Will Carington, works for Noodle
The answer is actually a little complicated. In general, the rule is that you must have lived in Utah continuously for one year prior to the term for which you'd like to receive in-state tuition. However, there are a number of exceptions. For example, if you are married to a Utah resident or if your parents recently moved to Utah for full-time employment (and the move was not educationally motivated), you may qualify for in-state tuition. Southern Utah University provides this residency questionnaire which can help you determine whether you're eligible for in-state tuition.
Hope this helps!