Most Idaho DUI charges begin as misdemeanors. A DUI does not become a felony merely because the arrest happened in Boise, the reported alcohol concentration was high, or the driver has one ordinary prior DUI. Idaho law provides several specific paths to a felony charge, and each path has different elements, lookback rules, and possible penalties.
The first step in a felony DUI case is to identify the exact statute the prosecution is using. The defense should then examine both the current allegation and every prior conviction, withheld judgment, diversion, or out-of-state case the state relies on. A label in a driving record is not a substitute for that analysis.
When Can an Idaho DUI Be Charged as a Felony?
The most common felony paths are summarized below. This is not a universal rule that every old DUI counts. The dates, disposition, statute, alcohol concentration, and jurisdiction can change the result.
| Felony path | What Idaho law generally requires | Relevant period |
|---|---|---|
| Repeat DUI under Idaho Code section 18-8005(6) | A new DUI after two or more qualifying prior DUI guilty pleas or findings of guilt, or a qualifying DUI diversion plus at least one qualifying prior guilty plea or finding | 10 years, subject to the statute’s timing rules |
| New DUI after a qualifying prior felony under section 18-8005(9) | A prior felony DUI, felony excessive DUI, aggravated DUI, DUI-based vehicular manslaughter, or substantially conforming foreign felony followed by another DUI | 15 years, subject to the statute’s timing rules |
| Repeat excessive DUI under section 18-8004C | A current police-requested test result of 0.20 or higher and a qualifying prior case that also involved an alcohol concentration of 0.20 or higher | 5 years |
| Aggravated DUI under section 18-8006 | Driving under the influence that causes great bodily harm, permanent disability, or permanent disfigurement | No prior DUI is required |
| DUI-based vehicular manslaughter under section 18-4006(3)(b) | Operation of a vehicle is a significant cause contributing to a death because of a DUI or aggravated DUI violation | No prior DUI is required, but qualifying priors can change the sentencing tier |
Two or more qualifying prior DUIs within 10 years
Idaho Code section 18-8005(6) applies when a person charged with a new DUI has two or more qualifying prior DUI guilty pleas or findings of guilt within the statutory period. It also contains a separate route involving completion of a DUI diversion program plus at least one qualifying prior guilty plea or finding within 10 years.
This is why the shorthand phrase “third DUI in 10 years” is useful but incomplete. The statute addresses diversions, withheld judgments, substantially conforming foreign offenses, and how time is calculated while a case is pending. The actual court records should be reviewed before accepting the prosecution’s count.
A new DUI within 15 years of a qualifying felony
Section 18-8005(9) creates another felony path when the prior case was a qualifying felony DUI, felony excessive DUI, aggravated DUI, DUI-based vehicular manslaughter, or a substantially conforming foreign felony. If a person then pleads guilty to or is found guilty of another DUI within 15 years, the new case is a felony sentenced under section 18-8005(6).
The 15-year rule is not a general rule for every misdemeanor DUI. It applies to the qualifying prior felonies and offenses identified in subsection (9).
A repeat excessive DUI within five years
An alcohol concentration of 0.20 or higher does not automatically make a first excessive DUI a felony. A first excessive DUI is a misdemeanor under Idaho Code section 18-8004C. The felony provision generally requires a current result of 0.20 or higher and a qualifying prior case within five years in which the alcohol concentration was also 0.20 or higher. Read the separate guide to excessive DUI in Idaho.
Serious injury or death
A DUI can be a felony without any prior record when the alleged driving causes the type of serious injury covered by Idaho’s aggravated DUI law. A death can support the separate offense of DUI-based vehicular manslaughter when the state can prove the required causal connection. Those offenses have different elements and penalties from a repeat felony DUI and should not be grouped together as though they were the same charge.
Is a Second DUI in Idaho a Felony?
Usually not. One ordinary prior DUI within 10 years generally makes the new charge a second-offense misdemeanor under Idaho Code section 18-8005(4). Important exceptions include a qualifying prior felony, the repeat excessive-DUI rule, or a new event involving serious injury or death. Our Idaho second-offense DUI guide explains the ordinary misdemeanor rule and its penalties.
Which Prior Cases Can Count?
A felony enhancement should be supported by the records, not assumed from a database summary. Counsel should obtain the complaint or citation, judgment, plea record, test information when relevant, and any diversion documentation. The review may include:
- The exact disposition: Idaho’s enhancement statutes can count qualifying guilty pleas and findings of guilt even when the judgment was withheld. A withheld judgment should not simply be treated as though the case never existed.
- Diversion: Completion of a DUI diversion program can matter under the specific diversion language in section 18-8005(6).
- Out-of-state cases: A foreign offense does not count merely because another state called it a DUI. For the relevant enhancement provisions, the foreign criminal violation must substantially conform to Idaho law, and substantial conformity is a legal question for the court.
- The correct lookback: Different felony paths use five-, 10-, or 15-year periods. Section 18-8005 also excludes certain time between the commission and resolution of a pending offense when calculating its enhancement periods.
- The alcohol concentration: For a felony excessive-DUI allegation, the state must establish the qualifying 0.20-or-higher facts for the current and prior cases required by section 18-8004C.
A prior-record issue can affect whether the case is a felony even when it does not defeat the new DUI allegation itself.
Penalties for a Repeat Felony DUI
For a felony sentenced under Idaho Code section 18-8005(6), the statute authorizes:
- up to 10 years in the custody of the Idaho State Board of Correction;
- a fine of up to $5,000;
- if the court imposes a sentence other than incarceration in the state penitentiary, at least 30 days in county jail, with statutory rules governing how part of that time is served;
- a court-ordered license suspension for at least one year after release from imprisonment, with no driving privileges during that mandatory year, and a possible additional suspension of up to four years; and
- an ignition interlock requirement when driving after the mandatory one-year suspension.
Felony excessive DUI, aggravated DUI, and vehicular manslaughter carry different sentencing provisions. The charge listed in the complaint matters. See the broader guide to Idaho DUI penalties rather than applying the repeat-felony maximum to every felony case.
A Felony Conviction Can Have Long-Term Consequences
A felony DUI conviction can affect liberty, driving, employment, professional licensing, firearm rights, housing, insurance, and immigration, depending on the person’s circumstances and the law that applies. Those consequences can last long after the criminal sentence ends.
It is accurate to call those consequences serious and potentially long-lasting, but it is not accurate to say the record can never change in any case. Whether a conviction may later be reduced, dismissed, set aside, sealed, or otherwise addressed is a separate, fact-specific question. It should not be promised at the beginning of a case.
How a Felony DUI Defense Is Evaluated
A felony DUI defense has at least two layers: the evidence supporting the new DUI and the evidence supporting felony treatment.
Review the current DUI allegation
The defense may examine the reason for the stop, who was driving or in actual physical control, statements, video, field sobriety testing, chemical-test foundation, toxicology, medical information, and the timing of the evidence. The relevant issues differ in alcohol, drug, breath, and blood cases. Start with the overview of fighting an Idaho DUI charge, then review the focused guides to breath-test evidence, blood-test evidence, and drug DUI.
Audit the claimed enhancement
The prosecution should be required to establish the prior cases and other facts needed for the particular felony provision. That can involve identity, certified records, dates, the form of the prior charge and disposition, diversion records, the prior alcohol concentration, and whether a foreign law substantially conforms to Idaho law.
Prepare for the criminal and license proceedings
The criminal case and a driver’s-license proceeding may move on separate tracks. Time-sensitive administrative issues should not be ignored while the felony case is being investigated. The Ada County DUI court-process guide explains the usual stages from arraignment through motions, negotiation, trial, and sentencing.
Questions About a Felony DUI in Boise?
Felony classification can turn on details that do not appear in a short online case summary. Gather the current citation or complaint, prior judgments, diversion paperwork, license notices, and any chemical-test records you have. Attorneys of Idaho can review the alleged DUI and the state’s claimed felony basis, explain the next deadlines, and discuss available options without promising a particular result.
Contact Attorneys of Idaho to request a confidential consultation, or visit the Idaho DUI Help Center for related guides.
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Reviewed by J.W. Bond , Founding Attorney and Partner.