I'm in the NW corner of Oregon and have a simple solution to the heat for my mixed flock (Which includes black chickens) I planted a grape arbor. 16 feet of arbor to be exact. I bought some gold colored wine grape out of the bargain bin a few years ago (no tag on it) and built it an arbor that built like an open box 16 ft long, 10 ft wide, 6 ft tall with wires strung the full length of it on top to give the grapes something to grab onto. I just let the grape cover the arbor with no attempt to prune it except where it wandered off the arbor and down the fence. Now I have the best and coolest of chicken summer shelters around. They spend their summers happily chilling in the heavy grape leaf shade under the arbor, and the grapes are incredibly prolific and delicious for all the extra fertilizer.
Something about greenery used to create a shade spot seems to work so much better than any of the tarps and other shelters I've used in the past.
Something about greenery used to create a shade spot seems to work so much better than any of the tarps and other shelters I've used in the past.