This multi-use, whole-access trail between Concord and Pleasanton follows the old Southern Pacific Railroad right-of-way that was established back in 1891 and abandoned in 1978. The Iron Horse Regional Trail, part of the dog-friendly East Bay Regional Park District, stretches a full 32 miles when complete. The latest segment opened to the public on August 19th, 2014, finally closing a 1.8-mile gap that had existed since the Pleasanton/Dublin BART station down to Santa Rita Road in Pleasanton. That final piece took almost 30 years of planning and funding to pull together, representing real interagency cooperation and community effort.

What makes this trail valuable for dog owners is how it connects so many different areas. You’ll find residential neighborhoods, commercial zones, business parks, schools, and open space all accessible from different entry points. The trail also links directly to BART and County Connection transit, so if you’re coming from further away, you can make it work. The flat, paved surface makes it easy to walk at a steady pace, and the route feels less isolating than some trails since you’re moving through established communities rather than just wilderness.

The trail’s popularity means you’ll often see other people out here with their dogs, so it’s good for socializing without being overwhelming. The tree coverage varies along the route—some sections offer decent shade, especially as you move toward the Pleasanton end, while other stretches are more open. In summer, an early morning or late afternoon walk beats the heat considerably.

Keep your dog on a leash throughout your visit. If you’re starting from Concord, there are parking areas and access points near residential streets that make it convenient to hop on without needing a formal trailhead.