Mammoth, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Mammoth, a community in Madison County, Montana.
Today
67°F
Patchy Smoke
Patchy smoke. Sunny, with a high near 67. North northeast wind around 7 mph.
7-day forecast for Mammoth
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 67°F | Patchy Smoke | 7 mph NNE | 0% |
| Tonight | 47°F | Patchy Smoke | 2 to 6 mph S | 1% |
| Wednesday | 75°F | Patchy Smoke | 3 to 7 mph W | 0% |
| Wednesday Night | 52°F | Patchy Smoke then Mostly Clear | 3 to 8 mph WSW | 0% |
| Thursday | 82°F | Sunny | 6 to 9 mph WSW | 0% |
| Thursday Night | 57°F | Clear | 3 to 10 mph WSW | 0% |
| Friday | 85°F | Sunny | 6 to 16 mph WSW | 1% |
| Friday Night | 58°F | Mostly Clear | 6 to 16 mph W | 0% |
| Saturday | 83°F | Sunny | 6 to 14 mph WSW | 1% |
| Saturday Night | 57°F | Mostly Clear | 2 to 13 mph W | 2% |
| Sunday | 81°F | Sunny | 2 to 10 mph W | 2% |
| Sunday Night | 55°F | Mostly Clear | 3 to 10 mph N | 6% |
| Monday | 80°F | Sunny | 3 to 8 mph NNW | 1% |
| Monday Night | 55°F | Partly Cloudy | 3 to 10 mph NE | 7% |
Forecast source: National Weather Service (api.weather.gov) for Mammoth (45.669, -112.018). Updated through the day.
Growing snapshot for Mammoth
Last spring frost
Jun 8
First fall frost
Sep 2
Growing season
82 days
Hardiness zone
5a
More local growing data for Mammoth: nearby ZIP 59747 weather · frost dates · planting calendar · Montana frost dates
Nearby towns & communities
Alder
Big Sky
Brandon
Ennis
Harrison
Jeffers
McAllister
Norris
Pony
Sheridan
Silver Star
Twin Bridges
Virginia City
Climate data from the nearest NOAA station, Twin Bridges, Mt (20.4 mi from Mammoth). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.