The BillingsLUG meets the 3rd Thursday of the month.
1440 Grand Ave.
(Behind the former China Express)
Meetings start at 6PM and have no formal ending time but usually end around 8PM.
Meet up with Montana Linux people on IRC. We currently gather at the #ubuntu-montana room on the freenode network. Stop in and say "hello" or even ask/answer some questions. Don't have to be a Ubuntu user either. Or use the web-based chat client.