O to A is a hiking and biking trail in Castle Rock, Colorado. It is within Ridgeline Open Space. It is 0.4 miles long and begins at 6,514 feet altitude. Traveling the entire trail is 0.8 miles with a total elevation gain of 250 feet. The Map information and the Ridgeline Trailhead Parking (Coachline Road) parking are near the trailhead. There are also restrooms.
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