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Pituophis catenifer catenifer
Saw this snake on the trail on the hill above Brickyard Cove in Point Richmond.
Hiking trail in Point Richmond, CA
Not out of the realm of possibility. People buy "exotic" pets at pet stores and they either escape, or become too much to handle and are "released in to the wild" to fend for themselves...
every snake I saw in my book that looks like that marking, isn't supposed to be in your area...unless some person turned it loose there...