Vacant Lot or Land for sale by owner in Old Snowmass, CO 81654. FOR SALE - 37.5 Acres in Old Snowmass, Colorado (Aspen-Pitkin County) 15 minutes to the Aspen airport. Unsurpassed 360 degree views of Snowmass Ski Area, continental divide. Mt Sopris, and sweeping views of western valley. Private, 1041 in place, electric to already establish ... more.