Rulison, ColoradoRulison is an unincorporated community in Garfield [County, Colorado|Garfield County], Colorado, United States. Rulison is accessible from Interstate [70 in Colorado|Interstate 70] and U.S. [Route 6 in Colorado|U.S. Route 6].HistoryRulison is most notable for being the namesake of the Project Rulison nuclear test on September 10, 1969. Rulison never had a post office, and is served by both the Rifle and Parachute post offices.