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
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| 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
Nearby towns & communities
Arapahoe
Atlantic City
Boulder Flats
Crowheart
Dubois
Ethete
Fort Washakie
Hudson
Jeffrey City
Johnstown
Lander
Pavillion
Shoshoni
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.