Ontario in San Bernardino County, California — The American West (Pacific Coastal)

Graber Olive House

Olive Mill

Photographed by Craig Baker, October 6, 2018

1. Olive Mill Marker

Inscription.
This mill was used in the early days of California. Olives were placed in the large vessel and crushed by the solid granite wheels, weighing about 12,000 lbs. The crushed olives were pushed into burlap sacks that were placed over the gate. The oily juice was pressed from the sacks leaving pulp and seeds. The olive oil was separated and further refined.

Erected by Graber Olive House.

Topics. This historical marker is listed in these topic lists: Agriculture • Industry & Commerce.

Location. 34° 4.697′ N, 117° 38.878′ W. Marker is in Ontario, California, in San Bernardino County. It is on 4th Street ¼ mile east of Euclid Avenue, on the left when traveling east. Touch for map. Marker is at or near this postal address: 315 E 4th Street, Ontario CA 91764, United States of America. Touch for directions.

Regionally, this marker is in Greater Los Angeles,

in the Inland Empire,

in the Peninsular Ranges,

and specifically in the Transverse Ranges.

It is also in the American Southwest.

Globally, it is in North America,

on the Ring of Fire,

in the Pacific Rim,

Paid Advertisement

Click or scan to see
this page online

in the Western Hemisphere,

in the Western World,

and in the Anglosphere.

Historically, it finds itself in what was once New Spain

and also Mexico’s Alta California.

Other nearby markers. At least 8 other markers are within walking distance of this marker: Hitching Post (a few steps from this marker); College Park Historic District (approx. 0.2 miles away); Rosewood Court Historic District (approx. 0.2 miles away); Oakley House (approx. ¼ mile away); El Morado Court Historic District (approx. 0.4 miles away); Armsley Square Historic District (approx. 0.4 miles away); Central School (approx. half a mile away); James A. Finley House (approx. 0.6 miles away). Touch for a list and map of all markers in Ontario.

Regarding Graber Olive House. In 2020 the Graber Olive House property was declared Historic District No. 8 by the City of Ontario, California. The district contains 26 historical elements, including the founder’s house, vat room, canning room, original barns, olive sheds, labeling rooms, several concrete warehouses and the La Casita Gift Shop. Also on the list are several trees, including a 100-year-old oak tree, several

Olive Mill and Marker image. Click for full size.

Photographed by Craig Baker, October 6, 2018

2. Olive Mill and Marker

front-yard olive trees, a few coastal redwoods and a large camphor tree, one of the earliest of the variety ever planted in the city.
The company moved its olive crop location to the San Joaquin Valley many years ago.

Graber Olive House closed during the COVID-19 Pandemic. Fundraising and efforts to reopen are underway (2025-2026).

Also see . . . Graber Olive House. See the latest updates, links, apparel, and merchandise. (Submitted on October 29, 2025.)

Graber Olive House & Olive Mill image. Click for full size.

Photographed by Craig Baker, October 6, 2018

3. Graber Olive House & Olive Mill

Nearby Marker image. Click for full size.

Photographed by Craig Baker, October 6, 2018

4. Nearby Marker

Graber Olive Processing image. Click for full size.

courtesy Graber Olive House

5. Graber Olive Processing

Olive grading machine, built in 1934.

Credits. This page was last revised on May 5, 2026. It was originally submitted on November 2, 2018, by Craig Baker of Sylmar, California. This page has been viewed 1,114 times since then and 57 times this year. Last updated on December 13, 2018, by Craig Baker of Sylmar, California. Photos: 1. submitted on November 2, 2018, by Craig Baker of Sylmar, California. 2, 3, 4. submitted on November 3, 2018, by Craig Baker of Sylmar, California. 5. submitted on July 25, 2024, by Craig Baker of Sylmar, California. • Andrew Ruppenstein was the editor who published this page.