Mosquito season in Goshen County, WY: when it starts and ends
Mosquito months in Goshen County
In a normal year mosquito season in Goshen County, WY starts around May 9 and ends around October 1, about 21 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Goshen County, and when
- Start tipping out standing water weekly by April 25.
- Book any yard treatment for early May, ahead of the July peak.
- Repellent can go away after October 1.
- 15 West Nile cases since 2016: you should wear EPA-registered repellent at dusk July to July, and check WY spray notices.
Goshen County against the rest of WY
Goshen County has the 8th longest season of 23 WY counties, at 145 days against 163 in Big Horn County and 75 in Teton County. Its mean temperature is 47.5°F.
- Converse County: May 8 to October 1 (146 days, 1 WNV)
- Weston County: May 9 to October 2 (146 days, 0 WNV)
- Laramie County: May 9 to October 1 (145 days, 11 WNV)
- Platte County: May 9 to October 1 (145 days, 6 WNV)
West Nile in Goshen County
From 1999 to 2025, CDC ArboNET counted 141 human West Nile cases in Goshen County (35 neuroinvasive) across 20 years. The worst was 2003 with 88; the latest was 2025.
More: how the dates are worked out · reading the West Nile counts.