Great Falls, MT Weather & Growing Conditions
Today
49°F
Sunny
Sunny. High near 49, with temperatures falling to around 42 in the afternoon. Southwest wind 1 to 5 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 49°F | Sunny | 1 to 5 mph SW | 0% |
| Tonight | 30°F | Mostly Clear | 2 to 13 mph S | 0% |
| Thursday | 54°F | Mostly Sunny | 13 to 20 mph SW | 0% |
| Thursday Night | 34°F | Partly Cloudy | 15 mph SW | 0% |
| Friday | 54°F | Sunny | 15 to 26 mph SW | 1% |
| Friday Night | 40°F | Partly Cloudy | 20 to 25 mph SW | 1% |
| Saturday | 60°F | Mostly Sunny | 7 to 20 mph SW | 1% |
| Saturday Night | 40°F | Partly Cloudy | 7 to 17 mph SSW | 0% |
| Sunday | 62°F | Partly Sunny | 16 to 24 mph SW | 0% |
| Sunday Night | 38°F | Mostly Cloudy | 9 to 16 mph WSW | 0% |
| Monday | 54°F | Mostly Sunny | 5 to 9 mph SW | 1% |
| Monday Night | 37°F | Mostly Cloudy | 5 to 14 mph SSW | 0% |
| Tuesday | 58°F | Mostly Sunny | 14 to 22 mph SW | 1% |
| Tuesday Night | 40°F | Partly Cloudy | 15 mph SW | 1% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Great Falls, MT
Last spring frost
May 6
First fall frost
Oct 1
Growing season
147 days
Hardiness zone
4b
Explore more for Great Falls, MT: full frost dates · planting calendar · Montana frost dates
Climate data from the nearest NOAA station, Great Falls 16St, Mt (10.2 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.