The route is not a designated trail, but it’s done frequently enough that a path is visible for much of the way. Look for a faint trail through the grass to the north of the lake. This goes steeply up the meadowy slopes, finding a natural ramp to bypass the cliffs and enter an upper bowl. From there, find the path of least resistance over the talus to gain the north ridge. It’s a straightforward hike up the tundra, but becomes quite steep near the top.

After completing the upper portion of the north ridge, you’ll be standing on a false summit, staring down a huge couloir with Medano Lake looking tiny at the bottom. From there, continue along a gentler upper ridge to gain the summit.

The top of Mount Herard is broad and grassy. Walk just beyond the summit cairn for the ultimate panorama. From there, looking over the dunes and the San Luis Valley is like the view from an airplane. Also visible to the north are the jagged peaks of the Crestones. When you’ve taken it all in, simply reverse the route to return.

Sources: https://www.nps.gov/grsa/planyourvisit/hiking.htm https://www.summitpost.org/medano-lake-trailhead/165806