Garrison, MT Weather & Growing Conditions
Overnight
47°F
Showers And Thunderstorms
Showers and thunderstorms. Cloudy, with a low around 47. North northeast wind around 5 mph. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 47°F | Showers And Thunderstorms | 5 mph NNE | 87% |
| Saturday | 59°F | Showers And Thunderstorms | 6 mph NE | 78% |
| Saturday Night | 41°F | Mostly Cloudy | 3 mph ENE | 9% |
| Sunday | 67°F | Patchy Fog then Sunny | 3 mph SW | 0% |
| Sunday Night | 43°F | Mostly Clear | 5 mph SSW | 0% |
| Monday | 71°F | Sunny | 2 to 6 mph SSW | 0% |
| Monday Night | 45°F | Mostly Clear | 5 mph SW | 0% |
| Tuesday | 71°F | Sunny | 1 to 5 mph SSW | 0% |
| Tuesday Night | 45°F | Mostly Clear | 3 mph SE | 2% |
| Wednesday | 71°F | Sunny | 6 mph SSW | 2% |
| Wednesday Night | 45°F | Mostly Clear | 5 mph SE | 3% |
| Thursday | 73°F | Sunny | 6 mph SSE | 0% |
| Thursday Night | 47°F | Partly Cloudy | 3 to 8 mph SSE | 1% |
| Friday | 73°F | Mostly Sunny | 8 mph S | 1% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Garrison, MT
Growing season
65 days
Hardiness zone
4b
Explore more for Garrison, MT: full frost dates · planting calendar · Montana frost dates
Climate data from the nearest NOAA station, Deer Lodge 3 W, Mt (13.1 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.