Montana has seasons on both but not concurrently unless you are an archery hunter. Antelope tags are only available through a drawing. Non-resident tags are limited to not more than 10% of the available tags in any unit. The deadline for antelope applications in Jun 1.
Archery antelope season is Sep 7 to Oct 11
Rifle antelope season is Oct 12 to Nov 10
Sage grouse season is Sep 1 to Sep 30
Non-resident antelope license is $205 + Base hunting license of $15 + Conservation license of $10
Non-resident bird license is $110