Mammoth, WY Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Mammoth, a community in Park County, Wyoming.
Tonight
49°F
Isolated Showers And Thunderstorms
Isolated showers and thunderstorms before 1am, then scattered showers and thunderstorms between 1am and 4am, then isolated showers and thunderstorms between 4am and 5am, then scattered showers and thunderstorms. Mostly cloudy. Low around 49, with temperatures rising to around 52 overnight. Southwest wind around 3 mph. Chance of precipitation is 40%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast for Mammoth
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 49°F | Isolated Showers And Thunderstorms | 3 mph SW | 35% |
| Saturday | 57°F | Scattered Showers And Thunderstorms | 1 to 5 mph WNW | 56% |
| Saturday Night | 46°F | Chance Showers And Thunderstorms | 6 mph NW | 54% |
| Sunday | 64°F | Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms | 1 to 5 mph W | 18% |
| Sunday Night | 44°F | Partly Cloudy | 5 mph SW | 3% |
| Monday | 71°F | Mostly Sunny | 3 mph SSW | 1% |
| Monday Night | 46°F | Mostly Clear | 5 mph SSW | 1% |
| Tuesday | 73°F | Mostly Sunny | 5 mph S | 1% |
| Tuesday Night | 47°F | Partly Cloudy | 5 mph SSW | 7% |
| Wednesday | 73°F | Sunny | 6 mph SSW | 7% |
| Wednesday Night | 47°F | Mostly Clear | 7 mph SSW | 4% |
| Thursday | 75°F | Sunny | 5 mph S | 3% |
| Thursday Night | 48°F | Partly Cloudy | 3 to 7 mph S | 1% |
| Friday | 75°F | Mostly Sunny | 6 mph S | 2% |
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 Sep 19, 2026.