Sun Prairie, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Sun Prairie, a community in Cascade County, Montana.
Today
51°F
Mostly Sunny
Mostly sunny. High near 51, with temperatures falling to around 45 in the afternoon. South southwest wind 0 to 3 mph.
7-day forecast for Sun Prairie
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 51°F | Mostly Sunny | 0 to 3 mph SSW | 0% |
| Tonight | 29°F | Mostly Clear | 1 to 9 mph S | 0% |
| Thursday | 56°F | Mostly Sunny | 9 to 18 mph SW | 0% |
| Thursday Night | 34°F | Partly Cloudy | 13 mph SW | 0% |
| Friday | 56°F | Sunny | 10 to 24 mph SW | 1% |
| Friday Night | 40°F | Partly Cloudy | 13 to 23 mph SW | 1% |
| Saturday | 61°F | Mostly Sunny | 7 to 14 mph SW | 1% |
| Saturday Night | 39°F | Partly Cloudy | 7 to 12 mph SSW | 0% |
| Sunday | 63°F | Mostly Sunny | 12 to 23 mph SW | 0% |
| Sunday Night | 37°F | Partly Cloudy | 6 to 14 mph WSW | 0% |
| Monday | 56°F | Mostly Sunny | 7 mph SSW | 1% |
| Monday Night | 37°F | Mostly Cloudy | 5 to 10 mph SSW | 0% |
| Tuesday | 60°F | Mostly Sunny | 10 to 21 mph SW | 0% |
| Tuesday Night | 39°F | Partly Cloudy | 9 to 13 mph SW | 1% |
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 Nov 4, 2026.