Basin, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Basin, a community in Jefferson County, Montana.
Overnight
40°F
Patchy Smoke
Patchy smoke. Mostly clear, with a low around 40. East wind around 1 mph.
7-day forecast for Basin
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 40°F | Patchy Smoke | 1 mph E | 0% |
| Tuesday | 69°F | Patchy Smoke | 1 to 7 mph ENE | 0% |
| Tuesday Night | 45°F | Patchy Smoke then Mostly Clear | 2 to 7 mph NW | 1% |
| Wednesday | 76°F | Sunny then Patchy Smoke | 3 to 8 mph W | 0% |
| Wednesday Night | 48°F | Patchy Smoke then Mostly Clear | 3 to 8 mph W | 0% |
| Thursday | 83°F | Sunny | 5 to 10 mph W | 0% |
| Thursday Night | 54°F | Mostly Clear | 3 to 10 mph WNW | 0% |
| Friday | 85°F | Sunny | 5 to 16 mph WSW | 1% |
| Friday Night | 55°F | Mostly Clear | 6 to 15 mph WNW | 0% |
| Saturday | 83°F | Sunny | 3 to 12 mph W | 0% |
| Saturday Night | 54°F | Mostly Clear | 3 to 13 mph WNW | 1% |
| Sunday | 81°F | Sunny | 3 to 9 mph WNW | 1% |
| Sunday Night | 52°F | Mostly Clear | 3 to 9 mph NNW | 1% |
| Monday | 80°F | Sunny | 2 to 8 mph N | 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 Aug 4, 2026.