Mammoth, MT Weather & Growing Conditions
Today
62°F
Patchy Smoke
Patchy smoke. Sunny, with a high near 62. Northeast wind around 7 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 62°F | Patchy Smoke | 7 mph NE | 0% |
| Tonight | 46°F | Patchy Smoke | 7 mph SSE | 1% |
| Wednesday | 70°F | Patchy Smoke | 3 to 8 mph W | 0% |
| Wednesday Night | 51°F | Patchy Smoke then Mostly Clear | 6 to 9 mph WSW | 0% |
| Thursday | 75°F | Sunny | 7 to 10 mph WSW | 0% |
| Thursday Night | 56°F | Mostly Clear | 6 to 12 mph WSW | 0% |
| Friday | 79°F | Sunny | 8 to 18 mph WSW | 1% |
| Friday Night | 58°F | Mostly Clear | 9 to 21 mph W | 0% |
| Saturday | 78°F | Sunny | 7 to 15 mph WSW | 1% |
| Saturday Night | 57°F | Mostly Clear | 3 to 16 mph WSW | 2% |
| Sunday | 76°F | Sunny | 3 to 12 mph NW | 2% |
| Sunday Night | 55°F | Partly Cloudy | 5 to 13 mph WNW | 6% |
| Monday | 74°F | Sunny | 3 to 9 mph NW | 1% |
| Monday Night | 55°F | Partly Cloudy | 6 to 12 mph NW | 7% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Mammoth, MT
Last spring frost
Jun 8
First fall frost
Sep 2
Growing season
82 days
Hardiness zone
5a
Explore more for Mammoth, MT: full frost dates · planting calendar · Montana frost dates
Climate data from the nearest NOAA station, Twin Bridges, Mt (20.4 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.