* WHAT...For the Freeze Warning, sub-freezing temperatures expected. For the Freeze Watch, sub-freezing temperatures possible. * WHERE...Portions of northwest, southwest, and west central Colorado and east central, northeast, and southeast Utah. * WHEN...For the Freeze Warning, until 10 AM MDT Friday. For the Freeze Watch, from late Friday night through Saturday morning. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing.