Well, 8 weeks old today. I'll try to weigh a couple, but I'm guessing they'll dress a little over 4lbs each (all pullets). They came May 19. It immediately hit 90 degree days, so I brooded them in a rabbit hutch outside. At two weeks old they went into the tractor. June was even worse, most days were mid-90s and up. The first 8 or 9 days of July gave a little relief, but still no days under 90 for high. Mortality: One killed by a feeder at about 1 week old. One killed while moving chicken tractor at 3 1/2 weeks old. Dressed out a little bigger than a cornish game hen. Three killed by someone else borrowing my tractor (Kubota, not chicken). They didn't unhook all the way. These were just under 6 weeks and all dressed a little over 3lbs. No mortality due to disease, heat, or leg problems. Yet. I've got 3 1/2 more bags of feed I'm not going to waste. I think heat spikes are much more deadly than constant heat. These birds haven't seen any temperatures at all under 70. 56 days over 90. This is my second batch of Cornish X from McMurray. I'm happy. My next batch with be color rangers, but I'm definitely not jumping on the Cornish X Hater bandwagon yet.