San Pablo Bay Trail

Mare Island

East Bay, California

Start Exploring
San Pablo Bay Trail


  • The parking area for the San Pablo Bay Trail.- San Pablo Bay Trail
  • Signage at the entrance to the trail warns against leaving valuables in your car..- San Pablo Bay Trail
  • The San Pablo Bay Trail.- San Pablo Bay Trail
  • The main trail runs beside a fence that isolates an area of hazardous waste.- San Pablo Bay Trail
  • The bay with Marin and the East Bay in the background.- San Pablo Bay Trail
  • The San Pablo Bay Trail.- San Pablo Bay Trail
  • The East Bay hills.- San Pablo Bay Trail
  • Informational signs along the San Pablo Bay Trail.- San Pablo Bay Trail
  • The trail continues southeast, or you can take the loop.- San Pablo Bay Trail
  • - San Pablo Bay Trail
Overview + Weather
Very easy, flat hike. Bird watching. Beautiful bay views.
Surrounds a hazardous waste dump. Theft from cars is an issue.
East Bay, CA
Pets allowed: 
Net Elevation Gain: 
2.00 ft (0.61 m)
Parking Pass: 
Not Required
Preferable Season(s):
Winter, Spring, Summer, Fall
Total Distance: 
2.10 mi (3.38 km)
Trail type: 
Trailhead Elevation: 
8.00 ft (2.44 m)
Current Local Weather:
Hike Description

Hike Description


Mare Island is a 3.5-mile long peninsula alongside Vallejo. The area was first happened upon by Spanish Explorer Perez Ayala in 1775. The island was named after Mariano Guadalupe Vallejo's prized white mare, which was feared to have drowned after the ferry it was being transported on capsized in the Carquinez Strait. The horse swam ashore on the peninsula, and was discovered alive and well a few days later.

Mare Island became a naval shipyard in 1852, and it grew into a base over the course of the following century, employing over 40,000 workers during World War II. The naval base was closed in 1995, which left Vallejo in debt but provided Mare Island with the resources to rehabilitate the salt marshes surrounding the old base.

This 2.1-mile trail is a very easy loop that provides incredible views of the bay and mountains, including Mount Diablo and Mount Tamalpais. There are many varieties of waterfowl as well as a population of the endangered Salt Marsh Harvest Mouse. This trail surrounds a hazardous waste dump; however, that area is fenced off and does not detract from the natural beauty of the area.

You will begin your hike heading west toward the bay. This view can be particularly stunning on an overcast day. Once at the bay, turn south and continue along the wide path. Once you hit the fork you can continue to the end of the trail for another mile or turn left and loop back to your car.

Updates, Tips + Comments

Updates, Tips + Comments

Field Guide

Field Guide

Location + Directions

Location + Directions

Nearby Camping + Lodging

(8 within a 30 mile radius)

Nearby Adventures

(81 within a 30 mile radius)

Adventure Community

Adventure Community

Who Wants To Do It
9 Members
Who's Done It
1 Members
Submission by
62 Adventures Explored
61 Adventures Published

Newsletter Signup

Join the Outdoor Project Community

Get access to essential planning materials and information for your next adventure. Take a few seconds to join the community. It’s FREE!

Free Field Guides + Maps

Post Updates, Tips + Comments

Organize + Track Your Adventures

Insider Detailed Info, News + Benefits

Custom Driving Directions

Recommended Campsites, Photos + Reservation Info