Mosquito season in Holt County, NE: when it starts and ends
Mosquito months in Holt County
In a normal year mosquito season in Holt County, NE starts around April 25 and ends around October 13, about 24 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Holt County, and when
- Start tipping out standing water weekly by April 11.
- Book any yard treatment for late April, ahead of the July peak.
- Repellent can go away after October 13.
- 12 West Nile cases since 2016: you should wear EPA-registered repellent at dusk July to August, and check NE spray notices.
Holt County against the rest of NE
Holt County has the 66th longest season of 93 NE counties, at 170 days against 200 in Richardson County and 127 in Sioux County. Its mean temperature is 47.7°F.
- Loup County: April 25 to October 13 (171 days, 0 WNV)
- Boyd County: April 26 to October 14 (171 days, 1 WNV)
- Valley County: April 25 to October 12 (170 days, 5 WNV)
- Greeley County: April 25 to October 11 (169 days, 0 WNV)
West Nile in Holt County
From 1999 to 2025, CDC ArboNET counted 70 human West Nile cases in Holt County (15 neuroinvasive) across 16 years. The worst was 2003 with 32; the latest was 2024.
Background: reading the West Nile counts; how the dates are worked out.