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Blue Rocks Boulder Field

This unusual rock formation in Berks County is nearly a mile long and may date from the Ice Age.

Lenhartsville, Pennsylvania

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The rocks descended from the quartzite cliffs of Blue Mountain.   Courtesy of Experience Reading and Berks County 
Step onto the rocks to view the massive expanse of rocks.   Courtesy of Experience Reading and Berks County
Sure-footed explorers can see what’s on the other side of the field.   Courtesy of Experience Reading and Berks County
A view of the field on a foggy day.   Courtesy of Experience Reading and Berks County
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Just outside of Lenhartsville, not far from Hawk Mountain Sanctuary, a cascading ribbon of grayish-blue rock flows for nearly a mile between the trees. Tuscarora quartzite is uncommon in Berks County, so geologists are still unsure as to how or why this boulder field exists here. Some experts estimate that it probably formed sometime in the last Ice Age.  

The field consists of thousands of rocks, from 4 inches to 20 feet long that descended from the quartzite cliffs of Blue Mountain. Today, the area is managed by the Blue Rock Family Campground, which offers bus tours, day passes for hiking and exploring the rocks, and more. 

Pick up a trail map from the campground and choose one of several routes to nearby Pulpit Rock or The Pinnacle, the highest lookout point on the Appalachian Trail. 

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Know Before You Go

Tent and RV camping, and cabin and cottage rentals are all available. Day hiking passes cost $6-8 and can be purchased at Blue Rock Family Campground. For more details, visit bluerockscampground.com. 

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Published

November 25, 2025

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