Had that a couple years ago here. I thought we weren't going to get any sap. Turns out the frost was so deep that the sap didn't start running until the ground thawed a bit. We got 3 days of good sap then it got too warm.Looks like it’s going to be a disappointing maple syrup season. Buckets are bone dry I’m usually on the second boil by now with a few gallons canned . If it warms up to fast the buds will pop on the trees and the season will be over