Mosquito season in Madison County, NE: when it starts and ends
Mosquito months in Madison County
In a normal year mosquito season in Madison County, NE starts around April 20 and ends around October 16, about 26 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Madison County, and when
- Start tipping out standing water weekly by April 6.
- Book any yard treatment for mid April, ahead of the July peak.
- Repellent can go away after October 16.
- 18 West Nile cases since 2016: you should wear EPA-registered repellent at dusk June to August, and check NE spray notices.
Madison County against the rest of NE
Madison County has the 47th longest season of 93 NE counties, at 179 days against 200 in Richardson County and 127 in Sioux County. Its mean temperature is 48.6°F.
- Phelps County: April 21 to October 18 (180 days, 5 WNV)
- Knox County: April 20 to October 16 (179 days, 10 WNV)
- Sherman County: April 21 to October 17 (179 days, 2 WNV)
- Nance County: April 20 to October 15 (178 days, 4 WNV)
West Nile in Madison County
From 1999 to 2025, CDC ArboNET counted 58 human West Nile cases in Madison County (19 neuroinvasive) across 18 years. The worst was 2003 with 10; the latest was 2024.
See how the dates are worked out, and reading the West Nile counts.