Great Falls, MT Weather & Growing Conditions
Today
68°F
Cloudy
Cloudy, with a high near 68. Northeast wind around 9 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 68°F | Cloudy | 9 mph NE | 6% |
| Tonight | 46°F | Mostly Cloudy | 3 to 8 mph SSE | 2% |
| Sunday | 73°F | Mostly Sunny | 5 mph SSE | 0% |
| Sunday Night | 46°F | Mostly Clear | 3 to 7 mph SSE | 0% |
| Monday | 79°F | Sunny | 7 mph SSW | 0% |
| Monday Night | 48°F | Mostly Clear | 7 mph SSW | 0% |
| Tuesday | 79°F | Sunny | 5 to 8 mph WSW | 0% |
| Tuesday Night | 49°F | Mostly Clear | 7 mph SSW | 0% |
| Wednesday | 80°F | Sunny | 7 mph SW | 1% |
| Wednesday Night | 50°F | Mostly Clear | 7 mph SSW | 4% |
| Thursday | 80°F | Sunny | 8 mph SW | 2% |
| Thursday Night | 50°F | Partly Cloudy | 7 mph SSE | 8% |
| Friday | 77°F | Mostly Sunny | 6 to 10 mph SW | 7% |
| Friday Night | 47°F | Chance Light Rain | 9 mph NNW | 28% |
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 Sep 19, 2026.