An officer may resign, but the resignation is not effective until it has been accepted by the governor.
Mont. Code Ann. § 10-1-204
Resignation of officers
En. 77-1704 by Sec. 34, Ch. 94, L. 1974; R.C.M. 1947, 77-1704.
Official source: Montana Code Annotated (Montana Legislature). Reproduced from public-domain Montana statutes; confirm against the official source for the current text. Not legal advice.