Hill began mountaineering as a teenager; her first summit at age 13 was Disappointment Peak in the Teton Range. In 1992 she began a quest to become the first American woman to scale the Seven Summits, the highest peaks on each continent. She summitted Aconcagua (1992), Denali (1992), Vinson Massif (1993), Mount Elbrus (1993), Mount Kilimanjaro (1993), Mount Kosciuszko (1994), and Puncak Jaya (1995). Hill finally reached the Mount Everest summit in 1996, thus becoming the second American woman to scale the Seven Summits, following Mary Dolly Lefever.