Header Notice

Winter is here! Check out the winter wonderlands at these 5 amazing winter destinations in Montana

8 Must-Visit Historic Sites In Ontario, California

Published:

Modified: 5 October 2026

by Ammamaria Moynihan

8 Must-Visit Historic Sites In Ontario, California

The Graber Olive House (1894) is Ontario's oldest continuously operating business, and the Ontario Museum of History & Art chronicles the region from the Serrano people through early pioneers. These two sites anchor a tour of eight historic locations that also includes the Guasti Homestead, the Graber House (1860s), the Ontario Post Office (early 1930s Art Deco), the Graber Olive House Historic District, the Ontario Motor Speedway (opened 1970, closed late 1980s), and the Graber Olive House Gift Shop.

The Graber Olive House

Established in 1894, the Graber Olive House is Ontario's oldest continuously operating business. Visitors can explore the preserved facilities and see traditional methods of olive curing and processing. The Graber Olive House offers guided tours of techniques passed down through generations. The aroma of olives defines the experience.

Ontario Museum of History & Art

The Ontario Museum of History & Art showcases exhibits that chronicle the region's evolution. It features artifacts, photographs, and interactive displays. From the indigenous Serrano people to the early pioneers and the development of the city, the museum offers a comprehensive exploration of Ontario's history. With educational programs and exhibitions, the Ontario Museum of History & Art serves as a resource for those seeking the narrative of Ontario's past.

Guasti Homestead

The Guasti Homestead dates back to the late 19th century and reflects the area's agricultural legacy. Visitors can wander through the preserved homestead and gain insight into the daily lives of the Guasti family. The site's tranquil surroundings and preserved structures allow visitors to immerse themselves in the history of Ontario.

Ontario's Oldest Remaining Structure

Ontario's oldest remaining structure, the Graber House, dates back to the 1860s. This historic dwelling offers a glimpse into Ontario's early architectural heritage. The Graber House invites visitors to step back in time and envision the era when Ontario was taking its formative steps. With its historical significance and architectural allure, the Graber House stands as a landmark among Ontario's historic sites.

The Ontario Post Office

The Ontario Post Office dates back to the early 1930s and features Art Deco design elements. The structure's elegance and historical significance make it a destination for architecture enthusiasts and history buffs. As one of Ontario's historic sites, the Ontario Post Office offers a journey through the city's architectural evolution and cultural heritage.

The Graber Olive House Historic District

The Graber Olive House Historic District encompasses the Graber Olive House and surrounding structures. This historic district offers a glimpse into the region's olive industry and the spirit of its early pioneers. With preserved buildings and a serene ambiance, the Graber Olive House Historic District provides an experience that transports guests to a bygone era.

The Ontario Motor Speedway

The Ontario Motor Speedway, a racing venue that once operated in Ontario, California, holds a place in the city's history. From its inaugural race in 1970 to hosting motorsport events, the Ontario Motor Speedway left a mark on the community. The speedway ceased operations in the late 1980s. The Ontario Motor Speedway remains a destination for motorsport enthusiasts and history aficionados, offering a nostalgic journey through the city's past.

The Graber Olive House Gift Shop

The Graber Olive House Gift Shop offers visitors the opportunity to take home a piece of Ontario's heritage. From gourmet olive products to souvenirs, the gift shop provides offerings that celebrate the region's agricultural legacy. Guests can peruse handcrafted goods and culinary delights, immersing themselves in the flavors and traditions that define Ontario's history. The Graber Olive House Gift Shop serves as a conclusion to a journey through Ontario's history, allowing visitors to carry a piece of the experience with them.

FAQs

Q: Are these historic sites suitable for family visits?
A: Yes, these historic sites are family-friendly, offering engaging experiences for visitors of all ages. Many locations provide educational programs and interactive exhibits that cater to children and adults alike.

Q: Can I take guided tours of these historic sites?
A: Absolutely! Guided tours are available at several of these historic sites, providing in-depth insights into the historical significance and captivating stories behind each location. It's a fantastic way to enhance your visit and gain a deeper understanding of Ontario's rich heritage.