Saint Mary's Glacier (or St. Marys) is a semi-permanent snowfield located in Arapaho National Forest in the U.S. state of Colorado.[2] Saint Mary's Glacier is 2.5 mi (4.0 km) southeast of James Peak, and about an hour drive northwest from Denver[3] The nearest community is the unincorporated Alice, Colorado and is accessible via a 1.6 mile out and back hike from a parking lot in Alice.[4]The area is very popular for fishing, and hiking.