Great Falls, MT Weather & Growing Conditions
This Afternoon
57°F
Mostly Sunny
Mostly sunny. High near 57, with temperatures falling to around 49 in the afternoon. South southeast wind 2 to 7 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 57°F | Mostly Sunny | 2 to 7 mph SSE | 0% |
| Tonight | 30°F | Mostly Cloudy | 5 mph SW | 0% |
| Wednesday | 50°F | Mostly Sunny | 0 to 5 mph W | 0% |
| Wednesday Night | 31°F | Mostly Clear | 0 to 6 mph SSW | 0% |
| Thursday | 56°F | Mostly Sunny | 6 to 16 mph SW | 0% |
| Thursday Night | 35°F | Mostly Clear | 14 mph SW | 0% |
| Friday | 55°F | Mostly Sunny | 12 to 23 mph SW | 1% |
| Friday Night | 38°F | Partly Cloudy | 14 to 23 mph SW | 4% |
| Saturday | 56°F | Mostly Sunny | 6 to 16 mph SW | 0% |
| Saturday Night | 39°F | Partly Cloudy | 6 to 14 mph SW | 0% |
| Sunday | 62°F | Partly Sunny | 13 to 18 mph SW | 0% |
| Sunday Night | 39°F | Mostly Cloudy | 7 to 13 mph SW | 1% |
| Monday | 56°F | Partly Sunny | 3 to 7 mph SW | 2% |
| Monday Night | 39°F | Mostly Cloudy | 3 to 10 mph SSW | 2% |
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 (1.6 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.