PA 258 runs through less dense areas of housing before crossing into Slippery Rock Township and becoming Mercer Road.

The road continues into agricultural areas with some woods and homes, crossing Wolf Creek and passing near Christleys Mills.

A short distance past the interchange, PA 258 splits from PA 208 north of the Grove City Premium Outlets by turning north onto two-lane undivided Butler Pike, turning east past more commercial establishments.

The road turns north into wooded areas and runs a short distance to the west of I-79 before curving northwest.

The road runs through more farmland and woodland with a few homes, passing north of State Correctional Institution – Mercer and crossing the Neshannock Creek into East Lackawannock Township.

[1][3] The route heads into residential areas and turns north onto South Pitt Street, entering the borough of Mercer.