Felony DUI in Colorado
Colorado ordinarily treats DUI, DUI per se, and DWAI as misdemeanor offenses. However, a fourth or subsequent qualifying impaired-driving offense can be charged as a class 4 felony. Colorado created felony DUI in 2015, significantly increasing the consequences for repeat impaired-driving offenders.
A felony DUI conviction can result in a Department of Corrections prison sentence, substantial fines, probation with mandatory jail or alternative sentencing, alcohol and drug treatment, continuous alcohol monitoring, driver’s-license revocation, ignition interlock requirements, and long-term consequences associated with having a felony conviction.
Unlike many states, Colorado does not use a short lookback period that automatically disregards old DUI convictions. Prior DUI, DUI per se, DWAI, and certain comparable convictions can potentially count regardless of how long ago they occurred.
If you have been charged with felony DUI, you should consider speaking with an experienced Colorado DUI defense attorney immediately. In addition to challenging the new DUI allegation, an attorney can examine whether each of the alleged prior convictions legally qualifies to support felony prosecution.
Denver Felony DUI Attorney
A felony DUI charge can threaten your freedom, driving privileges, employment, housing, professional licensing, and future. The prosecution must prove not only the current impaired-driving charge but also the prior qualifying convictions necessary to elevate the offense to a felony.
Attorney Matthew Martin can investigate the traffic stop, field sobriety exercises, breath or blood testing, body-camera recordings, alleged chemical-test refusal, and the validity of the prior convictions being used against you. He can also represent you in the separate DMV proceeding involving your driving privileges.
Call The Law Office of Matthew Martin at 303.725.0017 to schedule a free initial consultation. The Law Office of Matthew Martin represents clients throughout the greater Denver area and surrounding counties, including Adams County, Arapahoe County, Douglas County, Broomfield County, Boulder County, and Jefferson County.
Overview of Felony DUI Charges in Denver, Colorado
- When Does DUI Become a Felony in Colorado?
- Penalties for Felony DUI in Colorado
- Probation Instead of Prison for Felony DUI
- Continuous Alcohol Monitoring
- License and Ignition Interlock Consequences
- What if the BAC Was 0.15 or Higher?
- Felony DUI Vehicular Assault in Colorado
- Felony DUI Vehicular Homicide in Colorado
- Common Defenses to Felony DUI
- Can a Felony DUI Be Reduced or Dismissed?
- Collateral Consequences of a Felony DUI
- Can a Felony DUI Be Sealed in Colorado
- Additional Resources
When Does DUI Become a Felony in Colorado?
Under Colorado law, DUI, DUI per se, or DWAI becomes a class 4 felony when the defendant has three or more prior qualifying impaired-driving convictions. In practical terms, this usually means that a fourth or subsequent qualifying offense can be prosecuted as felony DUI.
The prior convictions may include:
- DUI;
- DUI per se;
- DWAI;
- Vehicular assault involving alcohol or drugs;
- Vehicular homicide involving alcohol or drugs; and
- Comparable impaired-driving offenses from another state or U.S. territory.
Colorado generally considers a person’s lifetime impaired-driving history. A conviction from ten, twenty, or more years ago may therefore still count toward felony DUI if it qualifies under Colorado law. The felony DUI statute was enacted in 2015, but qualifying convictions that occurred before 2015 can still be used when determining whether a later offense constitutes a fourth or subsequent violation.
The prosecution must establish the prior convictions. An attorney may examine whether the records identify the correct person, whether an out-of-state conviction is legally comparable to a Colorado offense, and whether the prior disposition actually qualifies for enhancement.
Penalties for Felony DUI in Colorado
Felony DUI is a class 4 felony. If the court imposes a prison sentence, the ordinary presumptive sentencing range for a class 4 felony is:
- Two to six years in the Colorado Department of Corrections;
- A fine of $2,000 to $500,000;
- Three years of mandatory parole following a prison sentence; and
- Other court costs, surcharges, treatment, and supervision requirements.
Colorado’s current felony sentencing scheme provides a two-to-six-year presumptive range for ordinary class 4 felonies.
However, prison is not automatic in every felony DUI case. Colorado law specifically permits courts to consider probation and community-based sentencing. When deciding whether to send someone to the Department of Corrections, the court must consider whether reasonable and appropriate alternatives have been exhausted and whether incarceration is the most appropriate response.
A felony conviction can also result in:
- Driver’s-license revocation;
- Ignition interlock restrictions;
- Level II alcohol or drug education and treatment;
- Continuous alcohol monitoring;
- Community service;
- SR-22 insurance requirements;
- Probation supervision;
- Restrictions on alcohol and drug use; and
- Significant collateral consequences associated with felony status.
Probation Instead of Prison for Felony DUI
If a judge sentences a felony DUI defendant to probation rather than the Department of Corrections, Colorado law still requires a substantial period of incarceration as a condition of probation.
The court generally must impose one of the following:
County Jail – At least 90 days and up to 180 days in county jail. During the mandatory 90-day portion, the defendant generally cannot receive ordinary good-time deductions or trusty status, although credit is given for qualifying time already served.
Alternative Sentencing Program – At least 120 days and up to two years in county jail through an authorized alternative sentencing program, such as work release, when such a program is available and the statutory requirements are satisfied.
A probation sentence also requires 48 to 120 hours of useful public service. The mandatory community-service requirement cannot simply be suspended.
In addition, a person sentenced to probation for felony DUI generally must undergo alcohol or drug evaluation, treatment, testing, and supervision.
Continuous Alcohol Monitoring
Colorado generally requires at least 90 days of continuous alcohol monitoring when a person is sentenced to probation for a felony DUI, DUI per se, or DWAI.
Monitoring may involve:
- A transdermal alcohol-monitoring device;
- Remote breath testing;
- Ignition interlock monitoring;
- Another approved alcohol-monitoring system; or
- A combination of monitoring methods.
The court can make limited exceptions if continuous monitoring would not serve the interests of justice or if the defendant lives somewhere a monitoring device cannot reasonably be obtained.
A failed test, tampering with a monitor, or other probation violation can result in stricter supervision, additional jail, or revocation of probation.
License and Ignition Interlock Consequences
A felony DUI conviction can also produce serious DMV consequences. A person with multiple impaired-driving convictions may face a lengthy driver’s-license revocation and must generally satisfy reinstatement requirements before legally driving again.
Those requirements may include:
- Completing or enrolling in Level II alcohol or drug treatment;
- Filing proof of SR-22 insurance;
- Paying reinstatement fees;
- Installing an approved ignition interlock device;
- Maintaining an interlock-restricted license for the required period; and
- Satisfying any other active DMV restraints.
Colorado law also requires a person on parole following a felony DUI prison sentence to use an approved ignition interlock device for the entire period of parole.
Separate administrative penalties can also arise from a BAC of at least 0.08 or a chemical-test refusal, regardless of the final criminal disposition.
What if the BAC Was 0.15 or Higher?
A BAC of 0.15 or higher results in designation as a persistent drunk driver under Colorado law. This designation may lead to additional requirements involving:
- Level II alcohol and drug treatment;
- Ignition interlock;
- SR-22 insurance;
- More demanding license-reinstatement requirements; and
- Increased supervision.
A high BAC does not itself create felony DUI. A first DUI with a BAC of 0.15 or higher remains a misdemeanor unless another basis for felony prosecution exists. Felony status ordinarily comes from the defendant’s prior qualifying convictions or from a separate felony arising out of the driving incident.
Felony DUI Vehicular Assault in Colorado
A person can also face felony charges on a first DUI when impaired driving causes serious bodily injury to another person.
Vehicular assault generally applies when a person drives under the influence of alcohol or drugs and that conduct is the proximate cause of serious bodily injury to another person.
Serious bodily injury can include injuries involving:
- A substantial risk of death;
- Serious permanent disfigurement;
- Protracted loss or impairment of a bodily function or organ;
- Broken or fractured bones; or
- Serious second- or third-degree burns.
A DUI-based vehicular assault is currently a class 4 felony, exposing the defendant to the ordinary class 4 felony sentencing range of two to six years in prison and a fine of $2,000 to $500,000.
Importantly, Colorado enacted SB 26-072 in 2026, which will make vehicular assault and vehicular homicide statutory crimes of violence and substantially increase sentencing consequences. That change takes effect September 1, 2026; it is not yet effective as of August 7, 2026.
Felony DUI Vehicular Homicide in Colorado
Vehicular homicide is substantially more serious. DUI vehicular homicide generally occurs when a person drives while under the influence of alcohol or drugs and that conduct is the proximate cause of another person’s death.
DUI vehicular homicide is currently a class 3 felony. The ordinary presumptive sentence for a class 3 felony is:
- Four to 12 years in prison;
- A fine of $3,000 to $750,000; and
- Mandatory parole following release.
The prosecution does not have to prove that the driver intended to kill anyone. The criminal allegation is based on impaired driving causing the death.
A defendant may also face restitution for funeral expenses, lost income, and other legally compensable losses. The victim’s family may separately pursue a civil wrongful-death action.
As noted above, beginning September 1, 2026, Colorado’s new law will classify vehicular homicide and vehicular assault as crimes of violence, producing substantially enhanced sentencing rules for offenses committed after the new provisions become effective.
Common Defenses to Felony DUI
Having three prior DUI convictions does not prove the current charge. The prosecution still must prove the new DUI, DUI per se, or DWAI beyond a reasonable doubt.
Possible defenses include:
Unlawful Traffic Stop – Police generally need a lawful basis to stop the vehicle. Evidence obtained after an unconstitutional stop may be suppressed.
No Proof of Driving or Actual Physical Control – Prosecutors may be unable to establish who drove or whether a person found in a parked vehicle actually exercised control over it.
Unreliable Breath Testing – Calibration problems, equipment maintenance, operator error, mouth alcohol, medical conditions, or improper testing procedures may undermine a breath result.
Problems With Blood Testing – Blood evidence may be challenged based on collection, storage, contamination, labeling, chain of custody, laboratory procedures, or analytical accuracy.
Rising Blood Alcohol – A person’s BAC can rise after driving stops. A later test may therefore show a higher concentration than existed at the time the person was actually driving.
Insufficient Drug-Impairment Evidence – The presence of marijuana, prescription medication, or another drug does not automatically prove impairment.
Alternative Explanations for Alleged Impairment – Fatigue, injuries, anxiety, medical conditions, uneven pavement, weather, and other circumstances may affect field sobriety performance or mimic symptoms associated with impairment.
Invalid Prior Convictions – The defense may challenge whether one or more alleged prior convictions legally qualify toward felony DUI.
Out-of-State Conviction Issues – An offense from another jurisdiction may not count if its elements are not sufficiently comparable to a qualifying Colorado offense.
Can a Felony DUI Be Reduced or Dismissed?
Yes, depending on the evidence. A felony DUI charge may potentially be dismissed, reduced, or resolved as a misdemeanor if prosecutors cannot prove the new impaired-driving offense or cannot establish the necessary prior convictions.
Potential outcomes may include:
- Dismissal;
- Acquittal at trial;
- Reduction from DUI to DWAI;
- Reduction from felony DUI to misdemeanor DUI;
- Suppression of breath or blood evidence; or
- A negotiated sentencing disposition.
For example, if prosecutors allege four DUI offenses but one of the three claimed priors does not legally qualify, the current offense may no longer meet the requirements for felony DUI.
Colorado restricts plea bargaining in DUI cases, so a prosecutor generally needs a good-faith evidentiary basis for reducing an impaired-driving charge rather than simply offering a reduction as a matter of convenience.
Collateral Consequences of a Felony DUI
The consequences of felony DUI can continue long after the criminal sentence is completed. A felony record may affect:
- Employment;
- Professional licensing;
- Housing;
- Educational opportunities;
- Loans and financial services;
- Security clearances;
- Commercial driving privileges;
- Immigration status;
- Firearm possession;
- Child custody matters;
- Insurance;
- Government employment; and
- Future criminal sentencing.
A felony DUI conviction can also make later criminal cases substantially more serious and may influence how prosecutors and judges evaluate bond, probation, and sentencing.
Can a Felony DUI Be Sealed in Colorado?
A Colorado felony DUI conviction generally cannot be sealed through the ordinary conviction-sealing process.
A felony DUI charge that is dismissed or results in an acquittal may be eligible for non-conviction record sealing, depending on the final disposition of the entire case.
Because the conviction generally remains publicly accessible and may carry lifelong collateral consequences, challenging the charge before conviction is particularly important.
Additional Resources
Felony DUI Sentencing | Colorado General Assembly – Review the law establishing mandatory county-jail or alternative-sentencing requirements when a felony DUI defendant receives probation rather than a Department of Corrections sentence.
Alcohol Monitoring for Repeat and Felony DUI Offenders | Colorado General Assembly – Review Colorado’s requirement for at least 90 days of continuous alcohol monitoring during probation following felony DUI or another third or subsequent impaired-driving offense.
Felony DUI Lawyer in Denver, Colorado
A felony DUI is substantially more serious than an ordinary first, second, or third DUI. A conviction can result in prison or mandatory county-jail time, substantial fines, intensive probation, continuous alcohol monitoring, treatment, license revocation, ignition interlock, and the lasting consequences of a felony record.
Attorney Matthew Martin can review the current DUI evidence and each prior conviction being used to support the felony charge. He can challenge an unlawful traffic stop, unreliable chemical testing, improper field sobriety procedures, questionable prior convictions, or causation allegations arising from a DUI crash.
Call 303.725.0017 to schedule a free initial consultation. The Law Office of Matthew Martin represents clients throughout Denver and surrounding areas, including Adams County, Douglas County, Jefferson County, Arapahoe County, Broomfield County, and Boulder County.