my newest flock addition is now 6 and 7 weeks old. (two sets of chicks all brooded together.) we are in southwestern BC and the nights are about 50-55 degrees. the days have been a balmy and warm 70-75 degrees. i know my others two years ago went outdoors in the mid-spring to early summer but i've forgotten when. they are out all day, in a tractor as it has been sunny and warm. i would love to know how you approach this in the PNW, or with similar temps? thanks!