Mont. R. Civ. P. 59

(a) In General.

(1) Grounds for New Trial. The court may, on motion, grant a new trial on all or

some of the issues -- and to any party -- as follows:

(A) after a jury trial, for any reason for which a new trial has heretofore been

granted in an action at law in Montana state court; or

(B) after a nonjury trial, for any reason for which a rehearing has heretofore been

granted in a suit in equity in Montana state court.

(2) Further Action after a Nonjury Trial. After a nonjury trial, the court may, on

motion for a new trial, open the judgment if one has been entered, take additional

testimony, amend findings of fact and conclusions of law or make new ones, and

direct the entry of a new judgment.

(b) Time to File a Motion for a New Trial. A motion for a new trial must be filed no

later than 28 days after the entry of judgment. The motion for a new trial must set forth, in

the heading of the motion and under the cause number and department identification, the

date which is 60 days from the date of the filing of the motion, and the date which is 120

days from the date of filing of the motion.

(c) Time to Serve Affidavits. When a motion for a new trial is based on affidavits, they

must be filed with the motion. The opposing party has 14 days after being served to file

opposing affidavits. The court may permit reply affidavits.

(d) New Trial on the Court’s Initiative or for Reasons not in the Motion. No later than

28 days after the entry of judgment, the court, on its own, may order a new trial for any

reason that would justify granting one on a party’s motion. After giving the parties notice

and an opportunity to be heard, the court may grant a timely motion for a new trial for a

reason not stated in the motion. In either event, the court must specify the reasons in its

order.

(e) Motion to Alter or Amend a Judgment. A motion to alter or amend a judgment must

be filed no later than 28 days after the entry of the judgment.

(f) Motion Deemed Denied. If the court does not address in a written order a motion for

a new trial properly filed according to Rule 59(b), or a motion to alter or amend a judgment

properly filed according to Rule 59(e), within 60 days from its filing date, the motion must

be deemed denied. If the court issues an order within the 60 days extending the time within

which to rule on the motion, the time for ruling may be extended, but if the motion is not

ruled upon within 120 days from its filing date, it will be deemed denied.