The Fort Collins Agricultural Colony was a 19th-century enterprise in Larimer County, Colorado to promote new agricultural and commercial settlement in and around the town of Fort Collins. Founded in the autumn of 1872 as an outgrowth of the Union Colony in nearby Greeley, the colony was instrumental in the early growth of Fort Collins, as well as in making it an agricultural center in the Colorado Territory at a time when the region was still known primarily for its mineral resources.