How Many Cannabis Plants Can You Grow in Colorado? (2026 Rules)
Quick answer: Adults 21 and older in Colorado can grow up to 6 cannabis plants each, with no more than 3 mature and flowering at once. A home is capped at 12 plants no matter how many adults live there, unless local law expressly allows more. Everything has to be in an enclosed, locked space.
Last verified: October 30, 2026, against the 2026 Colorado Revised Statutes and Constitution. Laws change, so check the official site before you plant.
| Who can grow | Adults 21+. Medical patients and caregivers follow separate rules. |
|---|---|
| Plant limit per adult | 6 plants |
| Household limit | 12 per residential property, however many people live there, unless local law expressly allows more |
| Mature vs immature | No more than 3 of your 6 can be mature and flowering |
| Where plants can be | Enclosed, locked space; not open or public |
| License or registration | None for adults growing within the limits |
| Over-the-limit penalty | From a fine of up to $1,000 for a first offense over 12 plants, up to drug felonies |
How the limit works
Colorado stacks two limits on top of each other. The first comes from the state constitution: Article XVIII, Section 16 lets each adult grow up to 6 plants, with 3 or fewer mature and flowering. The second comes from C.R.S. § 18-18-406: no more than 12 plants on or in a residential property, medical or recreational.
- Two adults at home: 6 plants each, so 12 total, with up to 6 flowering (3 each).
- Three adults at home: the math says 18, but the cap says 12.
For this statute, a “plant” is one in a growing medium that’s more than 4 inches wide or high, or any flowering plant regardless of size.
One trap: you can’t keep a friend’s plants at your place. Under § 18-18-406(3.5), holding a plant you’re growing for someone else breaks the law unless you’re that person’s medical caregiver and following the caregiver rules.
Local exceptions and medical counts
The 12-plant cap has two ways around it, and neither is automatic:
- Local law: You’re not in violation if your county or city expressly permits more than 12 on a residential property, you stay within that local limit, and the plants are in an enclosed, locked space.
- Medical patients: Under C.R.S. § 25-1.5-106(8.5), a patient can reach 24 plants on a residential property if the local government doesn’t limit residential plant counts, the patient registers with the state licensing authority’s registry, and the patient gives any local notice required. Caregivers have a parallel rule. An extended plant count doesn’t lift these residential caps by itself.
Where you can grow
The constitution requires growing in an enclosed, locked space that isn’t conducted openly or publicly. Colorado law defines both words in § 18-18-102:
- Enclosed: a permanent or semi-permanent area covered and surrounded on all sides. Opening a window or door for a while doesn’t change that.
- Locked space: secured at every entry point with a lock, such as a key or combination lock.
Inside a home, the rule depends on who’s around:
- Someone under 21 lives there: the grow area itself must be enclosed and locked.
- Nobody under 21 lives there: the home’s external locks count as the enclosed, locked space.
- Someone under 21 visits: you must reasonably restrict access to the grow for as long as they’re there.
Renters, landlords and local rules
Renting? Your landlord gets a say. Section 16(6)(d) of the constitution says anyone who occupies, owns or controls a property can prohibit or regulate growing there. If your lease bans it, the state’s home-grow right won’t override that. Whether that language reaches HOA rules isn’t spelled out, so read your covenants and ask before you plant.
Local rules matter too. A 2019 Legislative Council brief reports that local plant caps are the most common home-grow ordinance. Douglas County, for example, limits a residence to 12 plants, medical or recreational. Many places also have nuisance rules on odor or noise. Rules differ by city and county, so look up your own code.
How much of your harvest can you keep?
The constitution lets you possess the marijuana your plants produce on the premises where they were grown, with no weight limit in that text, as long as it isn’t made available for sale. Away from home, the normal limit applies: having more than 2 ounces is an offense under § 18-18-406(4).
Can you give it away?
Yes, within limits. The constitution protects transferring 1 ounce or less to an adult 21 or older, with no payment. Section 18-18-406(5)(c) treats a free transfer of up to 2 ounces as a drug petty offense rather than a sale, so 1 ounce is the safe line. Gifts tied to any kind of payment are out under subsection (5.5). And your harvest can never be sold.
Where do you get seeds or clones?
From a licensed store. The state’s Marijuana Enforcement Division has said licensed stores may transfer seeds and immature plants to consumers under its rules.
What if you go over the limit?
There are two penalty tracks under § 18-18-406(3).
Going over the 12-plant residential cap:
- First offense: level 1 drug petty offense, with a fine of up to $1,000.
- Second or later offense, 13 to 24 plants: level 1 drug misdemeanor.
- Second or later offense, more than 24 plants: level 3 drug felony.
Unlawful cultivation in general, such as growing outside your legal allowance:
- 6 plants or fewer: level 1 drug misdemeanor.
- More than 6, up to 30 plants: level 4 drug felony.
- More than 30 plants: level 3 drug felony.
A charge under the 12-plant cap doesn’t rule out prosecution under other laws. And one plain reminder: home growing is still illegal under federal law, even where the state allows it. Recreational marijuana remains Schedule I, and the April 2026 move to Schedule III covers only state-licensed medical marijuana and FDA-approved products.
Colorado home grow FAQ
How many plants can two adults grow in Colorado?
Two adults sharing a Colorado home can grow 12 plants in total, 6 each, with no more than 6 flowering at once. They must be in an enclosed, locked space.
Can three adults grow 18 plants in one Colorado home?
Usually not. Colorado caps a residential property at 12 plants regardless of how many people live there. The exception is a county or city law that expressly allows more, and then you must stay within that local limit.
Can my landlord stop me from growing cannabis in Colorado?
Yes. The Colorado Constitution lets anyone who owns, occupies or controls a property prohibit or regulate growing marijuana there, so a lease can ban a home grow.
Do I need a license to grow at home in Colorado?
No. Adults 21 and older don’t need a state license to grow within the limits. Medical patients who want to reach 24 plants must register with the state’s registry and meet the other conditions.
For the bigger picture, see our Colorado marijuana law guide and marijuana cultivation for beginners.
Setting up a legal grow? See our guides to the best grow lights and grow tents.
