Lafayette County against the rest of AR

Lafayette County has the 10th longest season of 75 AR counties, at 265 days against 274 in Chicot County and 211 in Washington County. Its mean temperature is 63.7°F.

• Drew County: March 4 to November 25 (266 days, 2 WNV)
• Jefferson County: March 4 to November 25 (266 days, 8 WNV)
• Crittenden County: March 4 to November 22 (263 days, 1 WNV)
• Union County: March 4 to November 21 (262 days, 7 WNV)

West Nile in Lafayette County

From 1999 to 2025, CDC ArboNET counted 2 human West Nile cases in Lafayette County (2 neuroinvasive) across 2 years. The worst was 2025 with 1; the latest was 2025.

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