On April 22, Greystone Hotels honored its commitment to the environment by participating in the 47th annual celebration of Earth Day. All 11 properties donated a portion of proceeds from Earth Day gross rooms revenue to the Nature Conservancy. In addition, all Greystone employees participated in Greystone's annual "Day of Service" for local community partners. These partners include: Pine Nursery Park Cleanup (Bend, Ore.), Clean Pan Pacific Park (Los Angeles), Palo Alto Earth Day Festival (Palo Alto), 15th Annual Creek to Bay Cleanup (San Diego), American Heart Association Teaching Gardens (San Diego), San Diego Rescue Mission (San Diego), Los Gatos Chamber of Commerce Spring into Green (Los Gatos), Sue Bierman Park Cleanup (San Francisco), and Glide's "Feed the Hungry" Initiative (San Francisco).
Greystone Hotels is a long-time supporter of environmental conservancy. In addition to donating annually to the Nature Conservancy, the company celebrates Earth Hour with a yearly donation to the National Arbor Day foundation. All 11 Greystone hotels are also partners of the Clean the World organization, which recycles unused hospitality industry hygiene products to combat disease and illness both domestically and internationally. Greystone's hotels are continually recognized as TripAdvisor Green Leaders, and a number of properties are part of the California Green Lodging Program.