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A DUI in Idaho is not automatically a felony. Most first and second DUI offenses are charged as misdemeanors under Idaho law. However, certain circumstances, including a third offense within ten years or a DUI that causes serious injury to another person, can elevate the charge to a felony with significantly harsher consequences. Understanding where your case falls on that spectrum is critical for how you approach your defense.
Martens Law Office defends individuals facing DUI charges throughout Boise and the surrounding Idaho communities. Call us at (208) 344-0994 today to discuss your case.
Idaho law classifies DUI offenses based on the number of prior convictions within a ten-year period and the circumstances of the current offense. A standard DUI involves operating a vehicle with a blood alcohol concentration of 0.08% or higher, or while impaired by alcohol, drugs, or a combination of both. The classification of the offense, misdemeanor or felony, depends on the driver’s prior record and what happened during the incident.
Idaho also recognizes two elevated categories beyond standard DUI:
These categories carry their own enhanced penalties.
In Idaho, a DUI is generally a misdemeanor when it is a first or second offense within the applicable lookback period and the case does not involve aggravating circumstances that elevate it to a felony. A misdemeanor DUI still carries serious penalties, including jail time, fines, driver’s license consequences, and a criminal record.
A DUI becomes a felony in Idaho when it is a third or subsequent offense within ten years, or when it involves causing great bodily harm to another person. These are treated as fundamentally more serious offenses by Idaho courts, and the penalties reflect that.
An aggravated DUI in Idaho occurs when a person causes an accident while driving under the influence that results in great bodily harm, permanent disability, or permanent disfigurement to another person. Critically, aggravated DUI is charged as a felony regardless of whether the driver has any prior DUI convictions. A first-time DUI offender who causes serious injury to another person faces felony charges immediately, without the need for prior offenses to elevate the charge.
Idaho uses a ten-year lookback period to determine how prior DUI convictions affect the classification of a current charge. When evaluating a new DUI arrest, courts generally look at whether prior DUI convictions occurred within ten years of the current offense
Here is a straightforward example. Suppose a driver was convicted of their first DUI in January 2015 and their second DUI in March 2022. If they are arrested for a third DUI in June 2025, both prior convictions fall within the ten-year window, making the current offense a felony. If the first conviction had occurred in January 2013, it would fall outside the lookback period and would not count, potentially keeping the current charge at the misdemeanor level.
This ten-year calculation is one of the most important factors in determining what you are facing, and it is also one of the areas where a careful legal review can sometimes identify arguments that affect how prior convictions are counted.
A first DUI offense in Idaho is a misdemeanor, carrying up to six months in jail, fines up to $1,000, and a 90-day to 180-day license suspension.
A second DUI within ten years is also a misdemeanor but carries enhanced penalties including up to one year in jail, fines up to $2,000, and a one-year to two-year license suspension.
A third DUI conviction within ten years is a felony in Idaho carrying up to ten years in prison, fines up to $5,000, a mandatory license suspension of one to five years, and includes mandatory minimum incarceration before eligibility for probation or parole.
A felony DUI conviction can result in a permanent criminal record that may affect employment, housing, firearm rights, and civic participation long-term. Ignition interlock device requirements often apply as a condition of restoring driving privileges.
The contrast between misdemeanor and felony DUI penalties in Idaho is significant. A first or second offense may involve shorter jail sentences and lower fines compared to felony charges. A felony conviction can mean years of incarceration and consequences that follow a person indefinitely.
Aggravated DUI carries even more severe consequences than a standard felony DUI. A conviction can result in up to fifteen years in prison, substantially higher fines, mandatory license suspension, and restitution payments to the victims who were seriously injured. The combination of potential prison time and victim restitution makes an aggravated DUI one of the most serious criminal charges a driver in Idaho can face.
Several factors can increase the severity of a DUI charge or its consequences beyond the baseline classification:
DUI situations can escalate quickly, and what begins as a routine traffic stop can become a felony matter depending on a BAC reading or whether another person was hurt.
The actions you take in the period immediately following a DUI arrest affect your options and your defense. The most important steps are:
Early involvement allows an attorney to identify defenses and preserve evidence before they become unavailable
Whether you are facing a first-time misdemeanor DUI or a felony charge based on prior convictions or serious injury, the outcome of your case depends significantly on how it is defended from the start. At Martens Law Office, we provide clients throughout Boise and Idaho with sound advice, powerful counsel, and the kind of direct personal attention that only a dedicated solo practitioner can offer.
Our criminal defense attorneys can listen to your goals, explain your legal options honestly, and craft a defense strategy built around your specific situation and the outcomes you are hoping to achieve.
Contact Martens Law Office (208) 344-0994 today to discuss what you are facing and how our experienced DUI defense attorneys can defend you in court.
