Quiet hours in Rock County, WI — also called the noise ordinance, nighttime noise rules, or residential quiet time — define the hours during which excessive noise is prohibited.
Rock County sets no countywide quiet-hours schedule. Loud or annoying noise is handled by each city or town plus Wisconsin's disorderly-conduct law. In Janesville, making unnecessary and annoying noise is prohibited at any hour.
Rock County's own code has no fixed nighttime quiet window; the county's clear authority runs to zoning of consenting unincorporated towns, shoreland, health, and parks, not a general dB curfew. Inside Janesville, Municipal Code section 9.42.020 bars 'any unnecessary and annoying noise,' with no time cutoff. Beloit and the towns set their own nuisance rules. Statewide, Wis. Stat. 947.01(1) makes 'unreasonably loud' conduct that provokes a disturbance a crime regardless of the hour. Always check your specific city or town clerk for a local time-based schedule.
Janesville nuisance forfeitures typically run $25 to $500 plus prosecution costs. State disorderly conduct (947.01) is a Class B misdemeanor: up to 90 days jail and a $1,000 fine.
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