Sun Prairie, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Sun Prairie, a community in Cascade County, Montana.
This Afternoon
74°F
Partly Sunny
Partly sunny, with a high near 74. North northeast wind around 10 mph.
7-day forecast for Sun Prairie
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 74°F | Partly Sunny | 10 mph NNE | 5% |
| Tonight | 51°F | Chance Rain | 3 to 10 mph NNE | 30% |
| Saturday | 67°F | Slight Chance Light Rain then Cloudy | 5 to 8 mph NE | 20% |
| Saturday Night | 47°F | Mostly Cloudy | 2 to 7 mph SSE | 5% |
| Sunday | 75°F | Mostly Sunny | 3 mph S | 2% |
| Sunday Night | 47°F | Mostly Clear | 2 to 6 mph SSE | 0% |
| Monday | 81°F | Sunny | 2 to 6 mph SSW | 0% |
| Monday Night | 49°F | Mostly Clear | 6 mph SSW | 0% |
| Tuesday | 79°F | Sunny | 5 mph WSW | 0% |
| Tuesday Night | 49°F | Mostly Clear | 6 mph SSE | 1% |
| Wednesday | 80°F | Sunny | 3 to 8 mph SW | 1% |
| Wednesday Night | 49°F | Mostly Clear | 6 mph SW | 4% |
| Thursday | 81°F | Sunny | 3 to 7 mph SSW | 1% |
| Thursday Night | 50°F | Partly Cloudy | 7 mph S | 2% |
Forecast source: National Weather Service (api.weather.gov) for Sun Prairie (47.535, -111.488). Updated through the day.
Growing snapshot for Sun Prairie
Last spring frost
Jun 2
First fall frost
Sep 10
Growing season
96 days
Hardiness zone
4a
More local growing data for Sun Prairie: nearby ZIP 59485 weather · frost dates · planting calendar · Montana frost dates
Nearby towns & communities
Belt
Big Stone Colony
Black Eagle
Cascade
Cascade Colony
Centerville
Fair Haven Colony
Fairfield
Fort Shaw
Gibson Flats
Great Falls
Hardy
Malmstrom AFB
Monarch
Neihart
Pleasant Valley Colony
Riceville
Sand Coulee
Simms
Stockett
Sun River
Tracy
Ulm
Vaughn
Climate data from the nearest NOAA station, Sun Rvr 4 S, Mt (8.5 mi from Sun Prairie). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 18, 2026.