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Riverton, WY Weather & Growing Conditions

Local forecast, frost dates, hardiness zone and planting guidance for Riverton, a city in Fremont County, Wyoming.

Overnight
49°F
Slight Chance Showers And Thunderstorms
A slight chance of showers and thunderstorms before 3am, then patchy fog. Mostly cloudy, with a low around 49. West wind around 6 mph. Chance of precipitation is 20%.

7-day forecast for Riverton

WhenTempForecastWindPrecip
Overnight 49°F Slight Chance Showers And Thunderstorms 6 mph W 16%
Saturday 72°F Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms 2 to 9 mph NNW 31%
Saturday Night 43°F Chance Showers And Thunderstorms then Showers And Thunderstorms 3 to 12 mph NW 82%
Sunday 65°F Slight Chance Rain Showers then Mostly Cloudy 5 mph N 24%
Sunday Night 42°F Partly Cloudy 1 to 6 mph ENE 7%
Monday 70°F Sunny 1 to 5 mph N 0%
Monday Night 43°F Mostly Clear 5 mph NNW 0%
Tuesday 75°F Mostly Sunny 5 mph NE 1%
Tuesday Night 47°F Chance Showers And Thunderstorms 5 mph WNW 34%
Wednesday 78°F Mostly Sunny 5 mph SSW 9%
Wednesday Night 46°F Mostly Clear 5 mph SW 3%
Thursday 81°F Sunny 3 mph SE 1%
Thursday Night 47°F Mostly Clear 6 mph SSE 1%
Friday 82°F Mostly Sunny 3 mph SW 3%

Forecast source: National Weather Service (api.weather.gov) for Riverton (43.026, -108.381). Updated through the day.

Growing snapshot for Riverton

Last spring frost
May 12
First fall frost
Sep 24
Growing season
132 days
Hardiness zone
5a

More local growing data for Riverton: nearby ZIP 82501 weather · frost dates · planting calendar · Wyoming frost dates

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Climate data from the nearest NOAA station, Riverton, Wy (6.9 mi from Riverton). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.