8 RIR are 7 weeks old and 10 Bard Rocks are 6 weeks old. I'll have the skin on the coop by Sunday. I want to move them in ASAP. I removed there 250 Watt heat lamp from the brooder this morning to start getting them acclimated. Morning temps tend to stay above 20 degrees Fahrenheit. These are my first and only chickens so far, so I don't have to worry about bigger birds picking on them. They will be on a dirt floor covered with deep litter. Is it too soon to evict them from the brooder in the garage?