Wyo. Stat. § 11-28-102

Current with changes from the 2024 Legislative Session, Acts 1-58, 60-118
Section 11-28-102 - Lawful fences generally
(a) The following are lawful fences in this state:
(i) A fence made of steel, concrete or sound wooden posts and three (3) spans of barbed wire not more than fifteen (15) inches or less than ten (10) inches apart, or two (2) spans of barbed wire with a wooden rail on top. Wooden posts shall be at least four (4) inches in diameter. Posts shall be set firmly in the ground at least twenty (20) inches deep, at no greater distance apart than twenty-two (22) feet between the posts or thirty-three (33) feet with at least two (2) iron or wooden stays between the posts. Stays shall be placed equal distance apart from themselves and the post on either side;
(ii) A post and board fence made of sound posts not less than four (4) inches in diameter set substantially in the ground not more than ten (10) feet apart, with three (3) boards sold as one (1) inch lumber eight (8) inches wide, and not more than ten (10) inches apart, or four (4) boards sold as one (1) inch lumber six (6) inches wide, not more than eight (8) inches apart, securely fastened with nails or otherwise;
(iii) A four (4) pole fence with round poles not less than two (2) inches in diameter at the small end, with either upright or leaning posts not more than sixteen (16) feet apart, and securely fastened with nails, wires or otherwise.
(b) All other fences made and constructed of boards, rails, poles, stones, hedge plants or other material which upon evidence is declared to be as strong and well calculated to protect enclosures, and is as effective for resisting breaching stock as those described in subsection (a) of this section, shall be considered a lawful fence.
(c) Any fence enclosing any hay corral situated outside of any field or pasture enclosed by a lawful fence, shall be at least six (6) feet high, constructed of boards, poles or wire. The posts shall not be more than eight (8) feet apart and set twenty-four (24) inches in the ground. If the fence is constructed of barbed wire there shall be at least seven (7) spans of wire, and all wires shall be kept properly stretched. Any fence better than the above described fence is a lawful fence.

W.S. 11-28-102