Criminal Defense Attorney
It is a misdemeanor offense, so by legal definition it is "minor". However, I would disclose it if the nature of the question is trying to reveal what criminal record you have. If you are found later to have not disclosed what they think you should have, it could have worse consequences than if you would be open about it at the beginning. You may want to talk with someone in the administration on a more personal level about your matter.
This is not meant to be legal advice but only a general response to a general question. Legal advice requires more attention to details and circumstances to be accurate and reliable. Do not rely on this response as legal advice. If you want legal advice about your matter, you must set up a consultation with this attorney by calling (406)756-911.
DUI / DWI Attorney
No. Speeding is a minor traffic violation.
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General Practice Lawyer
You might try first reading the application instructions closely. If the college is in another state, the legal distinction between major and minor and Montana's misdemeanor and felony categories might not be the same for a DUI per se. If the instructions do not make this clear, ask as advised above.
DISCLAIMER: I am not your attorney and readers employ any information provided herein at their own risk. Any comment is for general educational purposes only, and is based only on the limited facts provided, which may or may not be true. It is not legal advice upon which you may rely, as the commenter has not interviewed witnesses or examined any evidence, and has not researched the applicable law. Available defenses may prevent the success of any claim. Competent legal advice should always be obtained from a lawyer licensed in your jurisdiction before taking any legal action or filing suit.