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

Mosquito months in Garfield County

In a normal year mosquito season in Garfield County, NE starts around April 27 and ends around October 12, about 24 weeks.

What to do in Garfield County, and when

Start tipping out standing water weekly by April 13.
Book any yard treatment for late April, ahead of the July peak.
Repellent can go away after October 12.
1 West Nile case since 2016 (last 2021): you should use repellent at dusk July to August, more so if over 60.

Garfield County against the rest of NE

Garfield County has the 74th longest season of 93 NE counties, at 168 days against 200 in Richardson County and 127 in Sioux County. Its mean temperature is 48.3°F.

Cheyenne County: April 27 to October 13 (169 days, 11 WNV)
Rock County: April 26 to October 11 (168 days, 0 WNV)
Deuel County: April 28 to October 13 (168 days, 6 WNV)
Grant County: April 27 to October 12 (167 days, 0 WNV)

West Nile in Garfield County

From 1999 to 2025, CDC ArboNET counted 20 human West Nile cases in Garfield County (1 neuroinvasive) across 5 years. The worst was 2003 with 16; the latest was 2021.

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