Garrison, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Garrison, a community in Powell County, Montana.
This Afternoon
51°F
Mostly Sunny
Mostly sunny. High near 51, with temperatures falling to around 43 in the afternoon. North northwest wind around 1 mph.
7-day forecast for Garrison
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 51°F | Mostly Sunny | 1 mph NNW | 0% |
| Tonight | 25°F | Mostly Cloudy | 1 mph NNE | 0% |
| Wednesday | 49°F | Mostly Sunny | 1 mph N | 0% |
| Wednesday Night | 24°F | Mostly Clear | 1 mph S | 0% |
| Thursday | 50°F | Mostly Sunny | 1 to 5 mph W | 6% |
| Thursday Night | 24°F | Partly Cloudy | 6 mph WSW | 6% |
| Friday | 51°F | Mostly Sunny | 3 to 7 mph SW | 11% |
| Friday Night | 27°F | Mostly Cloudy | 7 to 14 mph WSW | 11% |
| Saturday | 53°F | Mostly Sunny | 1 to 7 mph SW | 1% |
| Saturday Night | 29°F | Partly Cloudy | 1 to 7 mph S | 1% |
| Sunday | 60°F | Mostly Sunny | 3 to 7 mph SSW | 8% |
| Sunday Night | 30°F | Mostly Cloudy | 5 mph WSW | 9% |
| Monday | 55°F | Partly Sunny | 2 mph WSW | 5% |
| Monday Night | 30°F | Mostly Cloudy | 3 mph SW | 3% |
Forecast source: National Weather Service (api.weather.gov) for Garrison (46.540, -112.817). Updated through the day.
Growing snapshot for Garrison
Growing season
65 days
Hardiness zone
4b
More local growing data for Garrison: nearby ZIP 59731 weather · frost dates · planting calendar · Montana frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Deer Lodge 3 W, Mt (13.1 mi from Garrison). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.