There are many hidden consequences of a Utah DUI conviction. One of those consequences is the inability to enter Canada. I have had clients, where their case was totally dismissed, and yet they received a lot of grief trying to enter Canada. According to this web site, you do not even have to be convicted of the crime. If a charge is pending, you are deemed inadmissible into Canada. If the charge was held in abeyance (pled guilty, but will be dismissed after good behavior for several months), you are deemed inadmissible into Canada.
There is still hope. The site tells of ways to enter Canada, but it takes time and is tricky.