Third DUI in FloridaWhen Does It Become a Felony?

A third DUI is where a drunk driving case can cross a line that changes everything: from misdemeanor to felony. In Florida, whether that happens depends on timing, specifically how long ago your prior convictions occurred. Understanding the ten-year rule is the first step to knowing whether you are facing a felony and what that really means.

The Ten-Year Rule Is the Turning Point

In Florida, a third DUI does not automatically become a felony. The key is timing. If your third DUI occurs within ten years of a prior DUI conviction, it is charged as a third-degree felony. If the third DUI falls outside that ten-year window, it is generally still a misdemeanor, though with enhanced penalties. That single distinction, the date of the prior relative to the new offense, decides whether you are facing felony or misdemeanor exposure.

Because so much rides on those dates, the details of your prior record are not just background, they are central to the charge itself.

What a Felony DUI Means

A third DUI offense occurring within 10 years after a prior DUI conviction is a third-degree felony. A conviction carries at least 30 days of incarceration, including at least 48 consecutive hours; revocation of driving privileges for at least 10 years; vehicle immobilization or impoundment for 90 days, subject to statutory exceptions; and ignition-interlock installation for at least two years when the person becomes eligible to drive. A third-degree felony may carry up to five years in prison, but the actual sentence depends on the statutory requirements, Criminal Punishment Code scoresheet, prior record, and facts of the offense.

This is why a third DUI is a genuinely different case from a first or second. The exposure is no longer just about jail and your license; it is about becoming a convicted felon.

When the Fourth DUI Rule Also Matters

Florida also treats a fourth or subsequent DUI as a felony regardless of timing. So while the ten-year window governs whether a third DUI is a felony, the sheer number of prior offenses can independently push a case into felony territory. The interplay between the count of priors and their dates is exactly the kind of thing that has to be mapped out precisely in a repeat-DUI case.

Where the Defense Focuses

A felony DUI is serious, but it is not automatic. Several things are worth close examination. Are the prior convictions valid and properly documented? Do they actually fall within the ten-year window the state is relying on? Was the current stop lawful, and was the breath or field testing done correctly? Any of those can change whether the felony enhancement applies at all, or whether the underlying DUI stands. When the stakes include a felony record and years of exposure, those questions deserve serious attention. For comparison, our article on a second DUI within five years explains how the earlier tier of enhancements works. This article is general information about Florida law and is not advice about your specific case.