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

Mosquito months in Sebastian County

In a normal year mosquito season in Sebastian County, AR starts around March 11 and ends around November 17, 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 Sebastian 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 17.
• 6 West Nile cases since 2016 (last 2024): you should use repellent at dusk June to September, more so if over 60.

Sebastian County against the rest of AR

Sebastian County has the 33rd longest season of 75 AR counties, at 251 days against 274 in Chicot County and 211 in Washington County. Its mean temperature is 61.7°F.

• Mississippi County: March 11 to November 18 (252 days, 2 WNV)
• Hempstead County: March 11 to November 17 (251 days, 0 WNV)
• White County: March 12 to November 18 (251 days, 3 WNV)
• Clark County: March 11 to November 16 (250 days, 1 WNV)

West Nile in Sebastian County

From 1999 to 2025, CDC ArboNET counted 21 human West Nile cases in Sebastian County (17 neuroinvasive) across 14 years. The worst was 2021 with 2; the latest was 2024.

Background: reading the West Nile counts; how the dates are worked out.