Great Falls, MT Weather & Growing Conditions
Overnight
43°F
Mostly Clear
Mostly clear, with a low around 43. West southwest wind around 3 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 43°F | Mostly Clear | 3 mph WSW | 0% |
| Tuesday | 78°F | Sunny | 5 mph SW | 0% |
| Tuesday Night | 48°F | Mostly Clear | 8 mph SE | 1% |
| Wednesday | 86°F | Sunny | 6 to 9 mph WSW | 0% |
| Wednesday Night | 52°F | Mostly Clear | 7 mph SW | 0% |
| Thursday | 92°F | Sunny | 10 mph W | 0% |
| Thursday Night | 55°F | Mostly Clear | 6 to 9 mph NE | 0% |
| Friday | 97°F | Sunny | 5 to 17 mph W | 0% |
| Friday Night | 58°F | Mostly Clear | 8 to 15 mph W | 0% |
| Saturday | 94°F | Sunny | 10 mph W | 0% |
| Saturday Night | 57°F | Mostly Clear | 6 to 13 mph NNW | 1% |
| Sunday | 89°F | Sunny | 8 mph NNW | 0% |
| Sunday Night | 56°F | Partly Cloudy | 12 mph NNE | 3% |
| Monday | 87°F | Sunny | 8 mph N | 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 (10.2 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.