If you put a heatlamp out in the coop at night just for insurance that they
Can get under you will be fine to put them out. I am in NC, and we have been
Having some cool nights and a few cool days here and there and I have had mine out
In the coop for over a month now and they are doing great. Mine were also
Only about 3 weeks old when I start putting them out, and they are mixed in
With chicks from 3 weeks old up to a couple laying hens and roosters that have
Taken up the role of gaurdian to the chicks.
I have a heat lamp in 1 corner so the wee ones can warm up if needed and I
Haven't lost any by doing this, and I have done this for close to 100 chicks since
Last spring.
I think you will be just fine, good luck!
CT