SH 209's southern terminus is at U.S. Route 50 (US 50) south of Boone, and the northern terminus is at SH 96 in Boone.

SH 209 runs 1.5 miles (2.4 km), beginning heading perpendicular away from US 50 south of Boone.

South Higgins Avenue, what the highway is named at this point, turns slightly from northeast to north as it heads through a farmland terrain.

The route crosses the Arkansas River as well as another one of its tributaries before entering Boone.

Media related to Colorado State Highway 209 at Wikimedia Commons