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

Mosquito months in Platte County

In a normal year mosquito season in Platte County, NE starts around April 16 and ends around October 18, about 26 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 Platte County, and when

• Start tipping out standing water weekly by April 2.
• Book any yard treatment for mid April, ahead of the July peak.
• Repellent can go away after October 18.
• 12 West Nile cases since 2016: you should wear EPA-registered repellent at dusk June to August, and check NE spray notices.

Platte County against the rest of NE

Platte County has the 30th longest season of 93 NE counties, at 185 days against 200 in Richardson County and 127 in Sioux County. Its mean temperature is 49.8°F.

• Seward County: April 16 to October 19 (186 days, 11 WNV)
• Merrick County: April 17 to October 20 (186 days, 11 WNV)
• Colfax County: April 17 to October 18 (185 days, 7 WNV)
• Burt County: April 18 to October 19 (184 days, 1 WNV)

West Nile in Platte County

From 1999 to 2025, CDC ArboNET counted 93 human West Nile cases in Platte County (24 neuroinvasive) across 16 years. The worst was 2003 with 38; the latest was 2025.

See how the dates are worked out, and reading the West Nile counts.