I guess CO isn't in the United States. It was 0 f last night and -10 f for three nights before that.
In this mid-Atlantic urban center, we have not yet had a killing frost event. The tender coleus have lost their leaves, but the begonia plants are still blooming well. This weekend may finally do it. First freeze in January??? I thought I was doing well when I harvested tomatoes up to Dec. 6th back in the early 2000s.