Utah has opted out of the federal exemptions, but the opt-out
applies only to its residents and those who have been
nonresidents for fewer than 180 days. "An individual may not
exempt from the property of the estate in any bankruptcy
proceeding property specified in [section 522(d)] unless the
individual is a non-resident of this state and has been for the
180 days preceding the bankruptcy":  Utah Code Ann. §
78B-5-513.

Therefore, if Utah is the applicable state (as determined by the
method stated on the home page of this site), the debtor may
use the federal exemptions if the debtor has not been a
resident of Utah for more than 180 days as of the date of filing
bankruptcy.

Click here for support.

Please note that the following case is not relevant to this
question because it was decided when a prior version of the
Utah opt-out statute was in effect:
In re Katseanes, 2007 WL
2962637 (Bankr. D. Idaho 2007).

Note that debtors who are not residents of Utah may prefer to
use the federal exemptions rather than the Utah state
exemptions because Utah's homestead exemption does not
apply to property located outside the state.