Wyo. Stat. § 6-3-303

(a) A person is guilty of criminal trespass if he enters
or remains on or in the land or premises of another person,
knowing he is not authorized to do so, or after being notified
to depart or to not trespass. For purposes of this section,
notice is given by:

          (i) Personal communication to the person by the owner
or occupant, or his agent, or by a peace officer; or

          (ii) Posting of signs reasonably likely to come to
the attention of intruders.
     (b) Criminal trespass is a misdemeanor punishable by
imprisonment for not more than six (6) months, a fine of not
more than seven hundred fifty dollars ($750.00), or both.

     (c)   This section does not supersede W.S. 1-21-1003.