Hayward Regional Park spreads across 1,811 acres of East Bay marshland, with trails that wind through salt marsh, freshwater wetlands, and seasonal ponds. It’s a solid spot for a dog walk if you stick to the northern sections and are willing to share the paths with serious birdwatchers who come for the migrating waterfowl.

The star attraction here is Cogswell Marsh, a 250-acre tidal restoration area that feels genuinely wild—you’ll see the landscape changing seasonally as water levels shift. The trails let you get close to the action without disturbing nesting birds, which is why the park enforces restrictions: dogs aren’t allowed south of the West Winton Avenue flood control channel, and staying leashed is required everywhere. It’s worth respecting these boundaries because the marshes are active nesting habitat and the park takes that seriously.

You can hike, bike, or jog through here, depending on trail conditions and your dog’s energy level. The paths aren’t crowded, especially on weekdays. Bring water because shade is limited once you’re out on the flats. There aren’t picnic tables, but you’ll find benches scattered along the trails where you can sit and watch the water for a bit. The lack of facilities means it stays quiet and relatively undeveloped, which appeals to people who want a more natural experience than a manicured park.

Parking is free, which is always nice. The main thing to keep in mind is that conditions can get muddy during wet seasons, and on warm days the trail exposure means your dog might get overheated. Early morning visits work better for that reason. If you’re in Hayward looking for something beyond the neighborhood parks, this is worth the drive—especially if your dog doesn’t mind the marshland smell and you’re genuinely interested in what’s happening ecologically rather than just wanting a photo spot.