Climax is an extinct mining company town, railroad station, and post office located in Lake County, Colorado, United States. The town site is located at an elevation of 11,342 feet (3,457 m) at Fremont Pass on the Continental Divide of the Americas. The Climax station on the Denver, South Park and Pacific Railroad was the highest railroad station in North America from its construction in 1884 until 1904 and again from 1928 until it was removed in 1937. Although the town was razed in 1962 to make room for the expansion of the Climax Molybdenum Mine, the Climax post office continued operation from December 5, 1917 until January 4, 1974. Climax had the highest elevation post office in the United States from April 1, 1919 to January 1, 1974.

Lake County is a county located in the U.S. state of Colorado. As of the 2020 census, the population was 7,436. The county seat and the only municipality in the county is Leadville. The highest natural point in Colorado and the entire Rocky Mountains is the summit of Mount Elbert in Lake County at 14,440 feet elevation.