Mosquito season in Colfax County, NE: when it starts and ends
Mosquito months in Colfax County
In a normal year mosquito season in Colfax County, NE starts around April 17 and ends around October 18, about 26 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Colfax County, and when
- Start tipping out standing water weekly by April 3.
- Book any yard treatment for mid April, ahead of the July peak.
- Repellent can go away after October 18.
- 7 West Nile cases since 2016 (last 2024): you should use repellent at dusk June to August, more so if over 60.
Colfax County against the rest of NE
Colfax County has the 31st longest season of 93 NE counties, at 185 days against 200 in Richardson County and 127 in Sioux County. Its mean temperature is 49.7°F.
- Merrick County: April 17 to October 20 (186 days, 11 WNV)
- Platte County: April 16 to October 18 (185 days, 12 WNV)
- Burt County: April 18 to October 19 (184 days, 1 WNV)
- Dawson County: April 18 to October 18 (184 days, 14 WNV)
West Nile in Colfax County
From 1999 to 2025, CDC ArboNET counted 29 human West Nile cases in Colfax County (7 neuroinvasive) across 11 years. The worst was 2003 with 11; the latest was 2024.
See how the dates are worked out, and reading the West Nile counts.