Rock River, WY Weather & Growing Conditions
This Afternoon
44°F
Sunny
Sunny. High near 44, with temperatures falling to around 38 in the afternoon. Northwest wind 10 to 15 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 44°F | Sunny | 10 to 15 mph NW | 2% |
| Tonight | 27°F | Partly Cloudy | 5 to 10 mph SW | 0% |
| Wednesday | 46°F | Mostly Cloudy | 0 to 5 mph ESE | 1% |
| Wednesday Night | 27°F | Mostly Cloudy | 0 to 5 mph NW | 1% |
| Thursday | 52°F | Sunny | 5 mph W | 0% |
| Thursday Night | 29°F | Partly Cloudy | 0 to 5 mph WSW | 0% |
| Friday | 50°F | Sunny | 5 to 15 mph W | 1% |
| Friday Night | 28°F | Mostly Clear | 5 to 10 mph W | 3% |
| Saturday | 52°F | Sunny | 5 to 15 mph W | 3% |
| Saturday Night | 29°F | Mostly Clear | 5 mph W | 0% |
| Sunday | 61°F | Sunny | 5 to 15 mph WSW | 0% |
| Sunday Night | 35°F | Mostly Clear | 10 mph WSW | 0% |
| Monday | 60°F | Mostly Sunny | 5 to 10 mph W | 0% |
| Monday Night | 35°F | Partly Cloudy | 5 to 10 mph SW | 0% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Rock River, WY
Last spring frost
May 22
First fall frost
Sep 24
Growing season
125 days
Hardiness zone
4a
Explore more for Rock River, WY: full frost dates · planting calendar · Wyoming frost dates
Climate data from the nearest NOAA station, Sybille Rsch Unit, Wy (18 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.