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

Mosquito months in Columbia County

In a normal year mosquito season in Columbia County, AR starts around March 14 and ends around November 13, about 35 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 Columbia County, and when

• Start tipping out standing water weekly by February 28.
• Book any yard treatment for mid March, ahead of the July peak.
• Repellent can go away after November 13.
• 3 West Nile cases since 2016 (last 2017): you should use repellent at dusk May to September, more so if over 60.

Columbia County against the rest of AR

Columbia County has the 45th longest season of 75 AR counties, at 244 days against 274 in Chicot County and 211 in Washington County. Its mean temperature is 62.7°F.

• Conway County: March 14 to November 14 (245 days, 1 WNV)
• Franklin County: March 15 to November 15 (245 days, 0 WNV)
• Poinsett County: March 15 to November 14 (244 days, 0 WNV)
• Grant County: March 16 to November 15 (244 days, 0 WNV)

West Nile in Columbia County

From 1999 to 2025, CDC ArboNET counted 11 human West Nile cases in Columbia County (10 neuroinvasive) across 7 years. The worst was 2012 with 4; the latest was 2017.

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