Mosquito season in Boone County, NE: when it starts and ends
Mosquito months in Boone County
In a normal year mosquito season in Boone County, NE starts around April 22 and ends around October 15, about 25 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Boone County, and when
- Start tipping out standing water weekly by April 8.
- Book any yard treatment for late April, ahead of the July peak.
- Repellent can go away after October 15.
- 7 West Nile cases since 2016 (last 2025): you should use repellent at dusk July to August, more so if over 60.
Boone County against the rest of NE
Boone County has the 56th longest season of 93 NE counties, at 176 days against 200 in Richardson County and 127 in Sioux County. Its mean temperature is 48.3°F.
- Keith County: April 22 to October 17 (178 days, 9 WNV)
- Webster County: April 22 to October 16 (177 days, 2 WNV)
- Cedar County: April 22 to October 15 (176 days, 4 WNV)
- Wheeler County: April 25 to October 17 (175 days, 0 WNV)
West Nile in Boone County
From 1999 to 2025, CDC ArboNET counted 53 human West Nile cases in Boone County (10 neuroinvasive) across 16 years. The worst was 2003 with 24; the latest was 2025.
See how the dates are worked out, and reading the West Nile counts.