SR 127 heads east 3.55 miles (5.71 km) to U.S. Route 522 (US 522) near Cross Junction in northwestern Frederick County.

SR 127 is the easternmost portion of Bloomery Pike, a turnpike that connected Winchester with the namesake iron smelting center.

The point where SR 127 begins is an arbitrary point on the state line where West Virginia maintenance on the road begins and signs reflecting the state and county are posted.

SR 127 heads east atop the state line until the highway fully enters Virginia at Timber Ridge, where the state line turns south.

The state highway descends from Timber Ridge into the valley of Crockett Run, which the highway follows to its eastern terminus at US 522 (Frederick Pike) northwest of Cross Junction.