I happened upon an interesting article discussing the rights, in terms of free speech, for displaying campaign yard signs by an organization, Foundation for Individual Rights and Expression. The article explores the legal protections afforded to personal yard signs and flags under the First Amendment. It clarifies that while local governments can regulate sign displays, they cannot impose restrictions based on viewpoints or arbitrary restrictions. The article distinguishes between unconstitutional content-based restrictions, which are subject to strict scrutiny as seen in Reed v. Town of Gilbert, and content-neutral “time, place, and manner” restrictions. It explains that content-neutral limits, such as numerical or durational restrictions, are often unconstitutional if they unduly impede free expression and do not leave ample alternative communication channels. Ultimately, the piece underscores the robust First Amendment protection for individual expression on private property.
https://www.thefire.org/research-learn/your-yard-your-rights-lawn-signs-and-first-amendment
Campaign yard sign rules are prevalent. Many of my customers have limits on time signs can be up. I have not heard much complaint from campaigns about this but it is interesting to see the rules of various locations for campaign yard signs.