Sedan, MontanaSedan is a census-designated place in Gallatin County, Montana, United States. The population was 99 at the 2010 census. It is located on Montana Highway 86, 27 miles from Bozeman. The Zip Code is 59086.ClimateThis climatic region is typified by large seasonal temperature differences, with warm to hot summers and cold winters. According to the Köppen Climate Classification system, Sedan has a humid continental climate, abbreviated "Dfb" on climate maps.EducationIt is in Shields Valley Elementary School District and the Bozeman High School District. The high school district is a part of Bozeman Public Schools.