US State

Cannabis and hemp laws

Colorado

Recreational and medical marijuana legal; THCA and hemp delta-9 restricted; delta-8, delta-10 and HHC illegal

Adult use
Legal
Medical
Legal
Last reviewed
May 27, 2026

Colorado

Cannabinoid status board

All states and compounds

Delta-10 THC

Illegal

Limits

Delta-10 THC is produced by chemical conversion and falls inside the SB 23-271 synthetic-cannabinoid exclusion. It is not lawful at hemp retail in Colorado.

Key law

Colorado SB 22-205 (2022); SB 23-271 (2023); 6 CCR 1010-24 (CDPHE); MED rules (Department of Revenue); synthetic cannabinoid exclusion

Effective

July 1, 2023

Full rules

Delta-8 THC

Illegal

Limits

Delta-8 produced by chemical conversion from CBD is excluded from the legal hemp definition under SB 23-271. Sales outside the MED-licensed cannabis system are not permitted.

Key law

Colorado SB 22-205 (2022); SB 23-271 (2023); 6 CCR 1010-24 (CDPHE); MED rules (Department of Revenue); synthetic cannabinoid exclusion

Effective

July 1, 2023

Full rules

Delta-9 THC

Restricted

Limits

CDPHE safe harbor for compliant hemp-derived delta-9 products: 1.75 mg delta-9 per serving with a CBD-to-THC ratio of at least 15:1. Products exceeding the safe harbor must route through the MED-licensed cannabis system.

Key law

Colorado SB 22-205 (2022); SB 23-271 (2023); 6 CCR 1010-24 (CDPHE); MED rules (Department of Revenue); total-THC framework; safe harbor for low-dose products

Effective

July 1, 2023

Full rules

HHC

Illegal

Limits

HHC is produced by hydrogenation and falls inside the SB 23-271 synthetic-cannabinoid exclusion. It is not lawful at hemp retail in Colorado.

Key law

Colorado SB 22-205 (2022); SB 23-271 (2023); 6 CCR 1010-24 (CDPHE); MED rules (Department of Revenue); synthetic cannabinoid exclusion

Effective

July 1, 2023

Full rules

THCA

Restricted

Limits

Total THC computed as delta-9 + (0.877 x THCA) measured against 0.3% dry weight at harvest. Intoxicating hemp products at retail subject to per-serving caps under SB 23-271 and CDPHE 6 CCR 1010-24. Higher-potency cannabis flower sold only through MED-licensed dispensaries (Amendment 64 system).

Key law

Colorado SB 22-205 (2022); SB 23-271 (2023); 6 CCR 1010-24 (CDPHE); MED rules (Department of Revenue); total-THC framework

Effective

July 1, 2023

Full rules

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Colorado

Latest news and analysis

All news

Colorado's 2026 MED Regulatory Overhaul: What Changed and What Other Markets Can Learn

Colorado 2025: Teen Privacy Rules Meet Cannabis E‑Commerce—Consent, Profiling Limits, and Universal Opt‑Out

Colorado Privacy Act amendments effective October 2025 raise minor-consent, profiling, and universal opt-out duties for cannabis and hemp e-commerce retailers.

Colorado's 2025 Playbook for Intoxicating Hemp: Ratios, mg Caps, and Safe Harbor Compliance

Colorado's 6 CCR 1010-24 sets one of the toughest hemp regimes nationally: cannabinoid mg caps, CBD:THC ratios, and a safe harbor framework for 2025.

Colorado's 2026 MED Regulatory Overhaul: What Changed and What Other Markets Can Learn

Colorado 2025: Teen Privacy Rules Meet Cannabis E‑Commerce—Consent, Profiling Limits, and Universal Opt‑Out

Colorado Privacy Act amendments effective October 2025 raise minor-consent, profiling, and universal opt-out duties for cannabis and hemp e-commerce retailers.

Colorado's 2025 Playbook for Intoxicating Hemp: Ratios, mg Caps, and Safe Harbor Compliance

Colorado's 6 CCR 1010-24 sets one of the toughest hemp regimes nationally: cannabinoid mg caps, CBD:THC ratios, and a safe harbor framework for 2025.

FAQ

Common questions

Is marijuana legal in Colorado?

Recreational marijuana is legal in Colorado. Medical marijuana is legal.

Is THCA legal in Colorado?

Restricted at hemp retail. Colorado measures THC on a total-THC basis after decarboxylation under Senate Bill 23-271, which means THCA counts toward the 0.3 percent ceiling.

Is delta-8 THC legal in Colorado?

No. Senate Bill 23-271 added a synthetic-cannabinoid exclusion to Colorado's hemp definition effective July 1, 2023. Delta-8 produced by chemical conversion from CBD falls inside that exclusion and is not lawful at hemp retail.

Is hemp-derived delta-9 THC legal in Colorado?

Restricted. Hemp-derived delta-9 may be sold at Colorado hemp retail only inside a narrow CDPHE safe harbor: no more than 1.75 mg of delta-9 per serving and a CBD-to-THC ratio of at least 15:1.

This is general information, not legal advice.

Seed Legality

Colorado retail stores sell seeds; Amendment 64 protects adult possession, 6-plant home grow, and gifting.
Hemp seeds
Legal
Marijuana seeds
Legal
Sale
Legal
Transacting
Legal
Gifting
Legal

Colorado Constitution art. XVIII, § 16 (Amendment 64) makes it lawful for adults 21+ to possess, grow up to six plants (three flowering), and transfer up to one ounce or six immature plants to another adult without remuneration — seeds are within the constitutional definition of marijuana. Licensed retail marijuana stores and cultivations may sell seeds and immature plants to consumers under the Marijuana Enforcement Division's Retail Marijuana Rules (1 CCR 212-3). Hemp growers must register with the Colorado Department of Agriculture under C.R.S. Title 35, Article 61, but viable hemp seed is freely bought and sold as agricultural seed.

Key law:
Colo. Const. art. XVIII, § 16; 1 CCR 212-3; C.R.S. § 35-61-101 et seq.
Last reviewed:
July 3, 2026
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This section is provided for informational purposes only and is not legal advice. Seed laws change frequently — verify current law with qualified counsel before making decisions.
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