Great Falls, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Great Falls, a city in Cascade County, Montana.
Today
79°F
Sunny
Sunny, with a high near 79. South southwest wind 1 to 5 mph.
7-day forecast for Great Falls
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 79°F | Sunny | 1 to 5 mph SSW | 0% |
| Tonight | 49°F | Mostly Clear | 3 to 7 mph SE | 1% |
| Wednesday | 88°F | Sunny | 7 mph WSW | 0% |
| Wednesday Night | 52°F | Mostly Clear | 6 mph SSW | 0% |
| Thursday | 95°F | Sunny | 5 to 9 mph WSW | 0% |
| Thursday Night | 57°F | Mostly Clear | 3 to 7 mph E | 0% |
| Friday | 99°F | Sunny | 3 to 16 mph WSW | 0% |
| Friday Night | 59°F | Mostly Clear | 6 to 13 mph W | 0% |
| Saturday | 96°F | Sunny | 5 to 8 mph W | 0% |
| Saturday Night | 59°F | Mostly Clear | 2 to 12 mph NW | 1% |
| Sunday | 91°F | Sunny | 3 to 7 mph NW | 0% |
| Sunday Night | 57°F | Partly Cloudy | 5 to 10 mph NNE | 4% |
| Monday | 89°F | Sunny | 2 to 6 mph NNW | 4% |
| Monday Night | 57°F | Mostly Clear | 5 to 9 mph ENE | 9% |
Forecast source: National Weather Service (api.weather.gov) for Great Falls (47.503, -111.300). Updated through the day.
Growing snapshot for Great Falls
Last spring frost
May 6
First fall frost
Oct 1
Growing season
147 days
Hardiness zone
4b
More local growing data for Great Falls: nearby ZIP 59401 weather · frost dates · planting calendar · Montana frost dates
Nearby towns & communities
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Gibson Flats
Hardy
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Monarch
Neihart
Pleasant Valley Colony
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Simms
Stockett
Sun Prairie
Sun River
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Ulm
Vaughn
Climate data from the nearest NOAA station, Great Falls 16St, Mt (1.6 mi from Great Falls). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.