when painting the fence orange for posting if its a wooden barb wire fence do you paint the whole wood post and how often ever one or one every 660ft?

The short answer to your question is one hundred (100) square inches of fluorescent orange paint is required for a wood post, at an interval of not less than one per 660 feet. There are two statutes which address this issue, Idaho Code Sections 18-7008 (criminal trespass) and 36-1603 (hunting and fishing trespass). The statutes currently require posting with legible "No Trespassing" signs, or "a minimum of one hundred (100) square inches of fluorescent orange paint except that when metal fence posts are used, the entire post must be painted fluorescent orange, or other notices of like meaning, placed in conspicuous manner on or near all boundaries at intervals of not less than one (1) sign, paint area or notice per six hundred sixty (660) feet ...." There is provision in the statutes for marking only at certain points of access when the geographic configuration of the property limits access. The Legislature amended these statutes this year to allow other shades of orange paint, and to specify that only the top 18 inches of a metal post must be painted. Effective July 1, 2013, the statutes are amended to require posting with legible "No Trespassing" signs, or "a minimum of one hundred (100) square inches of fluorescent orange, bright orange, blaze orange, safety orange or similar high visibility shade of orange colored paint except that when metal fence posts are used, a minimum of eighteen (18) inches of the top of the post must be painted a high visibility shade of orange, or other notices of like meaning, placed in a conspicuous mannner on or near all boundaries at intervals of not less than one (1) sign, paint area or notice per six hunderd sixty (660) feet ..."