The Museum was opened in 1965 as a direct result of the interest spurred by Porterville's Centennial Committee. Through diligent efforts of residents, Southern Pacific Railroad gave the city permission to operate a museum on the site of the now 1913 passenger station, and has been open to the public ever since.

The Museum has displays that feature local wildlife, furnishings of past residents who helped to found Porterville, household goods, firearms, flora and interesting artifacts that help to understand the history of the community. The Museum also has a large display of Native American artifacts that depict the life and history of the local Tule River Yokuts.

PGS has had many experiences at the museum that include sounds, evps, shadows and voices. An overnight recording session revealed steps and objects being moved around and doors opening and closing. The Museum was alarmed so no one could go in the building without being detected. 

PGS has had several events at the Museum which are well attended and helps give the public the chance to experience actual paranormal investigation. Proceeds are given right back to the Museum for special projects that are otherwise not budgeted.