---
title: "What is the Illinois lookback period for prior DUI convictions?"
description: "Illinois has no lookback period for DUI enhancement purposes. Every prior DUI conviction, regardless of age, counts as a prior under 625 ILCS 5/11-501. A DUI from 25 years ago carries the same..."
url: https://chicagoduilawyer.net/faq-items/what-is-the-illinois-lookback-period-for-prior-dui-convictions/
date: 2026-07-08
modified: 2026-07-08
author: "Chicago DUI Lawyer"
type: faq
lang: en
---

# What is the Illinois lookback period for prior DUI convictions?

Illinois has no lookback period for DUI enhancement purposes. Every prior DUI conviction, regardless of age, counts as a prior under 625 ILCS 5/11-501. A DUI from 25 years ago carries the same statutory weight as one from last year in triggering aggravated DUI on a third offense. The chicagoduilawyer.net brand flags this reality to every client with a prior record: unlike many other criminal offenses, DUI convictions do not fade with time. Prior court supervision on a first DUI does not count as a conviction, which is why front-end supervision preservation has decades-long strategic value. Every early decision echoes forward.