Lake Mary Loop trailhead is an easy 0. 6-mile boardwalk trail at Rocky Mountain Arsenal National Wildlife Refuge in Adams County, Colorado, featuring long boardwalks and piers extending over the water—ideal for family hikes and wildlife viewing.

The trailhead offers parking at the Lake Mary Learning Center or at a small lot at the base of the lake, with year-round access from sunrise to sunset (extended to 8 pm May 1-August 1).

This is a hiking-only trail suitable for all fitness levels, with opportunities to observe waterfowl, songbirds, deer, raccoons, muskrats, and aquatic insects like dragonflies.