Wisconsin prohibits ALL cannabis cultivation under Wis. Stat. Ch. 961 (Uniform Controlled Substances Act). No medical or recreational program exists. Growing any cannabis plant is a felony if 4+ plants, misdemeanor if fewer. Madison MGO 23.20 decriminalizes small-quantity possession but NOT cultivation.
Wisconsin Statute Chapter 961 classifies cannabis (marijuana) as a Schedule I controlled substance and prohibits cultivation of any quantity without DEA/state authorization. Unlike neighboring Illinois and Michigan, Wisconsin has no recreational program, and despite repeated legislative proposals, no medical marijuana program has been enacted as of 2026. Home cultivation of 4 or more plants is a Class H felony under Wis. Stat. §961.41(1)(h), punishable by up to 6 years imprisonment and $10,000 fine. Growing fewer than 4 plants is a Class I felony for first offenses (3.5 years and $10,000). Madison General Ordinances 23.20 decriminalizes possession of small amounts of cannabis within city limits to a $1 to $100 municipal forfeiture, but this does NOT extend to cultivation, which remains prosecutable under state law. Dane County District Attorney has historically exercised prosecutorial discretion on small personal-use cases, but Sun Prairie, Fitchburg, Middleton, Verona, Stoughton, and Monona follow state enforcement. Hemp cultivation under Wis. Stat. §94.55 with <0.3% THC is legal with DATCP license. CBD products meeting hemp standards are legal retail.
Cultivation under 4 plants: Class I felony, up to 3.5 years and $10,000. 4+ plants: Class H felony, up to 6 years and $10,000. Sales-quantity grow: higher felony classes under §961.41. Property subject to forfeiture.
Sun Prairie, WI
Sun Prairie regulates amplified music under the general noise ordinance. Sound amplification permits available for events. WI Stat. §947.01 applies.
Sun Prairie, WI
Sun Prairie considers excessive barking a nuisance. Animal control handles complaints. WI Stat. §174 covers dog regulation statewide.
Sun Prairie, WI
Sun Prairie enforces quiet hours typically 10 PM to 7 AM. Noise disturbances enforceable under WI Stat. §947.01 (Disorderly Conduct).
Sun Prairie, WI
Sun Prairie enforces alternate-side parking November through March and 48-hour maximum street parking. Snow emergencies declared during heavy snowfall ban pa...
Sun Prairie, WI
Sun Prairie restricts commercial vehicle parking in residential zones. Weight, size, and signage limits apply. Overnight heavy truck storage prohibited.
Sun Prairie, WI
Sun Prairie requires vehicles parked on improved surfaces. Front lawn parking prohibited. Driveway modifications require permits.
Side-by-side rule comparisons with other cities in Dane County.
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