Quick Answer
Is a DUI a Felony in Colorado?
In Colorado, a DUI is usually a misdemeanor, but it becomes a felony in two situations: when it is your fourth or later offense, or when impaired driving seriously injures or kills someone. A fourth DUI is a Class 4 felony under CRS 42-4-1301, and a crash that hurts someone can be charged as vehicular assault or vehicular homicide with no prior offenses required at all. Which path you are on changes everything about the case, so the first job is knowing which one you face.
When a DUI becomes a felony in Colorado
Most Colorado DUIs are misdemeanors. Of the 16,270 DUI cases Colorado recorded in 2024, the large majority were charged at the misdemeanor level (Colorado Crime Statistics, CDPS). A DUI only crosses into felony territory two ways: by offense number, or by harm.
Steve Prager, a Denver defense attorney and former prosecutor, frames the offense-number path around a single question the law is really asking. “The longer ago the prior is, the better it is,” he says, because the court is “trying to determine whether this is a habit, or if this was a mistake.” A pattern of repeat offenses is what pushes a case from misdemeanor to felony. The other path, serious injury or death, can make a single first-time DUI a felony on its own.
The fourth DUI: a Class 4 felony
A fourth or subsequent DUI in Colorado is a Class 4 felony. “Fourth plus is a Class 4 felony,” Prager says, “and if there’s no prison, you can get probation on it, but there has to be jail.” Under Colorado’s felony DUI law (HB17-1288), that carries a sentence of up to six years in prison and fines reaching $500,000, plus a mandatory minimum jail term even when the sentence is probation rather than prison.
The felony attaches to the number of prior convictions, not to how bad this particular arrest was. Someone with three old convictions and a clean recent record can still be charged with a felony on a fourth, which is why the details of your prior history matter as much as the current stop.
How priors stack: the five-year line and the lifetime lookback
Before the fourth offense, the penalties climb with each prior, and the most important fact is timing. By statute, a second DUI within five years carries a 10-day minimum jail sentence, and a third carries 60 consecutive days. After the fifth-year mark, the math changes.
“Within five years, you can still get work release, but not in-home detention,” Prager says. “Outside of five years, in-home detention opens up too.” That is why two DUIs spaced years apart can land in a very different place than two within the same year. Colorado uses a lifetime lookback for counting prior DUIs toward the felony threshold, but the five-year window is what controls which jail alternatives are on the table.
When one DUI is already a felony: injury and death
The second path needs no priors. If impaired driving seriously hurts or kills someone, the charge is no longer a simple DUI. Prager confirmed the statutes that govern these cases: vehicular assault under CRS 18-3-205, charged as a Class 4 felony, and vehicular homicide under CRS 18-3-106, charged at the Class 4 to Class 3 felony level.
These are the cases where a first-time driver with no record faces prison exposure, because the felony comes from the harm, not the history. They are also the cases where the early evidence work, the blood draw, the accident reconstruction, the causation question, matters most, and where having counsel immediately is not optional.
The aggravators that make a case worse
Two factors short of a felony can still change the sentence dramatically. A high test result is the first. “Above a .2 is mandatory jail,” Prager says. Between .15 and .2 a DWAI is very hard to get, but not impossible, and negotiating those reductions is something Prager does regularly. A child in the car is the second. “Child abuse will be charged if there’s a kid in the car,” he says, “and that is going to be significantly aggravated.” That child-abuse count comes with its own evaluation and class requirements, stacked on top of the DUI.
Neither one makes a first or second DUI a felony by itself, but both raise the floor on everything, and both compound when there are priors.
What a felony DUI leaves behind
A felony conviction follows you far past the sentence. “It’s not sealable,” Prager says of a Colorado DUI, “so it’s going to show up on background checks for the rest of your life.” A felony adds the loss of civil rights that misdemeanors do not touch, on top of the insurance, employment, and licensing consequences every DUI carries. With a 92 percent guilty-disposition rate across Colorado impaired-driving cases in 2024 (Colorado Division of Criminal Justice), the system is built to convert charges into convictions, which is the real argument for fighting the felony exposure at the front end.
How felony DUI cases are actually defended
A felony charge is not the same as a felony conviction, and the gap between them is where the defense lives. Prager’s approach starts with the chemical evidence. “A .08 is a tougher case at trial, but it’s defensible if everything is done right,” he says, and a marijuana case gives even more room, because it can be argued on conduct in a way an alcohol number cannot.
Even on a strong case for the prosecution, the work is in avoiding the felony. One route is structural: Prager has had real success getting the felony deferred in exchange for a plea to a misdemeanor DUI, which keeps a client out of the felony system entirely. He recently negotiated a reckless-driving plea on a fourth DUI charge, taking a case that carried felony exposure down to a far lesser offense. On a felony, that instinct, attack provability, attack the priors, attack the causation, and find the path that avoids the felony altogether, is what separates a prison sentence from a manageable outcome.
If you are facing a DUI that could be charged as a felony in Colorado, whether because of prior offenses or because someone was hurt, the exposure is serious enough that the first call matters. Getting the facts in front of a defense lawyer who has worked the other side of these cases is the highest-value thing you can do right now.
