Unkown Horse Ridge is a hiking and biking trail in Deschutes County, Oregon. It is within Western Juniper Instant Study Area. It is 5.8 miles long and begins at 3,665 feet altitude. Traveling the entire trail is 4.9 miles with a total elevation gain of 611 feet. The Horse Ridge Trailhead picnic site and the Horse Ridge Trailhead parking are near the trailhead.