This advice in the writeup is BS:
“Freezing is just the act of losing heat,” he said. “So, if that blossom is closed up, that’s holding onto heat. Right here, this block is full bloom, all the way open,” he said pointing to the orchard in front of him. “So, it’s more vulnerable, and once those petals fall off, it’s just that much more vulnerable.”
A closed blossom doesn’t hold onto the heat. It’s less freeze sensitive. I’m surprised about his lack of knowledge about the physics and physiology of freeze damage.
Also throwing a tarp over a tree is almost no help without a heat source inside. I usually have to wait until dark just before a freeze for the wind to drop enough to put on a tarp. I’ve been out tarping until midnight several times.