Great Falls, MT Weather & Growing Conditions
Overnight
42°F
Mostly Clear
Mostly clear, with a low around 42. West southwest wind around 1 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 42°F | Mostly Clear | 1 mph WSW | 0% |
| Tuesday | 79°F | Sunny | 1 to 5 mph NW | 0% |
| Tuesday Night | 49°F | Mostly Clear | 7 mph SE | 1% |
| Wednesday | 87°F | Sunny | 7 mph WSW | 0% |
| Wednesday Night | 52°F | Mostly Clear | 6 mph SSW | 0% |
| Thursday | 93°F | Sunny | 6 to 9 mph WSW | 0% |
| Thursday Night | 56°F | Mostly Clear | 7 mph E | 0% |
| Friday | 99°F | Sunny | 3 to 15 mph WSW | 0% |
| Friday Night | 58°F | Mostly Clear | 7 to 13 mph W | 0% |
| Saturday | 96°F | Sunny | 8 mph W | 0% |
| Saturday Night | 58°F | Mostly Clear | 3 to 12 mph NW | 1% |
| Sunday | 91°F | Sunny | 5 to 8 mph NW | 0% |
| Sunday Night | 57°F | Partly Cloudy | 5 to 10 mph NNE | 4% |
| Monday | 89°F | Sunny | 3 to 7 mph NNW | 4% |
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 Aug 4, 2026.