Visit the MT Secretary of State's website and look yourself up.
You'll need to enter your first name, last name, and date of birth. You'll need to type in your name without spaces or punctuation. If your name can't be found, you may not be registered to vote.
Check the address where you're registered.
Make sure the address where you are registered is your current address. This ensures you are able to vote for the correct local representatives for the area where you live. Many counties are also conducting elections by mail, so they need to know where to send your ballot.
Check to see if your voting status is "active" or "inactive."
If your voting status is "inactive," and you live in a mail ballot election county, you will not automatically receive a ballot in the mail. Even if you are "inactive", you are still considered registered and can vote! You will need to contact your county elections office to request a mail ballot, or vote in-person.