The park land was originally acquired by San Diego County in 1963 to preserve the natural valley environment.
The eucalyptus groves within the park were planted during the early 20th century, a period when the trees were widely promoted for timber in Southern California.
Activity Hill features a series of terraced concrete slides that are a legacy feature of the park's design.
The park sits directly within a major regional wildlife corridor connecting the inland mountains to the Pacific Ocean.
Certain sections of the park are built on the remnants of a historic river terrace, influencing the current drainage patterns.
The park serves as a trailhead for segments of the Coast to Crest Trail, which is intended to span 71 miles upon completion.
San Dieguito County Park is a 125-acre regional park situated along the San Dieguito River valley, featuring extensive riparian habitats. The park is characterized by its varied topography, ranging from flat picnic meadows to steep, wooded hillside trails. It offers five distinct playgrounds, including the notable Activity Hill area equipped with long slides. Athletic facilities include multiple basketball courts and baseball fields. The site is part of the larger San Dieguito River Park Joint Powers Authority regional trail system. Dense stands of mature eucalyptus trees provide significant shade cover throughout the picnic zones. The park maintains several miles of trails suitable for hiking and equestrian use. It is a designated stop for regional wildlife, particularly migratory birds along the valley corridor.
The top of Activity Hill, which offers an elevated vantage point looking out over the eucalyptus canopy and the river valley.
Bring binoculars if you enjoy birdwatching, as the eucalyptus groves attract various raptors and local avian species.
The terrain between the lower picnic areas and the upper ridges is steep; prioritize comfortable walking shoes if you plan to explore the trails.
Check the county's park website before visiting to see if specific picnic areas have been reserved for private events.
Do not attempt to hike the steepest trail sections during the mid-day heat of summer, as shade is inconsistent on the ridges.
Leashed pets are welcome; please pack out all trash and respect the quiet zones near residential boundaries.
