The Bumann Ranch, the last surviving homestead ranch in Encinitas' backcountry, opens to the public Saturday, Sept. 26.

The Encinitas Preservation Association is hosting its annual historic bus tour that day, and the ranch is the centerpiece. Homesteaded in 1886, the property has been home to three generations of the Bumann family for more than 125 years, according to the association. Its historic buildings and contents have been largely unchanged.

Of the many homestead ranches that once lined Encinitas' backcountry, the Bumann Ranch is the only one still standing.

The ranch sits on 10 acres of what was once a 160-acre spread. It is tied to the settlement of the Encinitas area by German immigrants through the Olivenhain Colony, according to Save Our Heritage Organisation. The family tilled the land with horse-drawn farm equipment until 1965.

The three-hour tour runs from 10 a.m. to 1 p.m. and covers more than 60 historic points of interest. Stops include Olivenhain Town Hall and the San Dieguito Heritage Museum, plus a drive through the former Ecke Poinsettia Farm. The tour departs from Pacific View Arts Center at 380 F St. Parking is available on site.

After the tour, the 1883 School House will be open for viewing. The one-room schoolhouse is the oldest building in the city, according to the San Diego Museum Council.

Tickets cost $60 each and are available through Eventbrite. Proceeds support preservation of the SS Moonlight and SS Encinitas, two historic boathouses at 726 and 732 Third St. that the association acquired in 2008.

Residents can search "Encinitas Preservation Association" on Eventbrite to purchase tickets.