Riverton, WY Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Riverton, a city in Fremont County, Wyoming.
This Afternoon
56°F
Sunny
Sunny. High near 56, with temperatures falling to around 50 in the afternoon. East northeast wind around 5 mph.
7-day forecast for Riverton
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 56°F | Sunny | 5 mph ENE | 0% |
| Tonight | 27°F | Patchy Fog | 6 mph NNW | 0% |
| Wednesday | 51°F | Areas Of Fog then Mostly Cloudy | 2 mph N | 0% |
| Wednesday Night | 26°F | Partly Cloudy | 1 to 5 mph SW | 0% |
| Thursday | 54°F | Sunny | 3 mph S | 0% |
| Thursday Night | 30°F | Partly Cloudy | 1 to 6 mph WSW | 4% |
| Friday | 53°F | Sunny | 5 mph SW | 4% |
| Friday Night | 29°F | Mostly Clear | 5 mph SSW | 1% |
| Saturday | 55°F | Sunny | 3 mph SE | 0% |
| Saturday Night | 28°F | Mostly Clear | 1 to 5 mph S | 0% |
| Sunday | 61°F | Sunny | 5 mph SW | 0% |
| Sunday Night | 33°F | Partly Cloudy | 5 mph SSW | 0% |
| Monday | 59°F | Mostly Sunny | 5 mph W | 0% |
| Monday Night | 33°F | Partly Cloudy | 5 mph WSW | 0% |
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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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 Nov 4, 2026.