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

Mosquito months in Washington County

In a normal year mosquito season in Washington County, AR starts around April 3 and ends around October 31, about 30 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 Washington County, and when

• Start tipping out standing water weekly by March 20.
• Book any yard treatment for early April, ahead of the July peak.
• Repellent can go away after October 31.
• 3 West Nile cases since 2016 (last 2022): you should use repellent at dusk June to August, more so if over 60.

Washington County against the rest of AR

Washington County has the 75th longest season of 75 AR counties, at 211 days against 274 in Chicot County and 211 in Washington County. Its mean temperature is 57.6°F.

• Van Buren County: March 30 to November 6 (221 days, 0 WNV)
• Benton County: March 31 to November 4 (218 days, 2 WNV)

West Nile in Washington County

From 1999 to 2025, CDC ArboNET counted 12 human West Nile cases in Washington County (10 neuroinvasive) across 9 years. The worst was 2012 with 3; the latest was 2022.

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