Idaho DUI Penalties in Ada County: What to Expect (1st, 2nd, Excessive, Felony & Aggravated)

Navigating the winding roads of Idaho's DUI laws? Buckle up—here's your local, Boise‑focused guide to how DUI penalties actually play out in Ada County and what you can do right now to protect your license and your case. We'll keep the tone approachable, but the information is straight from Idaho law and what we see daily in the Fourth Judicial District (Ada County Courthouse, downtown Boise).

Quick Boise Snapshot (At‑a‑Glance)

• 1st Offense DUI (standard): Up to 6 months jail, up to $1,000 fine, license suspension 90–180 days (first 30 days absolute), ignition interlock for 1 year after suspension, alcohol evaluation, possible treatment, probation.

• 2nd Offense DUI (within 10 years): Mandatory 10 days to 1 year jail (first 48 hours consecutive), up to $2,000 fine, 1‑year absolute license suspension after release, then interlock, evaluation/treatment, probation.

• Excessive DUI (BAC ≥ 0.20): Mandatory 10 days jail (up to 1 year), up to $2,000 fine, 1‑year absolute suspension after release. A second “Excessive” within 5 years is a felony.

• Felony DUI (e.g., 3rd DUI within 10 years or certain priors): Up to 10 years prison, up to $5,000 fine, 1–5 years suspension after release, interlock.

• Aggravated DUI (serious injury): Felony, up to 15 years prison, up to $5,000 fine, 1–5 years suspension after release, restitution, interlock.

• Administrative License Suspension (ALS) for test failure: 90 days (first 30 absolute) on a first fail; 1 year on a second fail within 5 years.

• Implied Consent (refusal): 1‑year revocation for first refusal; 2 years for second refusal within 10 years; interlock required afterward.

Local tip: Ada County DUI cases are heard at the Ada County Courthouse (Fourth Judicial District) in downtown Boise. Depending on where the stop happened, your case may be prosecuted by the Ada County Prosecutor or the Boise City Attorney (Boise and Meridian misdemeanors are typically handled by the City).

Penalty Chart — Ada County, Idaho (Quick Reference)

This chart summarizes typical statutory ranges and common local practices. Your exact outcome depends on your facts, history, and forum.

Charge Level (Ada County)	Jail (Min–Max)	Fine (Max)	Court‑Ordered License Suspension	Ignition Interlock	Local Notes
1st Offense DUI (standard)	0–6 months	$1,000	90–180 days; first 30 days absolute	1 year after suspension	Evaluation/treatment; possible restricted privileges after day 30 at judge's discretion; probation
2nd Offense DUI (≤10 years)	10 days–1 year (first 48 hrs consecutive)	$2,000	1‑year absolute after release (no privileges)	Required after suspension	Strict minimums; expect tighter probation
Excessive DUI (BAC ≥ 0.20)	10 days–1 year (first 48 hrs consecutive)	$2,000	1‑year absolute after release (no privileges)	Required after suspension	Second “Excessive” within 5 years is a felony
Felony DUI (e.g., 3rd within 10 years; or 2nd “Excessive” within 5)	At least 30 days jail if no prison (first 48 hrs consecutive; ≥10 days served) to up to 10 years prison	$5,000	1–5 years after release; first year absolute	Required after suspension	Sentencing in district court; priors and BAC level matter
Aggravated DUI (serious injury)	Up to 15 years prison	$5,000	1–5 years after release; first year absolute	Required after suspension	Restitution to injured victim(s) likely

Administrative License Consequences (Separate from Court)

Scenario	Length	Restricted Privileges?	Interlock Afterward?	Key Deadline
Test Failure — 1st within 5 years	90 days (first 30 absolute)	Eligible after day 30	Typically 1 year	Request ALS hearing within ~7 days
Test Failure — 2nd within 5 years	1 year	No	Typically 1 year	Request ALS hearing within ~7 days
Evidentiary Test Refusal — 1st	1 year (revocation)	No	Typically 1 year	Request hearing within ~7 days
Evidentiary Test Refusal — 2nd (within 10 years)	2 years (revocation)	No	Typically 1 year	Request hearing within ~7 days

How the Law Defines DUI in Idaho (and Why “0.08%” Isn't the Only Way)

Idaho law prohibits driving or being in actual physical control of a vehicle while under the influence of alcohol, drugs, or any intoxicating substances. There are two common paths to a DUI conviction:

1. Per se: Your breath/blood alcohol concentration is 0.08% or higher (lower for commercial drivers; different rule for drivers under 21).

2. Impairment: You're impaired by alcohol and/or drugs to the degree that it affects your ability to drive safely—even if you're under 0.08.

“Actual physical control” is broader than just driving. If you're in the driver's seat with the engine running, you can be charged. This matters in Boise winters when people “sleep it off” in a running car.

Penalties by Charge Level (Ada County Focus)

🚗 1st Offense DUI — “The Rookie Mistake”

• Jail: Up to 6 months (most first‑timers receive unsupervised probation with conditions rather than lengthy jail time, but each case is unique).

• Fines: Up to $1,000 plus court costs.

• License: Court‑ordered suspension 90–180 days. The first 30 days are absolute (no driving). After that, the judge may allow restricted privileges for work/medical/family needs.

• Ignition Interlock: Required for 1 year after your suspension ends. You must arrange installation on any car you operate.

• Alcohol Evaluation & Treatment: You'll complete a court‑approved alcohol evaluation. If treatment is recommended, the court orders it.

• Probation Terms in Ada County: Expect standard terms like no alcohol violations, random testing, compliance with evaluation/treatment, potential community service, and proof of interlock. Since first time is generally unsupervised, this is the Court asking you to make them a promise rather than following up and making you prove that you're not drinking.

Local process: Your first court appearance (arraignment) will be at the Ada County Courthouse. If your stop was inside Boise city limits, a Boise City Attorney typically prosecutes; outside city limits (Eagle, Star, Kuna, unincorporated Ada), the Ada County Prosecutor typically handles it.

🚓 2nd Offense DUI — “The Sequel Nobody Asked For” (within 10 years)

• Jail: Mandatory minimum 10 days, up to 1 year. The first 48 hours must be consecutive; at least 5 days must be served in jail.

• Fines: Up to $2,000 plus costs.

• License: 1‑year absolute suspension after release from custody. No driving privileges of any kind during that year.

• Ignition Interlock: Required after the suspension runs its course.

• Alcohol Evaluation & Treatment: Required; courts take compliance seriously on repeat DUIs.

Local note: Ada County judges strictly enforce jail minimums; good mitigation (treatment engagement, stable employment, no new violations) can influence how remaining time is structured.

🍺 Excessive DUI — “The Overachiever” (BAC ≥ 0.20)

• Charge level: First “Excessive” is a misdemeanor.

• Jail: Mandatory 10 days (first 48 hours consecutive), up to 1 year.

• Fines: Up to $2,000.

• License: 1‑year absolute suspension after release from jail (no privileges at all during that year).

• Second “Excessive” within 5 years: Felony exposure—see below.

Boise reality check: Prosecutors and judges treat “Excessive” as a red flag for risk—expect tighter probation, more treatment, and zero tolerance for violations.

🏛 Felony DUI — “The Big League”

A DUI becomes a felony if you have two prior DUI convictions within the last 10 years (including certain out‑of‑state convictions and diversions), or if you pick up a second “Excessive” within 5 years, among other combinations.

• Prison/Jail: Up to 10 years in the custody of the Idaho Board of Correction. If prison is not imposed, the court must impose at least 30 days in jail (first 48 hours consecutive; at least 10 days served in jail).

• Fines: Up to $5,000.

• License: 1–5 years suspension after release from imprisonment; the first year is absolute.

• Ignition Interlock: Required after the suspension period.

Local defense insight: Early, documented treatment and a clean supervision record can matter significantly in Ada County felony sentencing.

🚨 Aggravated DUI — “The Blockbuster”

If a DUI causes great bodily harm, permanent disability, or permanent disfigurement to someone else, it's Aggravated DUI, always a felony.

• Prison: Up to 15 years.

• Fines: Up to $5,000.

• License: 1–5 years after release from imprisonment, with an absolute first year of no driving.

• Restitution: Courts order restitution to injured victims.

• Ignition Interlock: Required after suspension.

Boise reality: These cases draw intensive scrutiny. Thorough accident reconstruction, medical causation analysis, and suppression issues are often front‑and‑center in the defense.

Two Tracks That Start Immediately: Criminal Case vs. Your License (ALS/Refusal)

1) The Criminal Case (at the Ada County Courthouse): This is where jail, fines, probation, treatment, and court‑ordered suspension/interlock are decided. Deadlines come fast—get counsel on board early.

2) Your Driver's License (Idaho Transportation Department): Separate from the court, the Administrative License Suspension (ALS) kicks in if you fail evidentiary testing, and the implied consent revocation kicks in if you refuse testing.

• Failed test (ALS): First failure = 90‑day suspension (first 30 days absolute, then you may apply for restricted privileges). Second failure within 5 years = 1‑year suspension (no restricted privileges).

• Refusal: First refusal = 1‑year revocation. Second refusal within 10 years = 2‑year revocation. No restricted privileges during these periods.

• Interlock: After an ALS or refusal suspension, expect a 1‑year ignition interlock requirement on any vehicle you operate.

• Deadline: You generally have 7 days from service of the notice to request an ALS hearing. Miss it, and the suspension goes into effect automatically 30 days after the notice.

Why this matters in Boise: People often focus on the criminal case and miss the ALS deadline. We file these challenges routinely for Ada County clients. Winning the ALS hearing can keep you driving while your court case proceeds.

Who Prosecutes My Case in Ada County?

• Inside Boise or Meridian city limits: Typically the Boise City Attorney prosecutes misdemeanors (including standard DUI cases arising within city limits).

• Outside city limits (Eagle, Star, Kuna, Garden City, unincorporated Ada): The Ada County Prosecutor typically handles the case.

• Felony DUIs: Prosecuted by the Ada County Prosecutor.

All hearings occur at the Ada County Courthouse, 200 W. Front St., Boise. Plan for weekday appearances; the court runs on Mountain Time.

Common Ada County Probation & Compliance Items

• Alcohol/Drug Evaluation (and treatment if recommended)

• Ignition Interlock installation and proof of compliance

• Random testing and no‑alcohol condition

• No new law violations

• Community service or other programming the court orders

Failing to comply triggers probation violations that can quickly land you back in custody. If you're struggling with any condition, communicate early through counsel—Ada County judges expect proactive problem‑solving.

What to Do Next

1. Call a Boise DUI lawyer immediately. Short deadlines (especially the 7‑day ALS window) can make or break your ability to drive.

2. Write down what happened: The driving, the stop, what the officer said, field tests given, any medical issues, and the testing process.

3. Get to an evaluation early if appropriate. Showing you're engaged in treatment can help in negotiations and sentencing.

4. Plan for interlock. If a conviction or ALS is likely, line up a certified vendor so you're ready.

5. Keep life stable: Work, classes, counseling—judges in Ada County weigh stability and accountability.

Need Boise‑Local Help?

We represent clients every day in Boise, Meridian, Eagle, Kuna, Star, and Garden City. Our goals are simple: protect your license, reduce or avoid jail, and build a treatment‑forward plan that works in Ada County courts. Call 208‑392‑1964 to talk with an Ada County DUI attorney today.