St. Peters, MO Animal Ordinances: Chickens & Livestock (2026)

St. Peters splits farm-animal rules across two Animal Regulations sections. Section 205.070(E) governs hens specifically: a resident needs a Hen Permit issued under Section 205.106 before keeping chickens, and even with a permit, hens are allowed only on lots of one acre or more, roosters are banned outright and can't be raised or housed in any coop or pen, and the property-wide cap is eight hens regardless of lot size. The $100 non-refundable Hen Permit application under Section 205.106 requires notifying every property owner within 75 feet by certified mail, written verification that any Homeowners Association has been told of the plan, and a City Health Official inspection before and after issuance.

Larger livestock falls under Section 205.120(E) instead: horses, cattle, ducks, sheep and other farm animals may be kept only in conjunction with an actual farming operation or riding stable, any stable, barn or shed sheltering them must sit at least 50 feet from any property line, and a horse or pony specifically needs a lot of at least three acres. The two sections overlap for chickens: 205.120(E)(2) requires hen enclosures to be predator-proof, in good repair, and adequately spaced per Section 205.020, on top of the one-acre minimum and permit duty set by Section 205.070(E).