Or "Hoar Frost" as it's called around here. (maybe around your area too).
When DH and I moved here, the first winter we had this phenomenon and must have taken 100 pictures. It's so neat to see. We've had fog for the past 2 days with temps in the 20's , so it just settles on the branches forming tiny ice crystals. It is crystal clear above the fog, and the sun is trying to peek through today, so it will probably be gone this afternoon.
Looks like a flocked Christmas tree, huh?