Thursday night we put them out but they were scared and cried. We picked them up around 1am and put them back in the brooder.
Friday we put them in the brooder all day and they all went to sleep around 10pm. They went upstairs to the nesting area around midnight. They peeped quietly a bit then fell asleep.
Today (Saturday) we moved the tractor a few feet to expose a fresh bit of chicken-yard interface. This evening they nested by sundown. I left them a little 25w "nightlight" to calm them. They need it less and less but I want the transition to outdoor life to be as easy as possible.