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

Mosquito months in Marion County

In a normal year mosquito season in Marion County, AR starts around March 20 and ends around November 9, about 33 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 Marion County, and when

• Start tipping out standing water weekly by March 6.
• Book any yard treatment for mid March, ahead of the July peak.
• Repellent can go away after November 9.
• 1 West Nile case since 2016 (last 2017): you should use repellent at dusk June to September, more so if over 60.

Marion County against the rest of AR

Marion County has the 59th longest season of 75 AR counties, at 234 days against 274 in Chicot County and 211 in Washington County. Its mean temperature is 57.9°F.

• Randolph County: March 19 to November 9 (235 days, 0 WNV)
• Baxter County: March 20 to November 10 (235 days, 0 WNV)
• Pike County: March 22 to November 11 (234 days, 0 WNV)
• Polk County: March 22 to November 10 (233 days, 0 WNV)

West Nile in Marion County

From 1999 to 2025, CDC ArboNET counted 2 human West Nile cases in Marion County (1 neuroinvasive) across 2 years. The worst was 2017 with 1; the latest was 2017.

See how the dates are worked out, and when the season starts across the US.