The Trapper's Trail is a north-south path along the eastern base of the Rocky Mountains that links the Great Platte River Road at Fort Laramie and the Santa Fe Trail at Bent's Old Fort. Along this path there were a number of trading posts, also called trading forts. It was an important trade route for animal trappers and fur traders in the North American fur trade from about 1820-1846.
In 1846 it was used by a group of Mormon immigrants who established a branch of the Church of Jesus Christ of Latter-day Saints near the southern end of the trail. The sick detachments of the Mormon Battalion used this trail to return to the Mormon pioneers on the Mormon Trail.