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

Mosquito months in Crittenden County

In a normal year mosquito season in Crittenden County, AR starts around March 4 and ends around November 22, 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 Crittenden County, and when

• Start tipping out standing water weekly by February 18.
• Book any yard treatment for early March, ahead of the July peak.
• Repellent can go away after November 22.
• 1 West Nile case since 2016 (last 2022): you should use repellent at dusk May to September, more so if over 60.

Crittenden County against the rest of AR

Crittenden County has the 11th longest season of 75 AR counties, at 263 days against 274 in Chicot County and 211 in Washington County. Its mean temperature is 62.4°F.

• Jefferson County: March 4 to November 25 (266 days, 8 WNV)
• Lafayette County: March 5 to November 25 (265 days, 1 WNV)
• Union County: March 4 to November 21 (262 days, 7 WNV)
• Phillips County: March 5 to November 22 (262 days, 0 WNV)

West Nile in Crittenden County

From 1999 to 2025, CDC ArboNET counted 12 human West Nile cases in Crittenden County (10 neuroinvasive) across 8 years. The worst was 2002 with 4; the latest was 2022.

Background: when the season starts across the US; how the dates are worked out.