Reviewed and updated October 9, 2026 by the SearchSystems.net editorial team. The arrest counts are the ones each agency reported to the FBI, as the FBI held them on October 8, 2026. The jail figures are from the Vera Institute of Justice's Incarceration Trends data. Every office link was opened and checked against the office's own site between September 23, 2026 and September 25, 2026.
Longmont, Colorado, in Boulder County, has about 100,000 residents (2024 Census Bureau estimate). A DUI arrest in Longmont starts two cases, a criminal case in the County Court and a license case before the Division of Motor Vehicles, and leaves three records. This guide follows the arrest from the roadside to the court file and the driving record.
This guide covers the law, the arrest, booking, the court case, the license case, the records and common questions.
Related guides: Longmont public records, Boulder County DUI, Longmont arrest records, Longmont warrants, Longmont inmate search, Longmont criminal records, Colorado arrest records and Colorado inmate search.
The DUI Law in Colorado
In Colorado the offense is DUI, and the limit is 0.08; driving while ability impaired (DWAI) is charged from 0.05.
Driving in Colorado is consent to a breath or blood test when an officer has cause to suspect DUI; the license case that follows a refusal or a failed test is run by the Division of Motor Vehicles, separately from the criminal case.
Who Makes DUI Arrests in Longmont
The Boulder County Sheriff's Office and the agency that reports for Longmont (filed by the FBI as Longmont Police Department) make the DUI arrests in and around Longmont.
The FBI's agency list also places these agencies in Boulder County: Colorado Department of Revenue in Marijuana Enforcement Criminal Investigation, Boulder County (state agency); the University of Colorado at Boulder (campus police).
Together, the five agencies in Boulder County with all twelve months of 2025 on file reported 7,765 arrests to the FBI that year, all offenses together; the FBI's count for Boulder County does not break DUI out.
The Erie Police Department is listed by the FBI across two counties including Boulder County, so its arrests are not broken out for Boulder County here.
Booking After a DUI Arrest in Longmont
A driver arrested for DUI and kept in custody goes to the county jail, whichever agency made the arrest. The jail, run by the Boulder County Sheriff's Office, held about 320 people on an average day in 2025 by the Vera Institute of Justice's count and has a custody page SearchSystems verified at bouldercounty.gov/safety/jail/listing-and-booking-reports, phone 303-441-3600. The Longmont inmate search guide covers the jail in full.
The Court Case
A DUI charge from Longmont is brought by the District Attorney in the County Court.
The District Attorney's page SearchSystems verified is at bouldercounty.gov/district-attorney, phone 303-441-3700.
The court records page SearchSystems verified for the county is at coloradojudicial.gov/courts/trial-courts/boulder-county, phone (303)441-3750.
Colorado has no single public index of every trial court case; each court's records are looked up through that court.
The License Case
A DUI arrest starts two cases: the criminal one above and an administrative one over the license, run by the Division of Motor Vehicles. The driving record, kept by the Colorado Division of Motor Vehicles, carries the result of both.
The Records a DUI Leaves
- The arrest report: from the agency that made the arrest, under the Colorado Open Records Act.
- The court file: from the County Court, kept by the clerk of the combined court.
- The driving record: from the Colorado Division of Motor Vehicles.
More on each: Longmont arrest records, Longmont police reports and Longmont court records.
Frequently Asked Questions
What is the DUI limit in Colorado?
0.08 percent blood alcohol; driving while ability impaired (DWAI) is charged from 0.05.
Where is a DUI case from Longmont heard?
In the County Court, brought by the District Attorney. The court records page SearchSystems verified for the county is at coloradojudicial.gov.
Where is a person arrested for DUI in Longmont held?
At the county jail, run by the Boulder County Sheriff's Office, if kept in custody.
Who handles the license after a DUI arrest in Colorado?
The Division of Motor Vehicles, in an administrative case separate from the court case.
Is this the official Longmont website?
No. SearchSystems.net is an independent public records guide, online since 1997. It links to the official city, county, court and state offices described above and does not hold records, charge for them or take requests.