If you are trying to figure out when someone gets out of prison in Colorado, the honest answer is that it depends on two dates the state calculates and how the parole board uses the window between them. A release date is not one fixed number. It is a calculation that moves as earned time, discipline, and program completion change. Here is how that calculation works in Colorado, and where to find the date that actually counts.
Colorado state prison (CDOC)
Colorado uses determinate sentencing, with felonies grouped into classes and drug felonies into levels, each carrying a range of years. Once the court sends the sentencing order, the Department of Corrections calculates two dates that drive everything: the parole eligibility date and the mandatory release date.
The parole eligibility date, or PED, is the earliest a person can be released on parole. For most felonies, classes 2 through 6 and unclassified felonies, the general rule is eligibility after serving 50 percent of the sentence, less earned time. People sometimes call that 50 percent figure good time, but Colorado actually abolished old-style good time years ago and replaced it with this automatic halving for most offenses. Certain serious violent crimes are different and require 75 percent before eligibility, sometimes with earned time and sometimes without. The list includes things like second degree murder, first degree assault, first and second degree sexual assault, first degree arson, first degree burglary, and aggravated robbery.
Earned time is the lever that pulls the PED and the mandatory release date closer. It is awarded monthly, generally 10 or 12 days a month depending on the conviction, for participating in work, education, treatment, and other approved programs, and it is capped so it cannot exceed about 30 percent of the sentence. It is not automatic, it can be denied or taken back for discipline or for refusing required programming, and it cannot be earned on jail time before the person reaches state intake. Colorado has also added earned time for completing college credentials.
The mandatory release date, or MRD, is the date the sentence is satisfied and the person must be released if the board has not paroled them earlier. Between the PED and the MRD, release is up to the Colorado State Parole Board, which reviews eligible people around 90 days before the PED and requires an approved parole plan for where the person will live and work. One Colorado feature that surprises families: nearly every felony carries a mandatory period of parole supervision after prison, often two, three, or five years depending on the class, which the person serves in the community even if they were held all the way to the MRD.
When you look someone up, the two dates to read are the PED, the earliest possible parole, and the MRD, the outer release date. The board decides what happens in between.
How county jail fits the timeline
A county jail in Colorado is usually not where a release date lives. County jails mainly hold people who are awaiting trial and cannot post bail, people who have been sentenced and are waiting to be transferred into state or federal custody, and sometimes witnesses being held to testify in that jurisdiction. The only people with a real jail release date are the few serving a short local sentence, and for those the jail records office is who you ask. Note one Colorado wrinkle: earned time does not accrue for time sitting in a county jail before the person is available to the Department of Corrections, so the clock that matters for state credits starts at state intake.
Federal custody
If the case is federal, the rules are completely different and they are the same in every state. There is no federal parole and has not been for any offense committed on or after November 1, 1987. A federal inmate serves the sentence minus credits, then a separate period of supervised release in the community. Colorado has a significant federal presence, including the Florence complex, home to the federal supermax known as ADX, and the prison at Englewood, but a person can be designated anywhere in the country, so always confirm the location on the federal locator.
Two kinds of federal credit come off the time. Good conduct time is worth up to 54 days for each year of the sentence the court imposed, which works out to roughly a 15 percent reduction, so a ten-year sentence drops to about eight and a half years with full credit. Separate from that, the First Step Act lets eligible inmates earn time credits, up to 15 days for every 30 days they complete approved programs and productive activities, applied toward earlier transfer to prerelease custody like a halfway house or home confinement, or toward supervised release. Not everyone qualifies, a long list of offenses is excluded, and people under a final order of removal cannot have the credits applied. The Bureau of Prisons posts a projected release date on its inmate locator.
Why a release date can move
A projected date is a best estimate, not a promise, and several things shift it. Earned time is the everyday lever in Colorado, so participating in and completing programs is what pulls the PED and MRD earlier, while a disciplinary can claw earned time back and push them out. The parole board's decision is its own variable between those two dates. One-off events matter too, the way the federal CARES Act expanded home confinement during the COVID period. And cooperation with law enforcement can lead to a reduced sentence, through a federal motion for substantial assistance or the state equivalents that vary by jurisdiction. None of these is automatic, but each is a real reason a date you saw last month is different today.
Finding the date
Three tools cover almost every situation. VINELink, the victim and public notification service at vinelink.com, tracks custody status and release information, and it is worth checking in every state. For anyone in federal custody, the Bureau of Prisons inmate locator shows a projected release date. For state prison, the Colorado Department of Corrections inmate locator is unusually useful here because it posts both the parole eligibility date and the mandatory release date, so you can see the full window at a glance. Read which date you are looking at before you count on it.
A note on what these dates really are
Every release date here is an estimate the Department of Corrections or the Bureau of Prisons calculates and then adjusts as earned time, discipline, and program completion change. This is general information, not legal advice. For any individual case, the facility records office or an attorney is the authority, and they are the ones who can explain exactly how a specific date was reached.
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