Mosquito season in Merrick County, NE: when it starts and ends
Mosquito months in Merrick County
In a normal year mosquito season in Merrick County, NE starts around April 17 and ends around October 20, about 27 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Merrick 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 20.
- 11 West Nile cases since 2016: you should wear EPA-registered repellent at dusk June to August, and check NE spray notices.
Merrick County against the rest of NE
Merrick County has the 29th longest season of 93 NE counties, at 186 days against 200 in Richardson County and 127 in Sioux County. Its mean temperature is 50.4°F.
- Kearney County: April 16 to October 19 (186 days, 11 WNV)
- Seward County: April 16 to October 19 (186 days, 11 WNV)
- Platte County: April 16 to October 18 (185 days, 12 WNV)
- Colfax County: April 17 to October 18 (185 days, 7 WNV)
West Nile in Merrick County
From 1999 to 2025, CDC ArboNET counted 51 human West Nile cases in Merrick County (15 neuroinvasive) across 14 years. The worst was 2003 with 24; the latest was 2024.
More: how the dates are worked out · reading the West Nile counts.