Ontario residents 21 and older may grow up to 6 cannabis plants indoors per residence under Proposition 64, but outdoor cultivation is banned by OMC Chapter 9 ordinance.
California Proposition 64 (Adult Use of Marijuana Act), codified at Health and Safety Code 11362.1 and 11362.2, allows any adult 21 or older to cultivate up to 6 living cannabis plants for personal use inside their private residence. Proposition 64 allows cities to prohibit outdoor cultivation, and Ontario has exercised that authority: Ontario Municipal Code Chapter 9 prohibits all outdoor personal cannabis cultivation within the city limits. Indoor cultivation must occur inside a secure, locked, fully enclosed area that is not visible from a public place or from any place a minor could reasonably access. Lighting must meet the California Electrical Code with GFCI protection, grow rooms must meet building code ventilation standards, and odor cannot create a public nuisance under OMC Chapter 30. Landlords may prohibit cultivation in lease agreements under Civil Code 1947.5. Growing more than 6 plants, any commercial cultivation, or any outdoor cultivation in Ontario remains illegal and can trigger citation, abatement, and potential criminal charges under Health and Safety Code 11358.
Contact your local code enforcement office for specific penalty information.
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Side-by-side rule comparisons with other cities in San Bernardino County.
See how other cities in San Bernardino County handle home cultivation.
See how Ontario's home cultivation rules stack up against other locations.
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