Basin, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Basin, a community in Jefferson County, Montana.
Tonight
46°F
Showers And Thunderstorms
Showers and thunderstorms. Cloudy, with a low around 46. North northeast wind 6 to 9 mph. Chance of precipitation is 100%. New rainfall amounts between three quarters and one inch possible.
7-day forecast for Basin
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 46°F | Showers And Thunderstorms | 6 to 9 mph NNE | 97% |
| Saturday | 50°F | Showers And Thunderstorms | 6 to 9 mph NE | 95% |
| Saturday Night | 42°F | Chance Light Rain | 5 mph NNW | 42% |
| Sunday | 62°F | Mostly Sunny | 2 to 6 mph WNW | 3% |
| Sunday Night | 42°F | Mostly Clear | 5 mph SW | 0% |
| Monday | 67°F | Sunny | 3 to 7 mph WSW | 0% |
| Monday Night | 44°F | Mostly Clear | 5 mph W | 0% |
| Tuesday | 67°F | Sunny | 2 to 6 mph WSW | 1% |
| Tuesday Night | 45°F | Mostly Clear | 5 mph W | 4% |
| Wednesday | 67°F | Sunny | 3 to 8 mph SW | 2% |
| Wednesday Night | 45°F | Mostly Clear | 2 to 6 mph SW | 2% |
| Thursday | 69°F | Sunny | 5 to 8 mph SSW | 1% |
| Thursday Night | 47°F | Mostly Clear | 7 mph S | 3% |
| Friday | 69°F | Mostly Sunny | 9 mph SSW | 1% |
Forecast source: National Weather Service (api.weather.gov) for Basin (46.283, -112.287). Updated through the day.
Growing snapshot for Basin
Last spring frost
Jun 7
First fall frost
Sep 8
Growing season
90 days
Hardiness zone
5a
More local growing data for Basin: nearby ZIP 59631 weather · frost dates · planting calendar · Montana frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Boulder, Mt (13.8 mi from Basin). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.