Basin, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Basin, a community in Jefferson County, Montana.
This Afternoon
45°F
Mostly Sunny
Mostly sunny. High near 45, with temperatures falling to around 38 in the afternoon. East wind around 5 mph.
7-day forecast for Basin
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 45°F | Mostly Sunny | 5 mph E | 0% |
| Tonight | 27°F | Mostly Cloudy | 5 mph WNW | 0% |
| Wednesday | 45°F | Mostly Sunny | 2 mph N | 0% |
| Wednesday Night | 27°F | Mostly Clear | 1 to 6 mph WSW | 0% |
| Thursday | 42°F | Mostly Sunny | 3 to 7 mph WSW | 6% |
| Thursday Night | 26°F | Mostly Clear | 3 to 8 mph WSW | 6% |
| Friday | 42°F | Mostly Sunny | 8 to 13 mph SW | 8% |
| Friday Night | 30°F | Partly Cloudy | 8 to 18 mph WSW | 8% |
| Saturday | 45°F | Mostly Sunny | 5 to 9 mph SW | 0% |
| Saturday Night | 32°F | Partly Cloudy | 5 to 12 mph SSW | 0% |
| Sunday | 51°F | Mostly Sunny | 8 to 12 mph SW | 2% |
| Sunday Night | 33°F | Partly Cloudy | 6 to 10 mph SW | 2% |
| Monday | 48°F | Partly Sunny | 7 mph SW | 2% |
| Monday Night | 34°F | Mostly Cloudy | 5 to 9 mph SW | 2% |
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 Nov 4, 2026.