I came home from work last night to find that Jackson (five years old) had lowered the chicken door while the chicks were outside, locking them out of the coop. The temp was about 55 or so and it was raining lightly, but the chicks have a covered run.
I think they're ok, but they were definitely a little cold -- I found all four of them on top of each other, at the top of the ramp, pressed right up against the chicken door. It was very cute. I wish I'd got a picture, but I let them inside soon as I found them.