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Colorado Drug Laws – Penalties & Best Legal Defenses

Colorado drug laws make it a crime to possess, sell, manufacture, or use controlled substances. However, penalties have gotten laxer for recreational use and possession.

For instance, it is now a misdemeanor rather than a felony to possess up to four grams of such narcotics as methamphetamine, cocaine, ecstasy, or heroin. If you are convicted of drug possession, you face only two years of misdemeanor probation instead of the standard six to 18 months in jail. Plus if you complete a drug diversion program, you can get your possession charge dismissed.

Meanwhile, it is no longer a violation of Colorado drug laws for adults 21 and older to possess psilocybin and up to two ounces of marijuana for recreational use.

Graphic that shows defenses to drug crime charges in Colorado, such as lack of possession or police entrapment In this article, our Denver criminal defense lawyers will address the following key issues regarding Colorado drug laws.

1. Lawful Drugs

Colorado allows possession of marijuana in limited circumstances if you are 21 or older. However, possession of more than two ounces – or of any amount by people under 21 other than medical marijuana – is a crime.

In addition, if you are 21 or older, Proposition 122 generally permits you to possess, grow, use and share magic mushrooms (psilocybin/psilocin) and other psychedelic drugs such as DMT (Dimethyltryptamine), mescaline, and iogaine.

As of 2025, Colorado can license “healing centers” where you can pay for a supervised mushroom experience using mushrooms from a licensed grower. Finally, it is legal to possess prescription opioids, stimulants, depressants, and other medications as long as your prescription is valid and current.

Federal Law

Marijuana and psychedelic possession are also illegal on federally owned property within the state of Colorado, which is subject to the more stringent requirements of 21 USC 812 — the federal Controlled Substances Act. Federal property includes:

  • National Parks,
  • Airports,
  • Courthouses,
  • The Veterans Administration,
  • HUD housing, and
  • Post offices.
Man in corner on floor with needle and pills
Colorado drug laws favor treatment over imprisonment when it comes to personal use – at least initially for drug possession charges.

2. Unlawful Drugs

The following controlled substances are illegal in Colorado unless you have a current and valid doctor’s prescription for them.

Illegal Drug Type Common Examples
Schedule I Heroin, ecstasy, LSD, PCP, and GHB (gamma-hydroxybutyrate).1
Schedule II Oxycodone (Oxycontin), hydrocodone (Vicodin), morphine, fentanyl, methadone, and stimulants such as cocaine and methamphetamine (but not methamphetamine precursors).2
Schedule III Barbiturates, ketamine, anabolic steroids, codeine, and Xyrem.3
Schedule IV Diazepam (Valium) and non-barbiturate sleep medications such as zolpidem (Ambien).4
Schedule V Suboxone (buprenorphine) and cough medicine with small amounts of codeine.5

Also illegal in Colorado is the possession of synthetic cannabinoids and salvia.

Close-up of hand-to-hand drug sale
Drug penalties depend on the drug’s schedule, quantity, and purpose, and whether there were aggravating factors.

3. Penalties

In Colorado, drug use (C.R.S. 18-18-404) and drug possession (C.R.S. 18-18-403.5) are usually misdemeanors carrying probation. Though possession of a controlled substance can be a felony when it involves more than four grams of Schedule I or II drugs or any amount of GHB, Ketamine, or flunitrazepam.

Colorado has many alternatives to jail time for low-level drug offenders, including specialized drug courts, Veterans Treatment Courts, and deferred sentencing.6

Meanwhile, it is usually a felony in Colorado to sell drugs (C.R.S. 18-18-405), manufacture drugs (C.R.S. 18-18-405), or manufacture imitation drugs (C.R.S. 18-18-422). Prison can last from months to decades. Plus your sentence will be enhanced if there were aggravating factors at the time of your drug crime, such as if you were:

  • on parole,
  • on probation,
  • on bond for another felony,
  • in confinement for a felony, or
  • an escapee from confinement for a felony.

Colorado’s criminal justice system has seven separate classes of drug crimes, as shown below, from least serious to most serious.

Drug Petty Offenses

The following three Colorado crimes are prosecuted as drug petty offenses:

  1. Possessing up to 2 ounces of marijuana in public (C.R.S. 18-18-406);
  2. Possessing prescribed controlled substances in a container they were not dispensed in, and being unable to show legal ownership (C.R.S. 18-18-413); and
  3. Possession of drug paraphernalia with the knowledge that it could be used as drug paraphernalia (C.R.S. 18-18-428).

Colorado drug petty offenses carry:

  • Up to $100 in fines and
  • For marijuana possession convictions, 24 hours of community service.

Level 2 Drug Misdemeanors

The following six Colorado crimes are prosecuted as level 2 drug misdemeanors:

  1. Abusing toxic vapors (C.R.S. 18-18-412);
  2. Unlawful use of a controlled substance (C.R.S. 18-18-404);
  3. Drug possession offense (C.R.S. 18-18-403.5) of more than 2 ounces of marijuana but not more than 6 ounces (or up to 3 ounces of marijuana concentrate);
  4. Conspiracy (C.R.S. 18-2-201) to commit a level 1 or 2 drug misdemeanor;
  5. Attempt (C.R.S. 19-2-101) to commit a level 1 or 2 drug misdemeanor; and
  6. Advertisement of drug paraphernalia (C.R.S. 18-18-430).

Colorado level 2 drug misdemeanors carry:

  • Up to 12 months of jail time and/or
  • $50 to $750 in fines.

However, the punishment for unlawful drug use is up to one year of probation, possibly 120 days in jail, and up to $500 in fines; for a third or subsequent conviction, unlawful drug use carries up to 180 days in jail.

Level 1 Drug Misdemeanors

Three Colorado crimes are prosecuted as level 1 drug misdemeanors:

  1. Unlawful drug possession (C.R.S. 18-18-403.5) of Schedule III-, Schedule IV-, or Schedule V drugs, or up to 4 grams of Schedule I- or II drugs, or drugs listed in part 2 or Article 18 of Title 18, not including flunitrazepam or ketamine;
  2. Marijuana possession of more than 6 ounces of marijuana or more than 3 ounces of marijuana concentrate; and
  3. Attempt (C.R.S. 18-2-101) to commit a level 4 drug felony.

Colorado level 1 drug misdemeanors carry:

  • 6 to 18 months of jail time and/or
  • $500 to $5,000 in fines.

However, unlawful drug possession carries up to two years of probation, possibly 180 days in jail, and up to $1,000 in fines; for a third or subsequent conviction, unlawful possession carries up to 364 days in jail.

Level 4 Drug Felonies

The following three Colorado crimes are level 4 drug felonies:

  1. Attempt (C.R.S. 18-2-101) to commit a level 3 drug felony;
  2. Selling controlled substances (C.R.S. 18-18-405) that include no more than 4 grams of Schedule III or Schedule IV drugs; and
  3. Possession of a controlled substance (C.R.S. 18-18- 403.5) that includes GHB, flunitrazepam, ketamine, or more than 4 grams of Schedule I or Schedule II drugs.

Certain level 4 drug felonies are wobblers, which can be reduced to a level 1 drug misdemeanor if you complete probation. Otherwise, level 4 drug felonies carry:

  • 6 months to 1 year in prison and/or $1,000 to $100,000 in fines,
  • a $1,500 surcharge, and
  • a 1-year mandatory parole period.

The maximum prison sentence becomes two years if there are aggravating factors.

Level 3 Drug Felonies

The following three Colorado crimes are prosecuted as level 3 drug felonies:

  1. Attempt (C.R.S. 18-2-101) to commit a level 2 drug felony;
  2. Selling controlled substances (C.R.S. 18-18-405) that include no more than 14 grams of Schedule I or Schedule II drugs (not Schedule III, schedule IV, or Schedule V drugs); and
  3. Distributing an imitation controlled substance (C.R.S. 18-18-422) to a minor if the adult is at least 2 years older than the minor.

In Colorado, level 3 drug felonies carry:

  • 2 to 4 years in prison and/or $2,000 to $500,000 in fines,
  • a $2,000 drug offender surcharge, plus
  • a 1-year mandatory parole period.

The prison term becomes four to six years if the case has aggravating factors.

Level 2 Drug Felonies

The following three Colorado crimes are prosecuted as level 2 drug felonies:

  1. Selling controlled substances (C.R.S. 18-18-405), more than 14 grams to up to 225 grams of a Schedule I or Schedule II controlled substance (not Schedule III, Schedule IV, or Schedule V);
  2. Unlawful sale or distribution of materials to manufacture controlled substances (C.R.S. 18-18-412.7); and
  3. Unlawful possession of materials to make methamphetamine and amphetamine (C.R.S. 18-18-412.5).

Colorado level 2 drug felonies carry:

  • 4 to 8 years in prison and/or $3,000 to $750,000 in fines,
  • a $3,000 drug offender surcharge, plus
  • a 2-year mandatory parole period.

The prison term becomes eight to 16 years if the case has aggravating factors.

Level 1 Drug Felonies

Colorado’s four most serious drug crimes are prosecuted as level 1 drug felonies:

  1. Selling controlled substances (C.R.S. 18-18-405) that include more than 225 grams of a Schedule I or Schedule II drug – or more than 112 grams of methamphetamine, heroin, ketamine, or cathinone – or more than 50 milligrams of flunitrazepam;
  2. Selling controlled substances (C.R.S. 18-18-405) that are Schedule I or II drugs to a minor, and the adult is at least 2 years older than the minor;
  3. Selling marijuana to a minor (C.R.S. 18-18-406) if there is more than 2.5 pounds of marijuana – or more than 1 lb. of marijuana concentrate – and if the adult is at least 2 years older than the minor; and
  4. Selling marijuana (C.R.S. 18-18-406) if the amount of marijuana is more than 50 pounds – or the amount of marijuana concentrate is more than 25 lbs.

Colorado level 4 drug felonies carry:

  • 8 to 32 years in Colorado State Prison,
  • $5,000 to $1,000,000 in fines,
  • a $4,500 surcharge, plus
  • a 3-year mandatory parole period.

The minimum prison term becomes 12 years if the case has aggravating factors.

Handcuffed hands on a table next to bundles of confiscated cocaine
Typical drug crime defenses include police entrapment, unlawful police search, and lack of possession.

4. Defenses

In our experience at Colorado Legal Defense Group, there are seven primary defenses we rely on to get drug charges lessened or dropped:

  1. Unlawful search and seizure: This defense argues that law enforcement violated your Fourth Amendment rights. If the police searched without a warrant, consent, or probable cause, any evidence obtained might be thrown out of court.7
  2. Lack of possession or ownership: Simply being near or in the same location as drugs does not automatically make you guilty of a drug crime. The prosecution must prove that you knowingly had control over the drugs. In shared spaces, like a home or a car, proving this can be challenging.
  3. Drugs belonged to someone else: This is a more specific version of the lack of possession defense. If we can show that the drugs belonged to another person, you might be able to avoid a conviction.
  4. Entrapment: If a law enforcement officer induced you to commit a drug crime that you would not have committed otherwise, this could be a case of entrapment.
  5. Missing drugs: In some cases, the actual drugs that serve as the main evidence might get lost. If the prosecution cannot produce the actual drugs at trial, it might be possible to argue for a dismissal.
  6. Lab analysis: Just because a substance looks like a drug does not mean it is. An official lab analysis is required to confirm that a seized substance is indeed an illegal drug. If the substance was not sent to a lab or the results are inconclusive, this defense could be used.
  7. Planted drugs: Although it is difficult to prove, if there is evidence that drugs were planted by law enforcement, the charges can be dismissed.

For you to be convicted of drug crimes in Colorado, prosecutors have to prove each element of the offense beyond a reasonable doubt. If we can show the D.A. that their evidence is too insufficient to sustain a guilty verdict, we may be able to get your charges reduced or dismissed.

Frequently Asked Questions

What happens if I get caught with a small amount of drugs like cocaine or heroin?

If you possess up to four grams of Schedule I or II drugs (like cocaine, heroin, meth, or ecstasy), it’s now a misdemeanor instead of a felony. You face up to two years of probation instead of jail time. If you complete a drug diversion program, you can get your possession charge dismissed completely.

How much marijuana can I legally have in Colorado?

Adults 21 and older can possess up to two ounces of marijuana for recreational use. Possessing more than two ounces is illegal, and any amount is illegal for people under 21 (except medical marijuana with proper authorization).

What are the penalties for selling drugs in Colorado?

Selling drugs is always a felony in Colorado. Penalties depend on the type and amount of drugs involved. For example, selling up to four grams of Schedule III or IV drugs is a Level 4 felony with six months to one year in prison. Selling larger amounts or more dangerous drugs carries much harsher sentences, up to eight to 32 years for Level 1 felonies.

Can police search me for drugs without a warrant?

Police generally need a warrant, your consent, or probable cause to search you legally. If they search without meeting these requirements, any drugs they find might be thrown out of court. This “unlawful search and seizure” defense is one of the most common ways to fight drug charges.

Is fentanyl possession always a felony in Colorado?

Yes. Due to recent legislative changes aimed at curbing overdose deaths, Colorado heavily penalizes fentanyl.

Possessing even trace amounts (under one gram) of any compound containing fentanyl is generally charged as a level 4 drug felony if the prosecution can prove you knew, or reasonably should have known, that the substance contained fentanyl. Possessing larger amounts or distributing fentanyl carries much harsher prison sentences.

Can I be charged with drug possession if police only find “residue”?

Under Colorado Revised Statutes (C.R.S. 18-18-403.5), you cannot be convicted of unlawful drug possession if the police only find microscopic amounts or “residue.” However, police can still use the presence of residue as probable cause to stop you, search your belongings, or charge you with a drug petty offense for possession of drug paraphernalia (such as a pipe or baggie).

Will I go to jail for a first-time drug possession charge?

It is highly unlikely for simple possession. Colorado’s drug laws favor rehabilitation and treatment over incarceration.

If you are caught with four grams or less of most Schedule I or II narcotics (like cocaine or meth), you will face a level 1 drug misdemeanor rather than a felony. First-time offenders are usually placed on probation or offered a drug diversion program. If you successfully complete the diversion program, your charges may be completely dismissed.

What is the difference between “actual” and “constructive” drug possession?

You do not need to have drugs physically in your pocket to be charged with a crime. Colorado recognizes two types of possession:

  1. Actual Possession: The drug is physically on your person (such as in your hand or pocket).
  2. Constructive Possession: The drug is not on your person, but it is in a location where you have “dominion and control,” such as your car’s glove compartment, your bedroom nightstand, or a shared apartment. To secure a conviction, prosecutors must still prove you knew the drugs were there.

Are “magic mushrooms” and psychedelics completely legal now?

For adults 21 and over, yes—with some limits. Under Colorado’s Natural Medicine Health Act (Proposition 122), it is entirely legal to possess, grow, use, and share (without payment) natural medicines like psilocybin, psilocin, DMT, and ibogaine.

However, you cannot legally sell them, and because they remain illegal under federal law, you can still be arrested for possessing them on federal land in Colorado, such as Rocky Mountain National Park or a federal courthouse.

Additional Reading

For more information, you may wish to visit our Colorado-specific articles on:

Cocaine, heroin, and pills on a black table
Selling drugs is always a felony in Colorado.

Additional Resources

If someone you know is OD-ing, you can call 911 without fear of arrest or prosecution for drug crimes thanks to Colorado’s Good Samaritan Law.8 If you or someone you know is suffering from drug addiction, you can find help at the following places:

You can obtain more information about both medical and retail marijuana in our article on Colorado Marijuana Laws or from the Colorado Department of Public Health and Environment’s marijuana information page.

Legal References:

  1. C.R.S. 18-18-203; People v. Holmberg (Colo.App. 1999) 992 P.2d 705. Schedule I drugs have a high potential for abuse and no accepted medical use, or those that are unsafe for use in treatment, even under medical supervision. Schedule 1 drugs include hallucinogens.
  2. C.R.S. 18–18–204; People v. Frantz (Colo.App. 2004) 114 P.3d 34. Schedule II drugs have a high potential for abuse, but they have an accepted medical use and can result in severe psychological and physical dependence if abused. Schedule II drugs include opium and prescription opioid pain pills.
  3. C.R.S. 18-18-205. Schedule II drugs have a lesser abuse potential than Schedule I or II drugs and have an accepted medical use but can lead to low or moderate physical dependence and high psychological dependence.
  4. C.R.S. 18-18-206. Schedule II drugs have a lower potential for abuse than Schedule III drugs and have an acceptable medical use but may lead to limited psychological and physical dependence. They include prescription anti-anxiety medications.
  5. C.R.S. 18-18-207. Schedule I drugs are the least dangerous drugs, with the lowest potential for abuse, a currently accepted medical use, and which are likely to lead to only limited physical or psychological dependence.
  6. C.R.S. 18–18–403.5; see also People v. Gonzales (Colo.App. 2017) 415 P.3d 846; People v. Yeadon (Colo. 2020) 462 P.3d 1087; see also House Bill 19 – 1263 and the Colorado Criminal Justice Reform Coalition. People v. Astacio (Colo.App. 2025) No. 23CA1076 (unpublished).
  7. See, for example, People v. Tafoya (Colo. 2021) 494 P.3d 613.
  8. C.R.S. 18-1-711.

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