I tapped 7 trees on the 11th for a run of 3/16" tubing and started checking it daily. It was flowing this morning (Valentine's Day). This is only my third year, but the trees have never thawed this early for me. I went out and tapped another 21 trees today. I have three separate runs on 3/16" tubing with about a 30' drop in elevation. All three runs are flowing now.