California DUI Penalties: 1st, 2nd, 3rd & Felony DUI

Q: How does California count prior DUIs?

California uses a rolling 10-year lookback measured (generally) from offense dates. Prior DUI convictions, qualifying "wet reckless" pleas, and equivalent out-of-state convictions inside that window can count as priors and trigger higher mandatory minimums (DRAFT — verify).

Reviewed by Ron Chini, Esq. · CA State Bar No. 263308 · DUI defense attorney in Irvine, CA since 2009.
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In California, a DUI conviction carries a stacked set of penalties — fines and court fees, probation, a mandatory DUI program, possible jail, a license suspension, and often an ignition interlock device (IID). How severe those penalties get depends heavily on your priors within a 10-year lookback window: a first offense is treated very differently from a second or third, and certain DUIs become felonies. This DRAFT page explains how the penalties escalate so you know what's at stake — and where a defense can change the outcome. For the related license fight, see the DMV hearing page.

The 10-year lookback: why priors matter so much

California counts your DUI history over a rolling 10-year period. A prior DUI conviction — and generally a "wet reckless" plea, and qualifying out-of-state convictions — counts as a prior if it falls within those 10 years (DRAFT — verify). The more priors inside that window, the higher the mandatory minimum penalties climb: longer jail floors, longer license suspensions, longer DUI school, and a longer IID requirement. Once a prior ages past 10 years, it generally stops triggering those repeat-offense minimums (DRAFT — verify).

All of the penalty ranges below come from California's Vehicle Code (VC 23536, 23540, 23546, 23550) and assume a standard alcohol DUI under VC 23152. Actual sentences vary by county, the facts of the case, your BAC, and whether anyone was injured. Every figure here is DRAFT and must be confirmed against the current code.

First DUI (VC 23536) — misdemeanor

A first-time DUI with no injury is a misdemeanor. Typical penalties under VC 23536 (DRAFT — verify):

Fine: generally $390 to $1,000 base, but court assessments and penalty surcharges typically push the real total to roughly $1,800–$3,600+ (DRAFT — verify)
Probation: typically 3 to 5 years of informal (summary) probation (DRAFT — verify)
DUI school: a 3-month program (about 30 hours); a 9-month program is generally required if your BAC was 0.20% or higher or you refused testing (DRAFT — verify)
Jail: up to 6 months is possible, though first offenders frequently serve little or no jail when probation is granted (DRAFT — verify)
License suspension: a court-triggered suspension of around 6 months, separate from any DMV action (DRAFT — verify)
IID: a first-time, non-injury offender may generally choose to install an ignition interlock device for about 6 months to keep driving (DRAFT — verify)

Second DUI (VC 23540) — within 10 years

A second DUI within 10 years of a prior is still a misdemeanor, but the minimums jump. Under VC 23540 (DRAFT — verify):

Fine: base fine generally $390 to $1,000, again far higher after assessments (DRAFT — verify)
Jail: typically a mandatory minimum in the range of 96 hours up to 1 year (DRAFT — verify)
Probation: typically 3 to 5 years informal probation (DRAFT — verify)
DUI school: commonly an 18-month or 30-month program (DRAFT — verify)
License suspension: often around 2 years (with possible IID-restricted driving) (DRAFT — verify)
IID: generally required, commonly about 1 year (DRAFT — verify)

Third DUI (VC 23546) — within 10 years

A third DUI within 10 years carries longer mandatory jail and a longer license action. Under VC 23546 (DRAFT — verify):

Jail: a mandatory minimum often cited around 120 days, up to 1 year (DRAFT — verify)
Fine: base $390 to $1,000, higher in practice (DRAFT — verify)
DUI school: typically the 30-month program (DRAFT — verify)
License suspension: often around 3 years (DRAFT — verify)
IID: generally about 2 years (DRAFT — verify)
A third-time offender may also be designated a Habitual Traffic Offender by the DMV (DRAFT — verify)

When a DUI becomes a felony

Most DUIs are misdemeanors, but two situations commonly raise a DUI to a felony in California:

A 4th DUI within 10 years (VC 23550). A fourth alcohol DUI inside the 10-year window can be charged as a felony. Penalties generally include 16 months, 2 years, or 3 years of incarceration, a 30-month DUI program, and a license revocation in the range of about 4 years (DRAFT — verify).
A DUI causing injury (VC 23153). If you injure another person while driving under the influence, the charge can be filed as a misdemeanor or a felony (a "wobbler"). As a felony, exposure typically includes a state prison term (often cited as 16 months, 2, or 3 years, and substantially more with serious injuries, multiple victims, or enhancements), plus restitution, DUI school, and a long license revocation (DRAFT — verify).

A prior felony DUI within 10 years can also make a new DUI chargeable as a felony (DRAFT — verify). Felony DUI carries the added weight of a permanent felony record, which is why the charging decision is one of the most important things to fight early.

Penalty ranges are not the whole story

The numbers above are statutory exposure, not a prediction of your sentence. Whether a charge is reduced, whether a prior counts, whether the stop and the breath or blood test hold up, and how your county handles DUIs all change the result. There are no guarantees, but the outcome is often very different from the worst-case figures.

How does California count prior DUIs?

California uses a rolling 10-year lookback measured (generally) from offense dates. Prior DUI convictions, qualifying "wet reckless" pleas, and equivalent out-of-state convictions inside that window can count as priors and trigger higher mandatory minimums (DRAFT — verify).

Will I definitely go to jail for a first DUI?

Not necessarily. A first non-injury DUI carries up to 6 months of possible jail, but first offenders granted probation frequently serve little or no jail time depending on the county and the facts (DRAFT — verify). This is general information, not a promise about your case.

How long is DUI school?

It depends on the offense and your BAC. First offenses are commonly a 3-month program (or 9 months for a high BAC or refusal); repeat and more serious offenses commonly run 18 or 30 months (DRAFT — verify).

Do I have to install an ignition interlock device (IID)?

Often, yes. A first-time, non-injury offender can generally choose a roughly 6-month IID to keep driving, and IID requirements grow with priors (about 1 year for a second, 2 years for a third, and longer for a fourth or injury DUI) (DRAFT — verify).

Can these penalties be reduced?

Sometimes. Charges can potentially be reduced or dismissed, priors can be challenged, and sentencing terms negotiated — but every case is different and nothing is guaranteed. The best step is a free consultation to review the specific facts. Ron Chini handles DUI defense in English and Farsi.

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Ron Chini, Esq.

DUI Defense Attorney · CA State Bar No. 263308

Ron has focused on DUI and criminal defense from his Irvine office since 2009. You work directly with him — not a paralegal or a call center.

Learn more about Ron Chini →

California DUI Penalties: 1st, 2nd, 3rd, and Felony DUI

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