Mosquito season in Arthur County, NE: when it starts and ends

Mosquito months in Arthur County

In a normal year mosquito season in Arthur County, NE starts around April 30 and ends around October 12, about 24 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 Arthur County, and when

• Start tipping out standing water weekly by April 16.
• Book any yard treatment for late April, ahead of the July peak.
• Repellent can go away after October 12.
• No West Nile cases since 2016, so bites in Arthur County are a nuisance; check window screens.

Arthur County against the rest of NE

Arthur County has the 82nd longest season of 93 NE counties, at 165 days against 200 in Richardson County and 127 in Sioux County. Its mean temperature is 48.8°F.

• Chase County: April 29 to October 13 (167 days, 7 WNV)
• Morrill County: April 29 to October 13 (167 days, 12 WNV)
• Box Butte County: May 1 to October 10 (163 days, 11 WNV)
• Blaine County: May 1 to October 10 (162 days, 1 WNV)

West Nile in Arthur County

CDC ArboNET lists no human West Nile cases for Arthur County from 1999 to 2025, though virus turned up in birds, mosquitoes or horses in 5 of those years.

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