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  It is up to the owner of private property to indicate whether the public can use his land in Maine. Although fencing is a legally binding way of indicating trespassers are not welcome, this is expensive. Posting signs on the border of your land is an inexpensive way to deter trespassing.
  
  

Signage

• The easiest way to indicate no trespassing on your property is to put signs up on the border. Maine law says the signs must be no farther than 100 feet apart and posted in a manner that should attract attention of any passers-by.
  
  

Paint Marks

• You can show that you do not allow trespassers on the land without permission in Maine by painting two silver horizontal marks, each 2 inches wide and up to 8 inches long, on objects along the border. These must be 3 to 6 feet above the ground and can be on trees, rocks or other items. Like the signs, the stripes must be no farther than 100 feet apart and placed in a manner to attract attention.
  
  

Regulations

• State law also says the posted signs or paint marks must also be at any vehicle entrances. You only have to post or paint the area that is off limits. However, you have to mark the borders between the public and private areas. You can only post or paint on things that belong to you, and you cannot post or paint on a mailbox or any road signs that may be on your property. In addition, when posting a sign on a tree, you must affix it with staples or aluminum nails that cannot damage a chipper or saw.