San Dieguito River Park, Natural greenway in San Diego County, United States.

San Dieguito River Park is a greenway that stretches across different landscape types, connecting coastal areas with mountain regions. The grounds feature wide river valleys, wooded sections, and open hillsides threaded by an extensive network of paths.

The protected area was created in 1989 when multiple communities joined together to preserve the valley. Since then it has grown into a network of connected park sections and trails.

The park is governed by a joint powers authority formed by San Diego County and the cities of Del Mar, Escondido, Poway, San Diego and Solana Beach, a structure created when the greenway was established in 1989. The Coast to Crest Trail, planned to run 70 miles, is the spine of the park: 45 miles were built by 2017, alongside 20 miles of auxiliary trails.

The park is accessible year-round without entry fees, making it a free destination. The trails suit various activities, so visitors should choose sections based on their abilities and interests.

The park is a joint powers authority of San Diego County and the cities of Del Mar, Escondido, Poway, San Diego and Solana Beach. Its Coast to Crest Trail is planned to run 70 miles; by 2017, 45 miles of it and 20 miles of auxiliary trails were built.