Fort Jackson was a fur trading post near the present-day town of Ione in Weld County, Colorado[1] that operated from 1837 to 1838.

[1] It was built in the early part of 1837 near Platteville, Colorado[3] at a cost of $12,000 by Peter A. Sarpy and Henry Fraeb and partially financed by the Western Division of the American Fur Company.

[4] This fort was very aggressive and attempted to capture trade in the Rocky Mountains.

They wintered in lodges nearby and would trade buffalo furs gathered during their summer hunting season.

They also took in buffalo robes worth $9,715.87 ($249,125 today), but their business interest was transferred in October 1838 to Bent, St. Vrain & Company, which operated Fort Saint Vrain.