* WHAT...Sub-freezing temperatures as low as 26 to 30 expected.
* WHERE...Central Yampa River Basin, Lower Yampa River Basin, Upper Yampa River Basin, San Juan River Basin, and Central Colorado River Basin.
* WHEN...From midnight tonight to 9 AM MDT Saturday.
* IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing.