How Release Dates Are Calculated in Montana

If you or someone you love is doing time in Montana, the release date depends on when the parole eligibility date is reached and whether the Montana Board of Pardons and Parole decides to grant parole. Montana courts impose a fixed sentence rather than a minimum and maximum range. The parole eligibility date is calculated at one fourth of that sentence - with no good time reduction applied to that calculation for modern offenses. After the eligibility date is reached, the Board holds a discretionary hearing and decides whether to grant parole. If parole is repeatedly denied, the person serves the full sentence.

This guide walks through how Montana calculates a release date step by step: the fixed sentence structure, how the parole eligibility date is calculated, the three-era system based on offense date, how good time does and does not affect the calculation, how the Board decides, life sentences, and the prerelease center pathway. None of this is legal advice, but it will help you read your own time the way the Montana Department of Corrections does.

Here is the short version.

Montana courts impose a fixed sentence. For offenses committed after January 31, 1997, the parole eligibility date is 25 percent (one fourth) of that sentence, reduced by any time credited from jail before sentencing. No good time credit reduces the parole eligibility date. If parole is not granted, the full sentence must be served - there is no good time reduction of the discharge date for modern offenses. For life sentences, the person must serve 30 years before becoming eligible for parole. The Board of Pardons and Parole holds a discretionary hearing at the eligibility date and may grant parole if the release is unlikely to harm the prisoner or the community.

Step one: the fixed sentence and parole eligibility structure

Montana courts impose a fixed sentence - a specific number of years rather than a minimum and a maximum. Because there is no maximum separate from the imposed sentence, the parole eligibility date is calculated from the total sentence the court pronounced.

For all offenses committed after January 31, 1997, the parole eligibility date is one fourth of the sentence, reduced by any jail credit for time spent in custody before sentencing. The Prison Records department calculates this date, and the information is given to the Board of Pardons and Parole and to the offender.

The Board is notified two months before the parole eligibility date and schedules a hearing. Reaching the eligibility date does not mean parole is granted - it means the Board can now hold a hearing and make a discretionary decision.

If parole is denied at the initial hearing, the Board sets a future review date. The person continues serving the sentence until either parole is granted or the full sentence is served. The total time served on parole counts as time served on the sentence.

Step two: the three-era system and how offense date matters

Montana's sentencing history created three distinct eras, each with different parole eligibility calculations. The era that applies depends on when the offense was committed.

For offenses committed after January 31, 1997 - which covers virtually everyone entering the system today - the rule is straightforward: parole eligibility at 25 percent of the sentence, with no good time applied to that date. The discharge date is 100 percent of the sentence, also without good time reduction.

For offenses committed between April 13, 1995 and January 31, 1997, a transitional framework applies. The parole eligibility date is also 25 percent, and the dangerous offender designation was removed from the eligibility calculation. However, inmates in this group continue to receive good time credits that reduce the discharge date.

For offenses committed before April 13, 1995, the older system governs. Under that system, a nondangerous offender was eligible for parole after serving one fourth of the sentence minus any good time earned in prison and minus any jail credit. A dangerous offender was required to serve one half of the sentence with the same deductions for good time and jail credit. Good time also reduced the discharge date under this older framework.

For families of people serving sentences for modern offenses, the relevant calculation is simple: one fourth of the sentence for parole eligibility, and the full sentence as the outer limit.

Step three: good time and the discharge date

Good time works differently in Montana than in most other states in this series.

For offenses committed after January 31, 1997, good time credits do not reduce the parole eligibility date. The 25 percent calculation is based on the raw sentence with only jail credit deducted. Good time has been removed from the parole eligibility calculation entirely for this era.

For the discharge date, the rule is also straightforward for modern offenses: the person is required to serve 100 percent of the sentence imposed by the court. If the Board never grants parole, the sentence is served in full.

For the transitional period (April 1995 to January 1997), inmates continued to receive good time credits at the rate of 30 days per month toward the discharge date, though not toward the parole eligibility date.

For offenses committed before April 13, 1995, good time was earned at a day for day rate and reduced both the parole eligibility date and the discharge date.

The practical consequence of this structure for modern Montana sentences is significant: there is no mathematical mechanism to reduce the time before either the parole hearing or the discharge. The parole eligibility date is fixed at 25 percent of the sentence, and the discharge date is fixed at 100 percent. The only variable is whether the Board grants parole between those two points.

Step four: the Board of Pardons and Parole and how it decides

The Montana Board of Pardons and Parole is the sole authority for granting parole. Under Montana law, the Board may grant parole when in its opinion there is a reasonable probability that the prisoner can be released without detriment to the prisoner or to the community.

Every hearing panel consists of three Board members. One member serves as the lead and conducts the investigation on the case in advance. The hearing format is structured: statements must be directed to the Board members, not to the offender; no one under 18 may appear; and no name-calling or addressing the offender directly is permitted.

The Board considers many factors in its parole decision: the nature and severity of the offense, multiple offenses or prior criminal history, the offender's institutional conduct, participation in recommended programming, victim impact, and the release plan. Common denial reasons listed in Board dispositions include the nature or severity of the offense, poor institutional conduct, prior history on supervision, multiple offenses, and need for additional programming.

After a parole denial, the Board sets a future review date - sometimes months away, sometimes years, depending on the circumstances. Offenders who are granted parole are supervised under standard parole conditions until the expiration of the original sentence.

If a parolee commits a new crime while on parole, that sentence is served consecutively with the remainder of the original sentence.

Step five: life sentences and special circumstances

Life sentences in Montana carry a separate parole eligibility threshold. A person serving a life sentence must serve 30 years before becoming parole eligible. The Board of Pardons and Parole then makes the same discretionary decision it makes for all other parole cases.

Montana law also requires that offenders convicted of sexual or violent offenses register with the Montana Department of Justice. This registration must be completed 10 days before release from the institution and may add some processing time to the release.

In 2023, the Montana Legislature passed a law authorizing the Department of Corrections to place inmates in prerelease centers to prepare for community reintegration. To be eligible, an inmate must be within 14 months of the parole eligibility date or within 14 months of the discharge date. Prerelease center placement is not a right, and eligibility is subject to Department of Corrections policy.

Montana also allows parole to another state through the Interstate Compact for Adult Offender Supervision. Offenders paroled to another state must have immediate family in that state willing to provide financial support, among other requirements.

Putting it together: a worked example

Here is how the pieces fit, using a simple example. None of these numbers are legal advice, but they show the method.

Take a person sentenced to 20 years for a felony committed after January 31, 1997. The parole eligibility date is 25 percent of 20 years, or 5 years, reduced by any jail credit from time served before sentencing. The Prison Records department calculates this date. Two months before the 5-year mark, the Board is notified and a hearing is scheduled. At the hearing, the Board considers the offense, institutional conduct, programming, victim impact, and the release plan. If parole is granted, the person leaves custody and is supervised until the 20-year mark. If denied, the Board sets a future review and the person continues serving. If the Board never grants parole, the person is released at 20 years - the full sentence.

For a person serving life, the parole eligibility date is 30 years. The same hearing process applies.

The bottom line for Montana

Montana release dates are anchored by the fixed sentence and the 25 percent parole eligibility threshold. Good time does not reduce the parole eligibility date for modern offenses, and the discharge date is the full sentence if parole is never granted. Life sentences require 30 years before the Board can act. The Board's standard is a reasonable probability that release would not be detrimental to the prisoner or the community. Programming, conduct, and the release plan are the most controllable factors.

The practical takeaways are clear. First, calculate the parole eligibility date at 25 percent of the sentence minus jail credit - the Prison Records department does this calculation formally, but knowing the number helps families plan. Second, complete all programming recommended through the Department of Corrections risk and needs assessment before the first Board hearing, because the Board frequently cites incomplete programming as a denial reason. Third, prepare a realistic release plan with housing, employment, and support, because the Board considers the viability of the plan in its decision. Ask the Montana Department of Corrections for the sentence computation showing the parole eligibility date and the discharge date.