We've had some arctic air move down and the wind chills are sitting between -10 and -20 below. The horses have a shed to get into, except for one and he has a wind block, but not exactly a shelter per se. Some of them are choosing to stay out anyway where the hay is. It's extremely cold and the wind is really strong. How cold can a horse stand it? 3 of them have blankets including the one that can't get inside a shelter. The other two wouldn't let you within 20 feet of them with a blanket. It's supposed to stay this way for 2 more days with near zero temps and strong winds before it's supposed to warm back up into the 40's. Is it spring yet?