Garrison, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Garrison, a community in Powell County, Montana.
Overnight
34°F
Patchy Smoke
Patchy smoke. Mostly clear, with a low around 34. East northeast wind around 1 mph.
7-day forecast for Garrison
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 34°F | Patchy Smoke | 1 mph ENE | 0% |
| Tuesday | 77°F | Patchy Smoke | 0 to 6 mph ENE | 0% |
| Tuesday Night | 41°F | Patchy Smoke then Mostly Clear | 0 to 7 mph NNE | 0% |
| Wednesday | 83°F | Sunny then Patchy Smoke | 1 to 8 mph W | 0% |
| Wednesday Night | 44°F | Patchy Smoke then Mostly Clear | 1 to 8 mph WSW | 0% |
| Thursday | 90°F | Sunny | 1 to 10 mph WSW | 0% |
| Thursday Night | 49°F | Clear | 1 to 9 mph WSW | 0% |
| Friday | 93°F | Sunny | 2 to 13 mph SW | 0% |
| Friday Night | 49°F | Mostly Clear | 5 to 17 mph W | 0% |
| Saturday | 91°F | Sunny | 1 to 12 mph WSW | 0% |
| Saturday Night | 49°F | Mostly Clear | 2 to 13 mph WNW | 0% |
| Sunday | 88°F | Sunny | 1 to 9 mph N | 0% |
| Sunday Night | 48°F | Mostly Clear | 1 to 10 mph NNW | 0% |
| Monday | 87°F | Sunny | 0 to 7 mph NNE | 0% |
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 Aug 4, 2026.