In most states, a DUI lookback period is ten years, meaning a prior conviction counts against you for sentencing purposes if a new arrest happens within a decade of the old one. The window is shorter in a few states (as little as five years) and unlimited in a growing number of others, where every past DUI counts forever. Where your state falls, and how it measures the time between offenses, determines whether a second arrest is treated as a first offense or as a repeat offense with substantially harsher penalties.
What the Lookback Period Decides
The lookback window draws a line between a one-time mistake and a pattern. If a new DUI falls inside it, prosecutors can seek the penalty tier reserved for repeat offenders: longer jail time, higher fines, longer license suspension, and in some cases a felony charge instead of a misdemeanor. If the old conviction falls outside the window, the new case is generally handled as a first offense. Some legislators call this a “washout” period because the earlier conviction eventually stops driving up sentences on new ones.
A washed-out conviction has not disappeared. It still sits on your permanent record and can still show up on a background check for employment or housing. The lookback rule only limits what a prosecutor can do with that old case in court on a new charge.
How the Clock Starts
States don’t all measure the window the same way, and if your dates are close to the edge, the measurement method can be the whole ball game. Three common approaches:
- Offense date to offense date. The clock starts on the day of the first offense and runs to the day of the new one. The simplest method, and the one that focuses on your conduct rather than the court’s calendar.
- Conviction date to new offense date. The clock starts when the court entered judgment on the first case. Because pleas and trials can take months, this tends to stretch the effective window slightly.
- Sentence completion to new offense date. The clock doesn’t start until you finish everything the court ordered: jail, probation, treatment. If your first sentence carried long probation, this method can push the lookback years further out.
A conviction that falls just outside a ten-year window under one method can sit squarely inside it under another. If your dates are near the boundary, the measurement rule your state uses can be the difference between a misdemeanor and a felony.
How Long the Window Is by State
There is no national standard, and the recent trend has been toward longer windows.
Five-Year Windows
A handful of states use a five-year lookback, the shortest in the country. Sixty months of clean driving after a conviction essentially resets a driver to first-offender status for sentencing purposes.
Seven- and Ten-Year Windows
Ten years is the most common standard, used by a majority of states. A smaller group uses seven years. Most practical guidance and case law about how lookback calculations work comes out of ten-year states, simply because they are the majority.
Lifetime Lookback
A growing number of states have eliminated the washout entirely. Every prior DUI counts, no matter how old. A conviction from twenty or thirty years ago triggers the same enhancement as one from last year, and once you have been convicted in one of these states, you cannot return to first-offender status.
What Still Counts as a Prior
People often assume that if they pleaded their original DUI down, sealed the record, or completed a diversion program, the old case will not follow them. That assumption is frequently wrong.
Reduced Charges
Many states treat a “wet reckless” plea (reckless driving involving alcohol) or a similar reduced charge as a prior DUI for lookback purposes. The reasoning: the underlying conduct was impaired driving, and the reduction was a prosecutor’s concession, not a finding that you were sober. If the plea grew out of an original DUI filing, expect most states to count it.
Expunged Convictions
Expungement or record sealing generally does not remove a conviction from the lookback calculation. An expunged DUI still counts as a prior for enhancement purposes in most states. Expungement helps with background checks; it typically offers no protection at sentencing if you are arrested again.
Deferred Sentences and Diversion Programs
Treatment varies widely. Some states count a deferred adjudication or pre-trial diversion as a prior even though no formal conviction was entered; others don’t. If you completed a diversion program years ago and are now facing a new charge, bring that paperwork to your attorney.
Out-of-State Priors
Moving to a new state does not reset your DUI history. Nearly every state participates in the Driver License Compact, an interstate agreement that shares information about traffic violations and license suspensions among member jurisdictions.1The Council of State Governments. Driver License Compact The compact covers 46 states plus the District of Columbia, and a participating state treats an out-of-state offense as if it happened locally.2American Association of Motor Vehicle Administrators. Driver License Compact
A newer agreement, the Driver License Agreement, is gradually replacing the older compact. It requires member jurisdictions to report convictions and administrative actions within 30 days and broadens the definition of “conviction” to include guilty pleas, no-contest pleas, bail forfeitures, and default judgments.3The Council of State Governments. Driver License Agreement
Before an out-of-state conviction can enhance your sentence, the court in your home state asks whether the out-of-state offense is “substantially similar” to a local DUI statute. If the elements match, it counts. In practice, every state prohibits the same core conduct, and most out-of-state DUIs are treated as priors.
Your License Has Its Own Lookback
A DUI triggers two separate proceedings. The criminal case decides jail time, fines, and whether the charge is a misdemeanor or felony. The administrative case, run by the DMV or equivalent agency, decides what happens to your license. These two systems often use different lookback windows.
Your state’s criminal lookback might be ten years while the administrative lookback for license suspension is shorter or longer. The administrative process is civil and runs on its own timeline. An acquittal on the criminal charge does not automatically reverse an administrative suspension. It is possible to be treated as a first offender for sentencing (because the prior fell outside the criminal window) and still face an enhanced license suspension under the administrative window.
Commercial Driver’s Licenses Are Different
If you hold a CDL, the rules above do not really apply to you. Federal regulations disqualify a CDL holder from operating a commercial vehicle for at least one year after a single major offense, which includes driving under the influence, having a blood alcohol concentration of 0.04 or higher in a commercial vehicle, or refusing a chemical test.4eCFR. 49 CFR 383.51 – Disqualification of Drivers
A second major offense results in a lifetime disqualification. There is no washout. A state may reinstate a lifetime-disqualified driver after ten years if the driver completes an approved rehabilitation program, but that reinstatement is a one-time opportunity, and a third offense after reinstatement is permanent with no further chance.5eCFR. 49 CFR Part 383 Subpart D – Driver Disqualifications and Penalties Drivers convicted of using a commercial vehicle in a drug trafficking or human trafficking felony face a permanent lifetime ban with no reinstatement at all.4eCFR. 49 CFR 383.51 – Disqualification of Drivers
What a Prior Inside the Window Actually Costs
The practical gap between “inside the window” and “outside the window” is large. A second DUI processed as a first offense may mean a fine, a short suspension, and probation. The same arrest treated as a repeat offense can mean mandatory jail a judge cannot waive, fines in the thousands, and a suspension measured in years.
Ignition interlock devices are standard for repeat offenders, and under federal minimum standards the device stays on your vehicle for at least a year.6NHTSA. Alcohol Ignition Interlocks You pay for installation, monthly monitoring, and removal.
The biggest jump is felony reclassification. In most states, enough prior DUIs within the lookback window upgrade a new charge from misdemeanor to felony, most commonly on a third or fourth offense. A felony DUI carries consequences that reach past the courtroom: federal law prohibits anyone convicted of a crime punishable by more than one year of imprisonment from possessing a firearm.7Office of the Law Revision Counsel. 18 USC 922 – Unlawful Acts A felony record also creates lasting barriers to employment, professional licensing, housing, and, in some states, voting.
Reinstatement after an enhanced suspension is its own expense. DMV processing fees run from roughly $25 to $500 depending on the state, but that is just the counter fee. Court fines, mandatory alcohol education, SR-22 high-risk insurance filings, and the interlock costs push the total out-of-pocket for a repeat offender into the thousands. If you are near the edge of your state’s lookback window and unsure how the dates fall, an attorney who handles DUI cases in your jurisdiction can tell you which measurement method applies and where you actually stand.