Castle Rock, also known as "Frenchies" is a ghost town in Summit County, Utah, United States.

The area was first used as a campsite in 1847 by Brigham Young and his followers emigrating during the Mormon Trail from Nauvoo, Illinois.

[1] Castle Rock was founded in 1860 when Head of Echo Canyon, also known as "Frenchies", a Pony Express station was built[2] in what is now Summit County.

The town of Castle Rock grew around the station as families settled there, hoping to trade with travelers [3] and in 1872, a school was built and functioned until 1937.

[4] The original log structure of the station closed in 1867 and was purchased by a French trapper, who moved it a mile away from its current site.