27 overnight.  42 and sunny during the day.  The trees responded.  A perfect day in the woods.  We picked up 600 gallons of sap.  Started the evaporator after collecting, about 6:45 PM.  Cooked late into the night because we expect more sap tomorrow.  All tanks were full and we needed to empty some to make space in the tanks.  Sap at 3 brix.