The Northern Lights should be visible from Montana tonight and tomorrow (9/28 - 9/29). The key for best viewing is eliminating light pollution. Here are some ideas where you can watch that are about 40 minutes or less from Billings.
If you stayed up until midnight last night you were treated to a full lunar eclipse or "Blood Moon". When the Earth blocks out the light from the sun only light from our planet can reflect off of the lunar surface which takes on a red hue.