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

Mosquito months in Clark County

In a normal year mosquito season in Clark County, AR starts around March 11 and ends around November 16, 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 Clark 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 16.
• 1 West Nile case since 2016 (last 2019): you should use repellent at dusk May to September, more so if over 60.

Clark County against the rest of AR

Clark County has the 35th longest season of 75 AR counties, at 250 days against 274 in Chicot County and 211 in Washington County. Its mean temperature is 62.4°F.

• Sebastian County: March 11 to November 17 (251 days, 6 WNV)
• White County: March 12 to November 18 (251 days, 3 WNV)
• Sevier County: March 13 to November 17 (249 days, 0 WNV)
• Craighead County: March 12 to November 14 (247 days, 2 WNV)

West Nile in Clark County

From 1999 to 2025, CDC ArboNET counted 5 human West Nile cases in Clark County (2 neuroinvasive) across 5 years. The worst was 2019 with 1; the latest was 2019.

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