History of Alameda County Fairgrounds in Timeline

By Popular Timelines Editorial Team · Updated: June 19, 2025

The Alameda County Fairgrounds, a 270-acre facility in Pleasanton, California, is known for hosting the annual Alameda County Fair since 1912. It also holds various trade shows and community events. The Fairgrounds is notable for the Pleasanton Fairgrounds Racetrack, established in 1858, making it the oldest one-mile horse racing track in the U.S. The site also includes a 3,000-seat amphitheater and a 9-hole golf course situated within the racetrack's infield.

1905: Heathcote-MacKenzie House built

Around 1905, the Heathcote-MacKenzie House, also known as The Heritage House, was built on the site of the Alameda County fairgrounds to host wealthy harness racers.

1912: Annual Alameda County Fair held

In 1912, the annual Alameda County Fair was first held at the Alameda County Fairgrounds, marking the beginning of a long-standing tradition.

1917: Fair not held

In 1917, the Alameda County Fair was not held.

1918: Fair not held

In 1918, the Alameda County Fair was not held.

1942: Fair not held

In 1942, the Alameda County Fair was not held.

1944: Fair not held

In 1944, the Alameda County Fair was not held.

1959: Model train exhibit established

In 1959, the Alameda County Central Railroad Society established a model train exhibit at the fairgrounds, which later expanded to include two layouts in O scale and HO scale.