Basin, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Basin, a community in Jefferson County, Montana.
Today
49°F
Showers And Thunderstorms
Showers and thunderstorms. Cloudy, with a high near 49. East northeast wind around 8 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast for Basin
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 49°F | Showers And Thunderstorms | 8 mph ENE | 100% |
| Tonight | 39°F | Chance Light Rain then Mostly Cloudy | 1 to 5 mph NNE | 25% |
| Sunday | 62°F | Mostly Sunny | 2 to 6 mph WNW | 0% |
| Sunday Night | 41°F | Mostly Clear | 3 mph SW | 0% |
| Monday | 67°F | Sunny | 3 to 7 mph SW | 0% |
| Monday Night | 44°F | Mostly Clear | 5 mph WSW | 0% |
| Tuesday | 67°F | Sunny | 6 mph SW | 1% |
| Tuesday Night | 45°F | Mostly Clear | 3 mph W | 1% |
| Wednesday | 68°F | Sunny | 2 to 7 mph SSW | 2% |
| Wednesday Night | 46°F | Mostly Clear | 6 mph SSW | 4% |
| Thursday | 69°F | Sunny | 6 to 9 mph SSW | 3% |
| Thursday Night | 46°F | Mostly Clear | 7 mph SSW | 5% |
| Friday | 68°F | Mostly Sunny | 6 to 9 mph SSW | 7% |
| Friday Night | 42°F | Slight Chance Light Rain then Partly Cloudy | 8 mph W | 17% |
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.