Board Certified DUI Defense
Utah's Ten-Year DUI Look-Back Period
Since 1998Board CertifiedNCDD Faculty
How far back Utah looks at your record decides whether a new charge is a first offense, a second offense carrying mandatory jail, or a third-degree felony. The enhancement itself comes from Utah Code 41-6a-502(2), and it depends entirely on the definition of a qualifying "conviction" in Utah Code 41-6a-501(2). That single calculation drives the classification, the sentencing floor, the license action, and the shape of the defense.
Glen Neeley has analyzed look-back calculations in Utah DUI cases since 1998. He is a board-certified DUI defense specialist and a faculty member of the National College for DUI Defense. An enhancement built on a miscalculated window or on a prior that does not actually qualify is the difference between a misdemeanor and a felony, which is why every prior the State intends to use gets verified rather than accepted.
How the Ten-Year Window Is Actually Measured
Two separate statutes use a ten-year window, and they do not measure it the same way. Getting the measuring points right matters, because the common shortcut of assuming the clock simply runs from one arrest date to the next is not what either statute says. Arrest dates are not a measuring point anywhere in the law.
The criminal charge: Utah Code 41-6a-502(2)
A DUI is elevated to a class A misdemeanor under Utah Code 41-6a-502(2)(b)(iv) when the person has one qualifying prior conviction within ten years, and to a third-degree felony under Utah Code 41-6a-502(2)(c)(i) when the person has two or more qualifying priors, each within ten years. The statute measures the ten years from the prior conviction to either the current conviction or the date the current offense was committed. Because a conviction is entered after the arrest, measuring to the current conviction reaches further back in time, and that reading generally works against the defendant.
There is also a felony path with no ten-year limit at all. Under Utah Code 41-6a-502(2)(c)(ii), a DUI conviction entered at any time after a prior felony conviction under that section, including one that was later reduced under Utah Code 76-3-402, is a third-degree felony no matter how many years have passed. A prior felony never ages out.
The driver license sanction: Utah Code 41-6a-509
The Driver License Division runs its own clock. It measures whether the current offense was committed within ten years of the date of the prior violation. That is a different start point and a different end point from the criminal statute, so it is possible for the two tracks to reach different answers on the same set of dates. The license consequences are handled administratively and move on their own schedule, which is covered in more detail on our page about a DUI and your driver license.
| What Is Being Decided | Governing Statute | Clock Starts | Clock Ends |
|---|---|---|---|
| Criminal charge enhancement | Utah Code 41-6a-502(2) | Date of the prior conviction | The current conviction, or the date the current offense was committed |
| Driver license sanction | Utah Code 41-6a-509 | Date of the prior violation | Date the current offense was committed |
| Felony after a prior felony DUI | Utah Code 41-6a-502(2)(c)(ii) | No time limit applies | Any current DUI conviction, entered at any time after the prior felony |
| The "arrest to arrest" shortcut | Appears in no Utah statute | Not a statutory measuring point | Not a statutory measuring point |
The practical consequence of the correct rule is that a prior should never be assumed to have dropped off because the arrest dates look far enough apart. Conviction dates have to be pulled and verified. Cases sitting near the ten-year boundary deserve a date-by-date analysis, because a difference of days can move a charge from a class B misdemeanor to a class A misdemeanor, or from a misdemeanor to a felony.
The window also applies to each prior independently. Someone with two prior convictions needs both analyzed separately. If only one falls inside ten years, the current charge is a second offense. If both do, it is a third offense and a felony.
What Counts as a Qualifying Prior
A qualifying prior is broader than a prior DUI conviction. Utah Code 41-6a-501(2)(a) defines the term for enhancement purposes, and the list reaches well past Utah Code 41-6a-502 itself:
- A conviction for driving under the influence under Utah Code 41-6a-502
- A plea or conviction for impaired driving under Utah Code 41-6a-502.5, which the statute expressly treats as a qualifying prior
- Driving with any measurable controlled substance in the body under Utah Code 41-6a-517
- Refusal of a chemical test under Utah Code 41-6a-520.1(1)
- Automobile homicide under Utah Code 76-5-207, and certain vehicle-related offenses under Utah Code 76-5-102.1
- A conviction under a local ordinance that is substantially similar to the state DUI statute
- An out-of-state or military conviction for conduct that would violate Utah's DUI law
- A conviction whose judgment was later reduced under Utah Code 76-3-402, which still counts as a prior
Juvenile matters count too. Under Utah Code 41-6a-501(2)(c), an admission to a violation of Utah Code 41-6a-502 in juvenile court is treated as a conviction for enhancement purposes, even if it was later dismissed under the juvenile rules. That reach is easy to miss, which is one reason a juvenile DUI case deserves the same scrutiny as an adult one. Deferred and alternative dispositions need individual analysis to determine whether they trigger enhancement at all.
The statute of conviction is what controls, not the label on the original citation. A reduction from DUI to impaired driving under Utah Code 41-6a-502.5 still counts as a qualifying prior, while a plea to reckless driving under a non-DUI statute generally does not. That distinction is worth understanding before a case is resolved, not after.
Out-of-State Convictions Count Under Utah's Look-Back
Utah counts qualifying DUI convictions from other states. Under Utah Code 41-6a-501(2), a prior from another jurisdiction counts if the offense would constitute a violation of Utah's DUI law had it been committed in Utah. Prosecutors locate those records through the National Crime Information Center, driver-license compact databases, and routine interstate information sharing.
The "would be a violation in Utah" standard is not a formality. It requires reading the out-of-state statute against Utah's. Not every impaired-driving conviction elsewhere qualifies: some states use tiered offenses, some have lesser-included offenses, and some statutes cover conduct that Utah's DUI law does not reach. Pleas to reduced charges in other states add another layer, because a case that started as a DUI but resolved under a different statute may or may not count depending on what the person was actually convicted of.
What the Count Changes: Classification and Sentencing
The look-back is not an academic exercise. It sets the offense class, and the offense class sets the statutory minimum the court starts from once a conviction is entered. A first offense is a class B misdemeanor punishable by up to 180 days in jail, with a 120-day license suspension. A second offense inside ten years becomes a class A misdemeanor with a mandatory jail component and a two-year license revocation. A third offense inside ten years is a third-degree felony punishable by up to five years in prison.
| Qualifying Priors | Classification | Enhancement Statute | Jail Exposure |
|---|---|---|---|
| None | Class B misdemeanor | Utah Code 41-6a-502(2) | Up to 180 days, with a floor of not less than 2 days in jail or the compensatory service alternative in Utah Code 41-6a-505(3)(a)(i) |
| One qualifying prior within ten years | Class A misdemeanor | Utah Code 41-6a-502(2)(b)(iv) | Not less than 10 days in jail, often stated as 240 hours, or 5 days in jail plus a court-ordered term of home confinement, under Utah Code 41-6a-505(7)(a)(i) |
| Two or more qualifying priors, each within ten years | Third-degree felony | Utah Code 41-6a-502(2)(c)(i) | Up to 5 years in prison, with a statutory jail minimum and fine under Utah Code 41-6a-505(11) if the prison term is suspended |
| A prior felony DUI conviction, at any time | Third-degree felony | Utah Code 41-6a-502(2)(c)(ii) | Same felony exposure, with no ten-year limit on the prior conviction |
Every one of those minimums is written as an either-or. The court can impose the jail term or the statutory alternative attached to it, which is why a bare day count never tells the whole story. The full sentencing structure, including how the alternatives work in practice, is set out on our page covering Utah's DUI mandatory minimums.
Utah Code 41-6a-505(12)(a)(i) restricts a court's ability to suspend these minimums, but it is not an absolute bar. Utah Code 41-6a-505(12)(a)(ii) contains exceptions, and Utah Code 41-6a-505(4)(a) permits suspension while the person participates in a 24-7 sobriety program. Anyone told flatly that nothing can be suspended is getting an incomplete answer.
One point that is frequently confused: extreme DUI does not change the offense classification. Utah Code 41-6a-501(1)(f) defines an extreme DUI as a result of .16 or higher, a result of .05 or higher combined with any measurable controlled substance, or a case involving two or more non-prescribed controlled substances. What it raises is the jail minimum, not the class of the offense. The minimums in the table above are the figures for a case that is not charged as extreme; an extreme result raises the floor at every level. The look-back, and only the look-back, moves a case up the classification ladder. Both factors can apply to the same case, and both need to be reviewed against the actual test result and the actual prior record.
Challenging the Look-Back Calculation
The defense does not take the prosecution's list of priors at face value. Every prior the State intends to use gets independently verified, which means pulling the underlying records rather than working from a criminal history printout.
- Confirming the actual offense date and conviction date for each prior, since those are the statutory measuring points
- Verifying that the prior is a qualifying offense under Utah Code 41-6a-501(2), rather than an offense that merely looks like one
- Confirming the prior was constitutionally obtained
- Checking whether the prior has since been expunged, vacated, dismissed, or reduced, and what that does to its enhancement value
Constitutional challenges to a prior can decide the case. If a prior conviction was entered without the defendant being advised of the right to counsel, or without counsel being provided to an indigent defendant, that prior may be open to collateral attack. Knocking out a single prior removes it from the calculation and can drop the current charge an entire classification.
Our firm obtains the complete record for every prior the prosecution intends to use, analyzes the statutory basis and procedural history of each one, and identifies every available challenge. This is standard practice in every repeat-offense DUI case, not an extra step reserved for close calls.
Expungement, Records, and the Look-Back
Expungement and the look-back are related but separate questions. An expungement seals the record from public view. Whether an expunged conviction can still be used to enhance a later DUI charge is not settled in every circumstance, and it is an issue the defense should be prepared to litigate when it comes up rather than concede.
The waiting period for a DUI is also longer than the generic misdemeanor periods. Under Utah Code 77-40a-303, any misdemeanor conviction listed in Utah Code 41-6a-501(2) carries a ten-year waiting period. That covers a class B first offense, a class A second offense, and impaired driving alike, and the shorter generic misdemeanor waiting periods never apply to a DUI. The clock runs from the conviction or from release from incarceration, parole, or probation, whichever came last, and all fines, interest, and restitution have to be paid in full first. Whether a Utah DUI can be expunged at all is worth understanding before a case is resolved, not years afterward.
A felony DUI is categorically ineligible for expungement under Utah Code 77-40a-303(2)(a)(iv). There is no waiting period for it, because there is no path to it as a felony. That is not the end of the analysis: a reduction to a misdemeanor under Utah Code 76-3-402, or a pardon, can restore eligibility, which is one more reason a felony DUI and expungement should be evaluated on the specific record. Utah's automatic expungement law does not help either, because Utah Code 77-40a-205(3)(f)(vi) expressly excludes the entire DUI part of the code from clean slate treatment.
Planning Ahead: Today's Conviction Is Tomorrow's Prior
The look-back cuts forward as well as backward. A conviction entered today becomes a qualifying prior for the next ten years, and its reach is measured against the conviction date or offense date of any future charge, not against today's arrest date. That is a longer tail than the current case alone suggests when deciding how to resolve a first offense.
This is why how a case ends matters as much as whether jail is avoided. A dismissal, a reduction to a non-qualifying statute, and a conviction as charged produce very different exposure on anything that happens afterward. We walk through the look-back implications with every client, for the charge in front of them and for the window it opens going forward, so nobody is surprised later by a prior they believed had expired.
Utah DUI Look-Back Questions
How far back does Utah look for DUI priors?
Ten years. For the criminal charge, a prior conviction counts if it falls within ten years of the current conviction or the date the current offense was committed, under Utah Code 41-6a-502(2).
Is the ten years measured from arrest to arrest?
No, and this is a common misunderstanding about the look-back. The criminal enhancement statute measures from the prior conviction to the current conviction or the current offense date. Because a conviction is entered after the arrest, the reach is often longer than an arrest-to-arrest measure would suggest. The Driver License Division separately measures from the date of the prior violation under Utah Code 41-6a-509. Arrest dates are not a measuring point in either statute.
Do out-of-state DUI convictions count?
Yes, if the offense would be a violation of Utah's DUI law had it been committed in Utah. That requires comparing the out-of-state statute to Utah's, because not every impaired-driving conviction elsewhere qualifies.
Can a prior be removed from the look-back calculation?
Yes. A prior can be excluded if it was unconstitutionally obtained, for example if the person was not advised of the right to counsel or was not provided counsel while indigent, or if it simply does not qualify as a counting offense under Utah Code 41-6a-501(2).
Does a reduced charge count as a prior?
It depends on the statute of conviction. A plea to impaired driving under Utah Code 41-6a-502.5 counts as a qualifying prior. A plea to reckless driving under a non-DUI statute generally does not. A conviction later reduced under Utah Code 76-3-402 still counts.
Is there any DUI felony path that ignores the ten-year window?
Yes. Under Utah Code 41-6a-502(2)(c)(ii), a DUI conviction entered at any time after a prior felony conviction under that section, including one later reduced under Utah Code 76-3-402, is a third-degree felony regardless of how long ago that prior felony occurred.
Does an expunged DUI still count as a prior?
It is not settled in every circumstance. An expungement seals the record from public view, but whether the conviction can still be used for enhancement in a later DUI case is an issue that may have to be litigated on the specific facts.
Talk to Glen Neeley About a Repeat-Offense DUI
If you are facing a repeat-offense DUI, the look-back calculation may be the single most important issue in the case. Glen Neeley pulls the record behind every prior the prosecution intends to use and analyzes whether it actually qualifies under Utah Code 41-6a-501(2). Call for a free, confidential consultation.