Great Falls, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Great Falls, a city in Cascade County, Montana.
This Afternoon
50°F
Sunny
Sunny. High near 50, with temperatures falling to around 44 in the afternoon. Northwest wind around 2 mph.
7-day forecast for Great Falls
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 50°F | Sunny | 2 mph NW | 0% |
| Tonight | 32°F | Mostly Clear | 0 to 9 mph S | 0% |
| Thursday | 55°F | Mostly Sunny | 10 to 18 mph SW | 1% |
| Thursday Night | 36°F | Mostly Clear | 13 mph SW | 0% |
| Friday | 55°F | Sunny | 12 to 23 mph SW | 0% |
| Friday Night | 43°F | Partly Cloudy | 13 to 23 mph SW | 3% |
| Saturday | 62°F | Mostly Sunny | 6 to 14 mph SW | 3% |
| Saturday Night | 43°F | Partly Cloudy | 6 to 13 mph SSW | 0% |
| Sunday | 66°F | Partly Sunny | 13 to 22 mph SW | 0% |
| Sunday Night | 40°F | Mostly Cloudy | 5 to 13 mph WSW | 1% |
| Monday | 56°F | Partly Sunny | 6 mph SW | 1% |
| Monday Night | 40°F | Mostly Cloudy | 3 to 10 mph SSW | 0% |
| Tuesday | 60°F | Mostly Sunny | 10 to 20 mph SW | 1% |
| Tuesday Night | 42°F | Partly Cloudy | 14 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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Big Stone Colony
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Fairfield
Fort Shaw
Gibson Flats
Hardy
Malmstrom AFB
Monarch
Neihart
Pleasant Valley Colony
Riceville
Sand Coulee
Simms
Stockett
Sun Prairie
Sun River
Tracy
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.