PR 27 was originally SH 162 and briefly Spur 91 before gaining its current designation in 1940.

PR 27 begins within Fannin Battleground State Historic Site, forming a loop around the park.

At this point, PR 27 turns north on a two-lane undivided road, heading through open fields.

PR 27 reaches their northern terminus at an interchange with US 59, where the road continues north as FM 2987.

Geographic data related to Texas State Park Road 27 at OpenStreetMap