Felony DUI in Colorado: What It Means and What It Does Not
A felony DUI charge is serious, but it is not automatically a prison sentence, and it is not automatically provable just because the prosecutor says you have three priors. Both of those depend on facts that can be contested, and Colorado's own supreme court has weighed in on how.
Figures follow current Colorado statute text, checked September 26, 2026.
What Makes a DUI a Felony
A DUI, DUI per se, or DWAI becomes a class 4 felony once it follows three or more prior convictions, from separate and distinct criminal episodes, for any combination of the offenses below (C.R.S. § 42-4-1301(1)(a), (1)(b), (2)(a); § 42-4-1307(5)(a), (6)(a)).
DUI, DUI per se, or DWAI — Colorado or any other state
Vehicular homicide, C.R.S. § 18-3-106(1)(b)
Vehicular assault, C.R.S. § 18-3-205(1)(b)
Aggravated driving with a revoked license (former § 42-2-206(1)(b)(I)(A)/(B), before 8/5/2015)
Driving under restraint, C.R.S. § 42-2-138(1)(d)
Out-of-state priors count too
Colorado uses a functional-equivalence test: a conviction from any other state, or a U.S. territory, counts if the underlying act would have been DUI, DUI per se, DWAI, vehicular homicide or vehicular assault had it happened here — regardless of what that state calls the offense (C.R.S. § 42-4-1301(1)(j)).
A DWAI counts the same as a DUI, and there is no lookback
A prior DWAI weighs exactly as much as a prior DUI or DUI per se — there is no lesser weighting. Colorado also sets no age limit on a qualifying prior; a conviction from decades ago still counts toward the three-or-more threshold.
The Penalty — and Why Prison Is Not Automatic
Felony DUI is a class 4 felony. That sets the range if the court sends you to prison. It does not mean prison is the only lawful outcome.
If sentenced to prison
2 to 6 years in the Colorado Department of Corrections, a fine of $2,000 to $500,000, and 3 years of mandatory parole (C.R.S. § 42-4-1301(1)(a), (1)(b), (2)(a)).
If sentenced to probation instead
C.R.S. § 42-4-1307(6.5) expressly allows probation. Before choosing prison over it, the court must find that incarceration is "the most suitable option given the facts and circumstances" and that other sanctions are exhausted, unlikely to succeed, or an unacceptable risk to the public (§ 42-4-1307(6.5)(e)).
Jail as a condition
90 to 180 days in county jail — a mandatory-minimum portion that cannot be reduced (C.R.S. § 42-4-1307(6.5)(b)(I)).
Or work release
120 days to 2 years on work release, as an alternative to straight county jail (§ 42-4-1307(6.5)(b)(II)).
Monitoring
At least 90 days of continuous alcohol monitoring is required as a condition (§ 42-4-1307(6.5)(c)(II)).
Who Decides You Have Three Priors — and What Happens If They Never Asked
Linnebur v. People, 2020 CO 79M
The Colorado Supreme Court held that the fact of three or more prior convictions is a substantive element of felony DUI — something the prosecution must prove to a jury, beyond a reasonable doubt, not a sentencing fact a judge can find on a lower standard. Practically, that means the priors are not a formality: they have to be charged and proven like any other element of the crime.
People v. Crabtree, 2024 CO 40
Four years later, the Colorado Supreme Court held that when a trial court fails to submit the priors element to the jury, that is ordinary trial error, not structural error — so it does not automatically require a new trial on appeal. Colorado's usual case-specific and plain-error standards apply instead. The rule from Linnebur still stands, but the path to relief for a case decided under the older, pre-Linnebur procedure is now materially harder, not automatic.
If your case, or a prior conviction now being used against you, was tried before this line of cases settled, that history is worth raising with an attorney directly rather than assuming it resolves itself.
Monitoring Requirements Below the Felony Level
Continuous alcohol monitoring is not exclusive to the felony probation track above. For a second DUI or DWAI offense, the court may require it (C.R.S. § 42-4-1307(7)(b)(VI)(A)); for a third offense, the court shall require at least 90 days of it, unless the court finds that is not in the interest of justice or a monitoring device is unavailable locally (§ 42-4-1307(7)(b)(VI)(B)). Second and subsequent offenders must also complete a Level II alcohol and drug driving safety education or treatment program (§ 42-4-1307(7)(b)(I)). By the time someone reaches a felony-level fourth offense, in other words, they have usually already been through at least one round of mandatory treatment and monitoring — worth knowing when a court is deciding what "other sanctions" have already been tried.
Two Details That Get Overlooked
The 3 years of mandatory parole attached to a DOC sentence is not optional and not something a judge can waive — it runs after release from prison, on top of the 2-to-6-year range itself, and a parole violation can send someone back to custody separately from the original sentence.
Colorado also limits plea bargaining in any DUI case, felony or not: a court generally cannot accept a guilty plea to a non-alcohol, non-drug traffic offense from someone charged with DUI or DUI per se, absent a good-faith prosecutorial representation that the evidence does not support the original charge (C.R.S. § 42-4-1301(4)). At the felony level, that makes the strength of the prior-conviction proof, and of the underlying stop and test, central to any negotiation — not a formality to get past on the way to a deal.
Local Courts: Arapahoe County
Arapahoe County Justice Center
7325 S. Potomac Street, Centennial, CO 80112. Felony DUI is heard in Arapahoe County District Court, at the same address as Arapahoe County Court, in the 18th Judicial District (Arapahoe County alone since January 7, 2025).
Digital evidence in your case
Felony DUI cases turn heavily on the prior-conviction record: court minute orders, disposition records, and, for an out-of-state prior, the other jurisdiction's own paperwork, alongside the body-camera and dash-camera video and test records from the arrest itself. Forensic examination of that evidence is handled by our partner lab under attorney direction when the case calls for it.
Learn about digital forensics at our firmOther DUI Topics
Felony DUI FAQs
Straight answers, with the statute or case they come from
Related Pages
This page is general information about Colorado law, not legal advice for your situation, and reading it does not create an attorney-client relationship. The legal statements here were checked on September 26, 2026.
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