Rock Springs, WY Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Rock Springs, a city in Sweetwater County, Wyoming.
This Afternoon
70°F
Showers And Thunderstorms Likely
Showers and thunderstorms likely before 3pm, then a chance of showers and thunderstorms between 3pm and 4pm, then showers and thunderstorms likely. Some of the storms could be severe. Partly sunny, with a high near 70. West northwest wind around 9 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast for Rock Springs
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 70°F | Showers And Thunderstorms Likely | 9 mph WNW | 63% |
| Tonight | 44°F | Chance Showers And Thunderstorms | 2 to 8 mph SW | 63% |
| Saturday | 66°F | Patchy Fog | 3 to 12 mph WSW | 43% |
| Saturday Night | 39°F | Slight Chance Showers And Thunderstorms then Mostly Cloudy | 3 to 10 mph WSW | 14% |
| Sunday | 66°F | Mostly Sunny | 3 to 8 mph W | 1% |
| Sunday Night | 39°F | Mostly Clear | 1 to 7 mph SE | 0% |
| Monday | 72°F | Sunny | 3 mph SSW | 0% |
| Monday Night | 44°F | Partly Cloudy | 3 mph SSW | 1% |
| Tuesday | 74°F | Mostly Sunny | 5 mph S | 9% |
| Tuesday Night | 44°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 5 mph SW | 20% |
| Wednesday | 73°F | Mostly Sunny | 2 to 7 mph SW | 9% |
| Wednesday Night | 44°F | Mostly Clear | 5 mph SW | 5% |
| Thursday | 74°F | Mostly Sunny | 1 to 5 mph SE | 3% |
| Thursday Night | 46°F | Partly Cloudy | 5 mph SSE | 8% |
Forecast source: National Weather Service (api.weather.gov) for Rock Springs (41.595, -109.221). Updated through the day.
Growing snapshot for Rock Springs
Last spring frost
May 24
First fall frost
Sep 24
Growing season
121 days
Hardiness zone
5a
More local growing data for Rock Springs: nearby ZIP 82943 weather · frost dates · planting calendar · Wyoming frost dates
Nearby towns & communities
Arrowhead Springs
Bairoil
Clearview Acres
Eden
Farson
Granger
Green River
James Town
Little America
McKinnon
North Rock Springs
Point of Rocks
Purple Sage
Reliance
Superior
Table Rock
Wamsutter
Climate data from the nearest NOAA station, Rock Springs Fire Dept, Wy (9 mi from Rock Springs). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 18, 2026.