Placerita Canyon holds a singular distinction in California history: it is where gold was first commercially discovered in the state, six years before the famous 1848 strike at Sutter's Mill that launched the Gold Rush. On March 9, 1842, Francisco López, a local rancher, reportedly fell asleep under a large oak tree in the canyon. When he awoke, he pulled up wild onions from the soil and found gold flakes clinging to the roots. This discovery sparked a modest gold rush to the area and established California's first commercial gold mining operation. The famous tree, known as the Oak of the Golden Dream, still stands within Placerita Canyon State Park and is marked as California Historical Landmark No. 168. The surrounding 350-acre park preserves beautiful oak woodland habitat, seasonal streams, and miles of hiking trails. The Placerita Canyon Nature Center offers exhibits on the region's natural history, geology, and Tataviam culture. The Walker Cabin, a 1920s-era homestead, adds another layer of historical interest. The park is popular with families, school groups, hikers, and nature enthusiasts year-round.