The California Citrus State Historic Park is a dog-friendly park in Riverside, CA. Spanning over 400-acres of southern California, this park is a throwback to those that existed in the early 1900s, a time where citrus fruits were being touted as the second gold rush of the state. The California Citrus State Historic Park has lots of demonstration groves and picnic areas among the trees. Dogs aren't allowed in the buildings at the park, but they are welcome to walk leashed on several trails around the groves. Hours vary by season so be sure to check their website before visiting.