Some municipalities have ordinances restricting the placement of lawn signs. In a state general election year (even years), these ordinances are overruled by Minnesota Statutes 211B.045 from August 1st until 10 days after the general election, and campaign signs may be posted in any size and number. In municipalities which have no sign ordinance, campaign signs may be posted in any size and number throughout the year.
Additional information on the legal placement of signs may be found in the DOT Letter to Candidates.