Mosquito season in Phelps County, NE: when it starts and ends
Mosquito months in Phelps County
In a normal year mosquito season in Phelps County, NE starts around April 21 and ends around October 18, about 26 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Phelps County, and when
- Start tipping out standing water weekly by April 7.
- Book any yard treatment for late April, ahead of the July peak.
- Repellent can go away after October 18.
- 5 West Nile cases since 2016 (last 2022): you should use repellent at dusk June to August, more so if over 60.
Phelps County against the rest of NE
Phelps County has the 45th longest season of 93 NE counties, at 180 days against 200 in Richardson County and 127 in Sioux County. Its mean temperature is 50.1°F.
- Red Willow County: April 21 to October 19 (181 days, 8 WNV)
- Dakota County: April 19 to October 16 (180 days, 3 WNV)
- Knox County: April 20 to October 16 (179 days, 10 WNV)
- Madison County: April 20 to October 16 (179 days, 18 WNV)
West Nile in Phelps County
From 1999 to 2025, CDC ArboNET counted 76 human West Nile cases in Phelps County (9 neuroinvasive) across 13 years. The worst was 2003 with 42; the latest was 2022.
Background: reading the West Nile counts; how the dates are worked out.