Frozen Run is a tributary of Hemlock Creek in Columbia County, Pennsylvania, in the United States. It is approximately 3.2 miles (5.1 km) long and flows through Hemlock Township. The watershed of the stream has an area of 3.55 square miles (9.2 km2). The stream flows through Frosty Valley and is also near a fault. It is designated as a coldwater fishery. Parts of the watershed are impaired due to siltation. The stream has several unnamed tributaries.A.