Legality of Cannabis by U.S. Jurisdiction Colorado portalUnited States portalHistory portal This category is for topics specifically related to the year 1975 in the U.S. state of Colorado. 19701971197219731974197519761977197819791980 1920s1930s1940s1950s1960s1970s1980s1990s2000s2010s2020s Subcategories This category has the following 3 subcategories, out of 3 total. / 1975 disestablishments in Colorado (4 P) 1975 establishments in Colorado (22 P)S 1975 in sports in Colorado (12 P)