A mountain man is an explorer who lives in the wilderness and makes his living from hunting and trapping. Mountain men were most common in the North American Rocky Mountains from about 1810 through to the 1880s. They were instrumental in opening up the various emigrant trails allowing Americans in the east to settle the new territories of the far west by organized wagon trains traveling over roads explored and in many cases, physically improved by the mountain men and the big fur companies, originally to serve the mule train-based inland fur trade.

The Rocky Mountain Rendezvous was an annual rendezvous, held between 1825 and 1840 at various locations, organized by a fur trading company at which trappers and mountain men sold their furs and hides and replenished their supplies. The fur companies assembled teamster-driven mule trains which carried whiskey and supplies to a pre-announced location each spring-summer and set up a trading fair. At the end of the rendezvous, the teamsters packed the furs out, either to Fort Vancouver in the Pacific Northwest for the British companies or to one of the northern Missouri River ports such as St. Joseph, Missouri, for American companies. Early explorer and trader Jacques La Ramee organized a group of independent free trappers to the first ever gathering as early as 1815 at the junction of the North Platte and Laramie Rivers after befriending numerous native American tribes.