Are Mushroom Spores Legal in Colorado? Yes — and the Rules Are Different (2026)

By The Spore Source · Last checked against the statute: September 25, 2026

Intended use and disclaimer. We sell Psilocybe cubensis spore syringes for microscopy, taxonomy and educational use only, and we ship to Colorado. This page is general information, not legal advice; only a lawyer licensed in Colorado can tell you how the law applies to you.

In this guide

• What Colorado law says (and doesn’t say)
• Why spores are legal, in Colorado and everywhere
• Proposition 122 and the personal-use exception
• What is still illegal in Colorado
• Federal law has not changed
• Healing centers and the 2026 changes
• Paraphernalia in Colorado
• Denver’s 2019 ordinance, and its repeal
• Buying spores in Colorado
• Frequently asked questions
• Sources

What Colorado law says (and doesn’t say)

Colorado’s drug schedules are in the Uniform Controlled Substances Act, C.R.S. § 18-18-203. Schedule I, subsection (2)(c), the hallucinogens, controls “any material, compound, mixture, or preparation containing any quantity of” the substances listed, among them “(XXI) Psilocybin” and “(XXII) Psilocyn.” (Since 2025 the psilocybin entry excludes an FDA-approved prescription product, which does not exist yet.)

Spores are not mentioned anywhere in section 18-18-203, in the definitions in section 18-18-102, in the paraphernalia sections, or in the personal-use statute, section 18-18-434. The only fungus word in any of these laws is a sentence in section 18-18-434 saying that an ornamental “living plant” does not include “mushrooms or other fungal matter.” Colorado has never written spores or mycelium into its drug statutes.

The same schedule shows the difference. When the General Assembly wanted to control a whole organism, it said so: peyote is listed “whether growing or not, its seeds,” and marijuana is defined “whether growing or not, the seeds thereof.” Psilocybin and psilocyn are listed as chemicals only. They say nothing about seeds or spores.

Why spores are legal, in Colorado and everywhere

A spore contains no psilocybin and no psilocyn. Schedule I reaches material that “contains any quantity” of a listed substance; a spore contains none, so it is not a Schedule I material. The federal government reached the same conclusion: on January 2, 2024, the DEA’s Drug & Chemical Evaluation Section confirmed in writing that mushroom spores that do not contain psilocybin or psilocin are not controlled, and that the material becomes controlled once it contains psilocybin or psilocin, for example after germination. Our 50-state guide covers the federal position in detail.

Colorado’s definitions follow the same pattern as every other state’s: “manufacture” (§ 18-18-102(17)) means to “produce, prepare, propagate, compound, convert, or process” a controlled substance. What makes Colorado different is not that spores are treated differently. It is that, for adults, the state has removed its own penalties for the next step.

Proposition 122 and the personal-use exception

On November 8, 2022, Colorado voters approved Proposition 122, the Natural Medicine Health Act, by 1,296,992 votes to 1,121,124 (53.6 percent). It took effect on December 27, 2022, and the legislature rewrote it into the criminal code in 2023 (SB23-290), where it now sits at C.R.S. § 18-18-434.

The heart of it is subsection (5)(a): a person 21 or older who, “for the purpose of personal use and without remuneration, possesses, consumes, shares, cultivates” natural medicine “does not violate state law.” “Natural medicine” is defined by the chemicals, psilocybin and psilocin (plus DMT, mescaline other than peyote, and ibogaine), not by the organism. There is no possession limit for adults; the state’s Natural Medicine Division says so directly in its public guidance.

The exception has limits, and breaking each one is a “drug petty offense,” the lowest tier in Colorado’s drug code:

• Under 21: possessing or consuming natural medicine is a drug petty offense, with a fine of up to $100 or up to four hours of substance-use education.
• Public display or use is a drug petty offense.
• Cultivation beyond the limits is a drug petty offense with a fine of up to $1,000: the law caps personal cultivation at an area of “twelve feet wide by twelve feet long” per private property, counted cumulatively, and requires it to be in “an enclosed and locked space.”

Note what the exception does not say. It never mentions spores, because it does not need to: spores were never illegal. And because “natural medicine” is defined as the compounds, a spore syringe is not natural medicine either. It is simply outside the drug law, in Colorado as in every other state.

What is still illegal in Colorado

Proposition 122 is a personal-use exception, not a legalization of a market, and the parts of the drug code it did not touch still apply with full force.

• Selling. Subsection (5)(c) withholds the exception from anyone who sells or distributes natural medicine “for remuneration,” distributes to a person under 21, or distributes as part of “a business promotion or other commercial activity.” The state’s Natural Medicine Division says plainly that sales are “prohibited in both the regulatory framework and in the personal use space.” A sale falls back under C.R.S. § 18-18-405: a Level 3 drug felony (two to four years) for up to 14 grams of material containing a Schedule I substance, Level 2 (four to eight years) above 14 grams, and Level 1 (eight to 32 years) above 225 grams or for any transfer to a minor.
• Manufacturing extracts with hazardous solvents is a Level 2 drug felony under § 18-18-434(4)(c), the only felony the Act itself created.
• Driving. The right to consume “does not constitute a defense” to any driving offense.
• As of August 12, 2026, advertising and online sales. HB26-1325 amended subsection (5)(c) so that the personal-use protection no longer covers anyone who advertises natural medicine, runs a retail store or vendor booth, charges recurring fees, or makes “online sales that include natural medicine or natural medicine products.” A petition to put that section to a referendum needed 124,238 signatures by August 11, 2026; it does not appear on the Secretary of State’s 2026 ballot list.

Federal law has not changed

Psilocybin and psilocyn remain Schedule I under the federal Controlled Substances Act (21 C.F.R. § 1308.11(d)), and federal law defines manufacture to include propagation, in Colorado as everywhere. Proposition 122 changed what the State of Colorado prosecutes; it did not, and could not, change federal law. That is one reason our policy is the same in Colorado as in every other state: we sell spores for microscopy, taxonomy and educational use only, and we do not provide cultivation instructions or supplies.

Healing centers and the 2026 changes

The other half of Proposition 122 is a licensed system, the Natural Medicine Code (C.R.S. Title 12, Article 170), under which “healing centers” offer supervised psilocybin sessions. The Department of Revenue’s Natural Medicine Division began accepting license applications on December 31, 2024, and issued the first healing-center license on March 31, 2025. As of mid-September 2026 the state listed 11 standard and 35 “micro” healing centers, 14 licensed cultivators, 8 manufacturers and one testing lab. Licensed cultivation is limited by rule to Psilocybe cubensis, and the state’s guidance notes that “mycelium, spores, and growing fruiting bodies” do not count toward a licensee’s storage limit, the only place spores appear anywhere in Colorado’s rules.

HB26-1325 (signed June 4, 2026, effective August 12, 2026) added an ibogaine research pilot and a narrow “limited regulated natural medicine sales license” that lets a licensed cultivator or manufacturer transfer product to a healing center on the same premises, solely for use in an administration session. Mail-order and retail sale of mushrooms remain illegal. Separately, SB25-297 authorized pardons for past possession convictions, which Governor Polis announced in June 2025.

Paraphernalia in Colorado

Colorado’s paraphernalia sections (C.R.S. §§ 18-18-426 to 18-18-430.5) are mild by national standards, and Proposition 122 made them milder for natural medicine.

• The definition (§ 18-18-426) covers equipment used or intended for use in “planting, propagating, cultivating, growing, harvesting” a controlled substance “in violation of the laws of this state.” The factors a court may weigh (§ 18-18-427) include the owner’s statements, instructions and descriptive materials, advertising, how the item is displayed, and its legitimate uses in the community.
• Possession (§ 18-18-428) is a drug petty offense with a fine of up to $100. Sale or delivery (§ 18-18-429) and advertising (§ 18-18-430) are Level 2 drug misdemeanors.
• The exemption (§ 18-18-430.5(1)(c)): using equipment “in compliance with section 18-18-434” is not a paraphernalia offense, and the statute declares that use authorized for purposes of the federal paraphernalia law’s exemption.

For a spore buyer this changes little. A spore syringe sold for microscopy, with no cultivation instructions and no cultivation supplies, was never paraphernalia under the definition, and we sell it that way in Colorado as everywhere else.

Denver’s 2019 ordinance, and its repeal

Denver was the first city in the country to deprioritize psilocybin. Initiated Ordinance 301 passed on May 7, 2019, and made adult possession the city’s “lowest law enforcement priority” while creating a Psilocybin Mushroom Policy Review Panel. It never legalized anything, and it never mentioned spores. On March 3, 2025, the Denver City Council repealed it unanimously as obsolete, the same night it adopted licensing rules for healing centers, since state law had gone further than the ordinance ever did. No other Colorado city has a measure of its own; state law now bars local governments from imposing greater penalties than section 18-18-434 provides, and from banning licensed healing centers or facilitators.

Buying spores in Colorado

• It is legal to buy and own Psilocybe cubensis spores in Colorado for microscopy, taxonomy and educational use.
• Ordering online is legal. Federal mail rules bar controlled substances and paraphernalia; spores are neither. We ship to Colorado.
• Our policy does not change at the state line. Colorado’s personal-use exception is state law only; federal law still treats germination as manufacturing. We sell spores for microscopy, do not provide cultivation instructions, and cancel orders from customers who tell us they intend to cultivate, in Colorado as in every other state.

For neighboring states, see our guides to New Mexico, Utah, Kansas, Wyoming and Nebraska.

Frequently asked questions

Is it legal to buy mushroom spores in Colorado?

Yes. Colorado’s Schedule I covers psilocybin and psilocyn and says nothing about spores, which contain neither.

Is it legal to order mushroom spores online in Colorado?

Yes. There is no Colorado or federal law against mailing spores; the mail rules cover controlled substances and paraphernalia, and spores are neither.

Are Psilocybe cubensis spores legal in Colorado?

Yes. The species does not change the analysis; no Psilocybe spore contains a Schedule I substance.

Are psilocybin mushrooms legal in Colorado?

Under state law, an adult 21 or older may possess, share and cultivate them for personal use without payment, within the limits in C.R.S. § 18-18-434. Selling them is a felony, and they remain illegal under federal law.

Can you buy psilocybin mushrooms in Colorado?

You cannot legally buy psilocybin mushrooms to take home in Colorado. The only legal way to get psilocybin is a supervised session at a licensed healing center.

Does Proposition 122 mention spores?

No. It is written around the compounds psilocybin and psilocin. Spores contain neither and were legal before it passed.

Is Denver’s mushroom ordinance still in effect?

No. Ordinance 301 (2019) was repealed on March 3, 2025, because state law had overtaken it.

Do you ship spore syringes to Colorado?

Yes, to every Colorado address, for microscopy and taxonomy use only. The only states we exclude are California, Florida, Georgia and Idaho.

Sources

• C.R.S. § 18-18-203 — Schedule I (psilocybin and psilocyn at (2)(c)(XXI)–(XXII)), § 18-18-102 — definitions, § 18-18-434 — personal use of natural medicine, § 18-18-405 — unlawful distribution and manufacturing, §§ 18-18-426 to 430.5 — drug paraphernalia
• HB26-1325 (chaptered, effective August 12, 2026, PDF); SB23-290; SB25-297
• Colorado Secretary of State — 2022 Proposition 122 results
• Natural Medicine Division — frequently asked questions, unlicensed and unlawful activities, and license counts (September 2026)
• Denverite on the repeal of Ordinance 301 (March 3, 2025); Westword on the 2026 referendum petition
• 21 C.F.R. § 1308.11 — federal Schedule I and DEA letter on the federal status of spores (January 2, 2024, PDF)