Great Falls, MT Weather & Growing Conditions
This Afternoon
74°F
Mostly Cloudy
Mostly cloudy, with a high near 74. Northeast wind around 9 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 74°F | Mostly Cloudy | 9 mph NE | 6% |
| Tonight | 52°F | Chance Rain | 2 to 9 mph NE | 35% |
| Saturday | 66°F | Slight Chance Light Rain | 3 to 8 mph NE | 24% |
| Saturday Night | 49°F | Mostly Cloudy | 2 to 7 mph SSE | 7% |
| Sunday | 75°F | Mostly Sunny | 2 mph S | 2% |
| Sunday Night | 49°F | Mostly Clear | 6 mph SE | 0% |
| Monday | 80°F | Sunny | 5 mph SSW | 0% |
| Monday Night | 51°F | Mostly Clear | 2 to 6 mph SSW | 0% |
| Tuesday | 79°F | Sunny | 6 mph WSW | 0% |
| Tuesday Night | 51°F | Mostly Clear | 5 mph SSE | 1% |
| Wednesday | 80°F | Sunny | 7 mph SW | 1% |
| Wednesday Night | 52°F | Mostly Clear | 5 mph SSW | 3% |
| Thursday | 81°F | Sunny | 6 mph SSW | 2% |
| Thursday Night | 53°F | Partly Cloudy | 6 mph SSE | 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 Sep 19, 2026.