Sun River, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Sun River, a community in Cascade County, Montana.
Today
79°F
Sunny
Sunny, with a high near 79. Southeast wind 1 to 6 mph.
7-day forecast for Sun River
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 79°F | Sunny | 1 to 6 mph SE | 0% |
| Tonight | 47°F | Mostly Clear | 3 to 8 mph SE | 1% |
| Wednesday | 87°F | Sunny | 6 mph WSW | 0% |
| Wednesday Night | 50°F | Mostly Clear | 7 mph W | 0% |
| Thursday | 95°F | Sunny | 5 to 8 mph WNW | 0% |
| Thursday Night | 54°F | Mostly Clear | 5 to 10 mph NNW | 0% |
| Friday | 99°F | Sunny | 3 to 20 mph W | 0% |
| Friday Night | 55°F | Mostly Clear | 8 to 20 mph WNW | 0% |
| Saturday | 95°F | Sunny | 5 to 12 mph W | 0% |
| Saturday Night | 55°F | Mostly Clear | 6 to 15 mph NW | 0% |
| Sunday | 90°F | Sunny | 5 to 9 mph NW | 0% |
| Sunday Night | 55°F | Partly Cloudy | 8 to 13 mph N | 2% |
| Monday | 88°F | Sunny | 5 to 8 mph N | 4% |
| Monday Night | 54°F | Mostly Clear | 10 mph NNE | 6% |
Forecast source: National Weather Service (api.weather.gov) for Sun River (47.531, -111.724). Updated through the day.
Growing snapshot for Sun River
Last spring frost
Jun 2
First fall frost
Sep 10
Growing season
96 days
Hardiness zone
4a
More local growing data for Sun River: nearby ZIP 59483 weather · frost dates · planting calendar · Montana frost dates
Nearby towns & communities
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Big Stone Colony
Black Eagle
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Fair Haven Colony
Fairfield
Fort Shaw
Gibson Flats
Great Falls
Hardy
Malmstrom AFB
Monarch
Neihart
Pleasant Valley Colony
Riceville
Sand Coulee
Simms
Stockett
Sun Prairie
Tracy
Ulm
Vaughn
Climate data from the nearest NOAA station, Sun Rvr 4 S, Mt (0.9 mi from Sun River). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.