Rock River, WY Weather & Growing Conditions
Overnight
47°F
Slight Chance Rain Showers
A slight chance of rain showers before 3am. Mostly cloudy, with a low around 47. South southwest wind 5 to 10 mph. Chance of precipitation is 20%.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 47°F | Slight Chance Rain Showers | 5 to 10 mph SSW | 16% |
| Saturday | 66°F | Showers And Thunderstorms Likely | 5 to 10 mph WSW | 61% |
| Saturday Night | 41°F | Showers And Thunderstorms Likely | 5 to 10 mph SW | 60% |
| Sunday | 59°F | Chance Rain Showers then Slight Chance Showers And Thunderstorms | 10 to 20 mph W | 38% |
| Sunday Night | 38°F | Partly Cloudy | 5 to 15 mph W | 6% |
| Monday | 66°F | Sunny | 5 to 10 mph WNW | 1% |
| Monday Night | 42°F | Mostly Clear | 10 mph SE | 0% |
| Tuesday | 72°F | Sunny | 5 to 10 mph SW | 7% |
| Tuesday Night | 44°F | Partly Cloudy | 5 to 10 mph SSE | 9% |
| Wednesday | 70°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 5 to 15 mph SW | 18% |
| Wednesday Night | 43°F | Partly Cloudy | 5 to 15 mph SW | 5% |
| Thursday | 73°F | Sunny | 5 to 10 mph WNW | 3% |
| Thursday Night | 45°F | Partly Cloudy | 5 to 10 mph SE | 4% |
| Friday | 75°F | Mostly Sunny | 5 to 10 mph SSW | 9% |
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 Sep 19, 2026.