Mammoth Hotel Dining Room

The First 4-Star Certified Green Restaurant in the National Parks

In August 2011, the Mammoth Hotel Dining Room became certified by the Green Restaurant Association. The GRA is a national non-profit organization that provides a cost-effective way for restaurants to demonstrate their commitment to environmental sustainability. The Mammoth Dining Room is Xanterra’s first certified green restaurant, and with a 4-Star rating (out of a possible 4-Stars), is the FIRST 4-Star certified restaurant in Wyoming and our National Park System, and one of only 25 in the country. To achieve certification, restaurants must address critical areas that include: Energy, Food, Water, Waste, Disposables, Chemicals and Pollution Reduction, and Furnishings and Building Materials. To achieve its 4-Star certification, the Dining Room demonstrated sustainable operations through a major restroom remodel, installation of energy-saving LED lamps and water-saving fixtures, sourcing of local and organic cuisine, recycling and composting restaurant waste, and using environmentally preferable cleaning products.

The Terrace Lounge, inside the dining room, is perfect for a pre-dinner cocktail or a spot for a quick late-night bite and a beer.

Please be advised, dining dates, hours, and menu options may be limited and can change with little to no notice.

Operating Dates

Opens: April 25, 2025 with dinner
Closes: March 2, 2026 after breakfast*
* Mammoth Hotel Dining Room will be open in the fall of 2025 between the summer and winter seasons.

Hours

Friday, April 26 – Wednesday, May 21, 2025
Breakfast 6:30 A.M. – 10:00 A.M.
Lunch 11:30 A.M. – 2:30 P.M.
Dinner 5:00 P.M. – 9:00 P.M.

Thursday, May 22 – Wednesday, October 15, 2025
Breakfast 6:30 A.M. – 10:00 A.M.
Lunch 11:30 A.M. – 2:30 P.M.
Dinner 4:30 P.M. – 9:00 P.M.

Thursday, October 16 – Sunday, December 14, 2025
Breakfast 6:30 A.M. – 10:00 A.M.
Lunch 11:30 A.M. – 2:00 P.M.
Dinner 5:00 P.M. – 8:00 P.M.
Reservations are required for dinner starting Nov. 1, 2025

Monday, December 15 – Sunday, January 4, 2026
Breakfast 6:00 A.M. – 10:00 A.M.
Lunch 11:30 A.M. – 2:00 P.M.
Dinner 5:00 P.M. – 9:00 P.M.
Reservations are required for dinner

Monday, January 5 – Monday, March 2, 2026
Breakfast 6:00 A.M. – 10:00 A.M.
Lunch 11:30 A.M. – 2:00 P.M.
Dinner 5:00 P.M. – 8:00 P.M.
Reservations are required for dinner

Reservations

Summer: April 26 to October 31, 2025 – First-come, first-served. No dinner reservations accepted.
Winter: November 1, 2025 to March 2, 2026 – Dinner reservations are mandatory during the winter season and are exclusively available for overnight guests staying at the Mammoth Hot Springs Hotel. Guests with hotel reservations will receive an email 60 days before their arrival with detailed instructions on how to book dinner reservations online. For non-lodging visitors, same-day availability can be checked directly at the host stand.