So I left the vacuum pump running last night not expecting a freeze. Got there this morning at 7 to find only 20 gallons had run overnight. Wet line full of ice as far as the eye could see. A trickle coming out the dry line, which soon was full of ice too. It took until about 10 am for the dry line to clear up and about 12:30 pm the wet line let loose. Quite something to have the releaser dump every minute for 10 minutes.
Really looks like that might be the last freeze for me - but it was a surprise to get that one. Usually if its borderline we stay too warm up here on the hillside. I have no plans to pull taps yet, though.
10,000 gallons of sap down, 5,000 to go. Fat chance.