Is It Legal to Grow Cannabis at Home in Colorado? (2026 Rules)

Jurisdiction: Colorado  |  Last verified: September 4, 2026  |  Program: Adult personal cultivation

Quick answer: Yes. A Colorado adult age 21 or older may grow up to six cannabis plants, with no more than three mature and flowering. A residential property may contain no more than 12 recreational plants total, regardless of the number of adults, and local rules may be more restrictive.

Colorado home-grow rules in plain language

• Minimum age: 21.
• Per-person limit: six plants.
• Mature flowering limit: three per adult.
• Residential property limit: 12 recreational plants total, regardless of the number of residents.
• Enclosure: the grow must be in an enclosed, locked space.
• Public exposure: cultivation cannot be conducted openly or publicly.
• No sales: home-grown cannabis may not be made available for sale.
• Local rules: counties and municipalities may impose additional restrictions.

How the plant limits work

Each adult’s six-plant allowance includes no more than three mature, flowering plants. The residence-wide 12-plant ceiling still applies, so three adults sharing a property cannot cultivate 18 recreational plants there.

Count all recreational plants on the residential property. Medical patient and caregiver cultivation has a separate framework and should not be combined with adult-use counts without checking the current state and local rules for that address.

What enclosed and locked means

Colorado defines an enclosed area as a permanent or semi-permanent space covered and surrounded on all sides. A locked space must be secured at every point of entry or exit with a locking mechanism designed to restrict access, such as a key or combination lock.

If someone under 21 lives at the residence, the cultivation area itself must be enclosed and locked. Even when every resident is 21 or older, the constitutional protection still requires the grow to be enclosed, locked and not conducted openly or publicly.

Before you start

1. Check local ordinances. Search the county and municipality for residential cannabis cultivation rules.
2. Count the whole property. Stay within the per-person maturity limits and the 12-plant residence cap.
3. Build a complete enclosure. Cover and surround the area on all sides.
4. Lock every access point. Keep minors, guests and unauthorized people out.
5. Keep it personal. Do not advertise or sell the harvest.

Official Colorado sources

• Colorado Constitution, Article XVIII, § 16
• Colorado Legislative Council: Personal cultivation laws
• Colorado General Assembly: Retail marijuana law summary

Ready to learn the cultivation side?

After confirming the local rules and securing the grow space, use the HWGrow complete beginner guide for a practical seed-to-harvest workflow.

Compare Colorado with the HWGrow U.S. cannabis home-grow law guide.

Colorado home-grow FAQ

How many cannabis plants may one Colorado adult grow?

An adult age 21 or older may grow up to six plants, with no more than three mature and flowering.

Can three Colorado adults grow 18 plants at one residence?

No. A residential property may contain no more than 12 recreational cannabis plants total, regardless of the number of residents.

Must a Colorado home grow be enclosed and locked?

Yes. Personal cultivation must occur in an enclosed, locked space and cannot be conducted openly or publicly.