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Powder Horn, WY Weather & Growing Conditions

Local forecast, frost dates, hardiness zone and planting guidance for Powder Horn, a community in Sheridan County, Wyoming.

Today
64°F
Isolated Showers And Thunderstorms then Showers And Thunderstorms
Isolated showers and thunderstorms before 9am, then showers and thunderstorms. Mostly cloudy. High near 64, with temperatures falling to around 61 in the afternoon. Northwest wind 3 to 7 mph. Chance of precipitation is 90%.

7-day forecast for Powder Horn

WhenTempForecastWindPrecip
Today 64°F Isolated Showers And Thunderstorms then Showers And Thunderstorms 3 to 7 mph NW 85%
Tonight 46°F Patchy Fog 1 to 8 mph WNW 86%
Sunday 63°F Showers And Thunderstorms 1 to 7 mph NW 75%
Sunday Night 43°F Chance Rain Showers then Areas Of Fog 0 to 5 mph NNW 40%
Monday 71°F Mostly Sunny 0 to 6 mph NE 14%
Monday Night 45°F Mostly Clear 6 mph S 1%
Tuesday 78°F Sunny 0 to 5 mph NNE 2%
Tuesday Night 49°F Mostly Clear then Slight Chance Rain Showers 1 to 5 mph S 16%
Wednesday 79°F Mostly Sunny 5 mph NW 14%
Wednesday Night 49°F Mostly Clear 2 to 6 mph SSW 6%
Thursday 83°F Sunny 6 mph SE 2%
Thursday Night 50°F Mostly Clear 5 to 9 mph S 1%
Friday 83°F Mostly Sunny 5 mph SSE 5%
Friday Night 50°F Partly Cloudy 2 to 8 mph SSW 10%

Forecast source: National Weather Service (api.weather.gov) for Powder Horn (44.691, -106.973). Updated through the day.

Growing snapshot for Powder Horn

Last spring frost
May 24
First fall frost
Sep 23
Growing season
120 days
Hardiness zone
5a

More local growing data for Powder Horn: nearby ZIP 82842 weather · frost dates · planting calendar · Wyoming frost dates

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Climate data from the nearest NOAA station, Story, Wy (1.7 mi from Powder Horn). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.