Green-Ash Trail is a hiking and biking trail in Frederick County, Maryland. It is within Gambrill State Park. It is 1.3 miles long and begins at 1,573 feet altitude. Traveling the entire trail is 1.1 miles with a total elevation gain of 336 feet. The Gambrill Mountain Bike Parking Lot parking and the Gambril Lower Lot bicycle parking are near the trailhead. The South Frederick Viewpoint and North Frederick Viewpoint and the tea room parking lot shelter can be seen along the trail. There are also parkings along the trail.
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