On April 25, 1967, Colorado was the first state to enact a modern abortion law. During the first 12 months' experience under the new law 407 therapeutic abortions were performed. Two hundred and ninety-one were performed for psychiatric reasons. These were followed in frequency by fetal indications, 47 patients; rape, 46 patients; and the physical health of the mother, 23 patients. The medical, social, and legal aspects of the problem and the methods that Colorado physicians have used for solving the problems are discussed. © 1969.