Utah Code § 20A-19-102: Permitted Times and Circumstances for Redistricting.

Division of the state into congressional, legislative, and other districts, and modification of existing divisions, is permitted only at the following times or under the following circumstances:

(1) no later than the first annual general legislative session after the Legislature's receipt of the results of a national decennial enumeration made by the authority of the United States;

(2) no later than the first annual general legislative session after a change in the number of congressional, legislative, or other districts resulting from an event other than a national decennial enumeration made by the authority of the United States;

(3) upon the issuance of a permanent injunction by a court of competent jurisdiction under Section 20A-19-301(2) and as provided in Section 20A-19-301(8);

(4) to conform with a final decision of a court of competent jurisdiction; or

(5) to make minor adjustments or technical corrections to district boundaries.