Great Falls, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Great Falls, a city in Cascade County, Montana.
Today
50°F
Sunny
Sunny. High near 50, with temperatures falling to around 45 in the afternoon. Southwest wind 0 to 5 mph.
7-day forecast for Great Falls
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 50°F | Sunny | 0 to 5 mph SW | 0% |
| Tonight | 32°F | Mostly Clear | 1 to 9 mph S | 0% |
| Thursday | 56°F | Mostly Sunny | 9 to 17 mph SW | 0% |
| Thursday Night | 36°F | Partly Cloudy | 10 to 14 mph SW | 0% |
| Friday | 56°F | Sunny | 10 to 23 mph SW | 1% |
| Friday Night | 42°F | Partly Cloudy | 13 to 22 mph SW | 1% |
| Saturday | 62°F | Mostly Sunny | 6 to 13 mph SW | 1% |
| Saturday Night | 42°F | Partly Cloudy | 6 to 12 mph SSW | 0% |
| Sunday | 63°F | Partly Sunny | 12 to 21 mph SW | 1% |
| Sunday Night | 39°F | Partly Cloudy | 5 to 13 mph WSW | 1% |
| Monday | 56°F | Mostly Sunny | 2 to 6 mph SW | 1% |
| Monday Night | 39°F | Mostly Cloudy | 2 to 9 mph SSW | 0% |
| Tuesday | 60°F | Mostly Sunny | 9 to 20 mph SW | 1% |
| Tuesday Night | 41°F | Partly Cloudy | 9 to 13 mph SW | 1% |
Forecast source: National Weather Service (api.weather.gov) for Great Falls (47.503, -111.300). Updated through the day.
Growing snapshot for Great Falls
Last spring frost
May 6
First fall frost
Oct 1
Growing season
147 days
Hardiness zone
4b
More local growing data for Great Falls: nearby ZIP 59401 weather · frost dates · planting calendar · Montana frost dates
Nearby towns & communities
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Gibson Flats
Hardy
Malmstrom AFB
Monarch
Neihart
Pleasant Valley Colony
Riceville
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Stockett
Sun Prairie
Sun River
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Ulm
Vaughn
Climate data from the nearest NOAA station, Great Falls 16St, Mt (1.6 mi from Great Falls). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.