The Medical Department of the University  of Colorado  was open to women in its founding year of 1883, but it was not until 1887 that Eleanor Lawney graduated from the Medical Department of the University  of Denver  (established in 1881) and became the first woman to graduate from a Colorado   medical school.
Oregon, California and Colorado were the only Western states with medical schools from the 1870s through Esther Clayson’s years at the University of Oregon Medical Department in the 1890s. 
For Sawtelle see
“Mary Priscilla Avery Sawtelle, 1835-94” in Pacific  Northwest  Women, 1815-1925: Lives, Memories, Writings ed. Jean M. Ward and Elaine A. Maveety (Corvallis: Oregon State University Press, 1995), 200-08.
For California   see 
Emma L. Merritt, “Address Delivered by Dr. Emma L. Merritt at a Banquet Given by Women Physicians, October 11, 1924, in Honor of the Eighty-Third Birthday of Dr. Lucy Maria Field Wanzer,” California and Western Medicine 23, no. 5 (May 1925): 599-601; Esther Pohl Lovejoy, Women Doctors of the World (New York: Macmillan, 1957), 103; John Long Wilson, “Stanford University School of Medicine and the Predecessor Schools: An Historical Perspective,” Digital Edition, Lane Medical Library, Stanford School of Medicine, http://elane.stanford.edu/wilson/index.html; Adelaide Brown, “The History of the Development of Women in Medicine in California,” California and Western Medicine 23, no. 5 (May 1925): 579-82.
For Colorado   see
Mary DeMund, Women Physicians of Colorado   (Denver: Range Press, 1976), 46.