Riverton, WY Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Riverton, a city in Fremont County, Wyoming.
Today
72°F
Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms
Patchy fog before 9am, then a slight chance of showers and thunderstorms between 9am and noon, then a chance of showers and thunderstorms between noon and 1pm, then a slight chance of showers and thunderstorms between 1pm and 2pm, then a chance of showers and thunderstorms between 2pm and 3pm, then a slight chance of showers and thunderstorms between 3pm and 5pm, then a chance of showers and thunderstorms. Mostly sunny. High near 72, with temperatures falling to around 69 in the afternoon. North northwest wind 3 to 9 mph. Chance of precipitation is 30%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast for Riverton
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 72°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 3 to 9 mph NNW | 31% |
| Tonight | 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% |
| Friday Night | 48°F | Partly Cloudy | 8 mph SW | 6% |
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.