My flowers are covered against the freeze, it's not freezing right in a minute, should I happen upon them until tonight?

I planted my annuals on mother's day when it be a wonderful 75 degrees. The subsequent night it be gonna get down to freezing (Colorado weather) so I covered them up. They're still covered and it's around 40 degrees right in a minute. It'll most likely freeze again tonight. Should I come across them now and contribute them a little street light or leave 'em covered until tomorrow?
Answers:    I live contained by Alberta where covering plants at hours of darkness and uncovering them during the day is a adjectives practice. I would suggest you let the neutral and air at them during the light of day, then cover them again at dark at least until you know the threat of overnight freezing have passed.
If you uncover, you may tolerate too much heat escape from the ground that they entail for protection from freezing. If they've been covered this long, they should be fine for another hours of darkness. I would worry more roughly moisture building up causing disease than need of light for a few days.