It depends.  Under California law, your generally are not liable for any injury to a trespasser on your property. Suppose, however, that you know certain people continually trespass on your property, perhaps using it as a shortcut; then a court might find that you should have notified these regular trespassers about any hidden artificial conditions of which you were aware that could seriously injure them.  It is all about whether or not you had prior knowledge of the trespassing going on - if not, then you generally risk no legal responsibility.
 

More Legal Questions About Slip and Fall Accidents?

Do you have more legal questions about slip and fall or premise liability accident cases?  Return to the Slip and Fall Accidents in California Frequently Asked Legal Questions page.