Black Diamond Mines Regional Preserve spreads across nearly 5,375 acres in Antioch, offering some of the East Bay’s most varied hiking terrain for dogs and their people. The park sits within the East Bay Regional Park District system, which has built a solid reputation for welcoming dogs on trails. You’ll find everything from gentle 2-mile walks to strenuous 7-mile routes, so there’s something whether your dog is still building stamina or ready for serious mileage.

The landscape shifts as you hike—rolling hills give way to rugged terrain, and you’ll spot remnants of the area’s old mining operations scattered throughout. The variety keeps both you and your dog engaged. Dogs must be leashed in designated areas and under voice control elsewhere, which is important to know before you arrive. The park also has grazing cattle, so a firm grip on the leash matters if your dog tends to chase or gets nervous around larger animals.

Before heading out, download the trail maps and mileage charts from the park’s website. They’re genuinely helpful for planning which loop works for your day. The terrain ranges from moderate to strenuous, so knowing distances ahead of time saves frustration. Spring and summer bring foxtails, which can get stuck in paws and cause problems, so inspect your dog carefully after hiking during those months.

One significant limitation: there’s no water available in the park itself. Bring plenty for both of you, plus snacks. This matters more on longer hikes when you’re out for several hours. The park is visitable year-round, though summer heat can be intense on the exposed trails. Early morning hikes work well if you’re going in warmer months.

The combination of distance options, interesting terrain, and genuine remoteness makes this preserve worth the drive from other parts of the Bay Area. Just come prepared with water and realistic expectations about the heat and foxtails depending on when you visit.