The Whitney Glacier is a glacier situated on Mount Shasta, in the U.S. state of California. The Whitney Glacier is the longest glacier and the only valley glacier in California. In area and volume, it ranks second in the state behind the nearby Hotlum Glacier. In 1986, the glacier was measured to be deep and over three km in length. The glacier starts on Mount Shasta's Misery Hill at and flows northwestward down to the saddle between Mount Shasta and Shastina, where uneven ground causes a major icefall at . It then flows down the valley between the two peaks, reaching its terminus at .