California Penal Code § 602, subdivision (h)

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[E]very person who willfully commits a trespass by any of the following acts is guilty of a misdemeanor:

1. Entering upon lands or buildings owned by any other person without the license of the owner or legal occupant, where signs forbidding trespass are displayed, and whereon cattle, goats, pigs, sheep, fowl, or any other animal is being raised, bred, fed, or held for the purpose of food for human consumption; or injuring, gathering, or carrying away any animal being housed on any of those lands, without the license of the owner or legal occupant; or damaging, destroying, or removing, or causing to be removed, damaged, or destroyed, any stakes, marks, fences, or signs intended to designate the boundaries and limits of any of those lands.
2. In order for there to be a violation of this subdivision, the trespass signs under paragraph (1) must be displayed at intervals not less than three per mile along all exterior boundaries and at all roads and trails entering the land.
3. This subdivision shall not be construed to preclude prosecution or punishment under any other provision of law, including, but not limited to, grand theft or any provision that provides for a greater penalty or longer term of imprisonment.