Under Wisconsin's Smoke-Free Air Law (Act 12), smoking is prohibited in virtually all enclosed public places and workplaces, and this includes hotels and motels. The ban covers all indoor areas: guest rooms, lobbies, hallways, restaurants, bars, meeting rooms, and common areas.
The law provides a narrow exception for designated smoking rooms, but the requirements are strict:
In practice, very few hotels maintain such rooms due to the cost and complexity of compliance. Most major chains and independent properties in Wisconsin are now 100% smoke-free indoors.
Additionally, smoking is prohibited within 8 feet of any entrance, exit, or operable window of a public building or workplace, including hotels. This means you cannot smoke right outside the lobby doors or near ground-floor room windows.
Bottom line: Assume your Wisconsin hotel is entirely smoke-free. If you smoke, ask at check-in about designated outdoor smoking areas, which are typically located away from entrances and air intakes.