Mosquito season in Scotts Bluff County, NE: when it starts and ends

Mosquito months in Scotts Bluff County

In a normal year mosquito season in Scotts Bluff County, NE starts around April 28 and ends around October 12, about 24 weeks.

1. Jan
2. Feb
3. Mar
4. Apr
5. May
6. Jun
7. Jul
8. Aug
9. Sep
10. Oct
11. Nov
12. Dec

What to do in Scotts Bluff County, and when

• Start tipping out standing water weekly by April 14.
• Book any yard treatment for late April, ahead of the July peak.
• Repellent can go away after October 12.
• 50 West Nile cases since 2016: you should wear EPA-registered repellent at dusk July to August, and check NE spray notices.

Scotts Bluff County against the rest of NE

Scotts Bluff County has the 79th longest season of 93 NE counties, at 167 days against 200 in Richardson County and 127 in Sioux County. Its mean temperature is 49.3°F.

• Hooker County: April 28 to October 12 (167 days, 2 WNV)
• McPherson County: April 28 to October 12 (167 days, 0 WNV)
• Chase County: April 29 to October 13 (167 days, 7 WNV)
• Morrill County: April 29 to October 13 (167 days, 12 WNV)

West Nile in Scotts Bluff County

From 1999 to 2025, CDC ArboNET counted 206 human West Nile cases in Scotts Bluff County (51 neuroinvasive) across 22 years. The worst was 2003 with 45; the latest was 2025.

Background: reading the West Nile counts; how the dates are worked out.