Wyo. R. Prac. & P. 35
The court may correct an illegal sentence at any time. Additionally the court may correct, reduce, or modify a sentence within the time and in the manner provided herein for the reduction of sentence.
A motion to reduce a sentence may be made, or the court may reduce a sentence without motion, within one year after the sentence is imposed or probation is revoked, or within one year after receipt by the court of a mandate issued upon affirmance of the judgment or dismissal of the appeal, or within one year after entry of any order or judgment of the Wyoming Supreme Court denying review of, or having the effect of upholding, a judgment of conviction or probation revocation. The court shall determine the motion within a reasonable time. Changing a sentence from a sentence of incarceration to a grant of probation shall constitute a permissible reduction of sentence under this subdivision. The court may determine the motion with or without a hearing.
Wyo. R. Prac. & P. 35