Adults 21+ in Denver may grow up to 6 marijuana plants per person, 12 per household maximum regardless of number of adults, under DRMC §38-176 and CO Amendment 64. Plants must be enclosed, locked, and not visible from public spaces. Rental properties may prohibit under landlord rules.
Colorado Amendment 64 (2012) legalized adult-use marijuana; CRS §18-18-406(3)(a) and implementing regulations authorize adults 21+ to cultivate up to 6 plants per person with no more than 3 mature/flowering at any time. Denver layered additional rules: DRMC §38-176 caps total plants per residential property at 12, regardless of how many adults live there (tightened from earlier higher limits in 2017 via Ordinance 17-0340). All cultivation must occur in a fully enclosed, locked space (garage, spare room, shed, or outdoor enclosed structure with solid walls/roof). Plants may not be visible from public property or from a neighboring property (no visible outdoor plants on balconies, open yards, or from sidewalks). Grow rooms must meet electrical code and ventilation requirements; odor that creates a nuisance violates DRMC §36 and §24. Landlords can prohibit cultivation in rental agreements and often do. HOAs can restrict under CC&Rs. Commercial-scale cultivation (growing for sale) requires a licensed Denver cannabis retail/cultivation facility and is prohibited in residential zones.
Exceeding plant limits: DRMC §38-176 citation $100 to $999 per plant over limit. Visible plants: nuisance citation $100 to $500. Unlicensed commercial cultivation: Class 1 misdemeanor or felony; state and local criminal charges.
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