This hike is on unofficial trails or no trail at all in Ignacio Valley Open Space Preserve. Thunderbird Ridge is a subridge that starts at Thunderbird Court off of Fairway Drive in Novato, and rises up to Big Rock Ridge fire road at about 1400 feet. This hike starts out hugging the side of the ridge until we climb up to its spine and meet the unofficial Thunderbird Ridge Trail. We then hike a ways up the ridge until we meet a faint trail that goes off to the left and plunges down to meet a small creek bed which we take down to meet Thunderbird Creek. We hike along the creek until reach the end of Thunderbird Drive which we then take back to the car.