Mammoth, WY Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Mammoth, a community in Park County, Wyoming.
Today
50°F
Sunny
Sunny. High near 50, with temperatures falling to around 45 in the afternoon. South southeast wind around 3 mph.
7-day forecast for Mammoth
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 50°F | Sunny | 3 mph SSE | 0% |
| Tonight | 29°F | Partly Cloudy | 2 to 6 mph SSE | 0% |
| Wednesday | 55°F | Mostly Sunny | 2 to 7 mph NNW | 0% |
| Wednesday Night | 28°F | Mostly Clear | 3 to 9 mph SSW | 0% |
| Thursday | 48°F | Mostly Sunny then Slight Chance Rain Showers | 8 mph SSW | 16% |
| Thursday Night | 30°F | Slight Chance Rain Showers then Mostly Cloudy | 7 mph SSW | 16% |
| Friday | 46°F | Mostly Sunny | 8 mph SSW | 9% |
| Friday Night | 29°F | Mostly Cloudy | 9 mph S | 9% |
| Saturday | 52°F | Mostly Sunny | 7 mph S | 0% |
| Saturday Night | 31°F | Partly Cloudy | 7 to 12 mph S | 0% |
| Sunday | 56°F | Mostly Sunny | 8 to 12 mph S | 0% |
| Sunday Night | 33°F | Partly Cloudy | 7 to 10 mph S | 1% |
| Monday | 55°F | Mostly Sunny | 7 mph S | 3% |
| Monday Night | 35°F | Partly Cloudy | 6 to 9 mph S | 3% |
Forecast source: National Weather Service (api.weather.gov) for Mammoth (44.973, -110.693). Updated through the day.
Growing snapshot for Mammoth
Last spring frost
May 21
First fall frost
Sep 27
Growing season
128 days
Hardiness zone
4b
More local growing data for Mammoth: nearby ZIP 59030 weather · frost dates · planting calendar · Wyoming frost dates
Climate data from the nearest NOAA station, Gardiner, Mt (6.5 mi from Mammoth). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 3, 2026.