Submitted by here_f1shy_f1shy t3_1046qt8 in vermont
Criteria is usually when it's above freezing during day and below freezing at night during spring. Usually Feb-March(ish).
Would you get good sap right now? Half tempted to tap a tree just to see.
Optimized_Orangutan t1_j3349d5 wrote
Big ops were boiling on new years this year. Small ops probably weren't ready to roll yet and/or didn't get enough sap to boil.
Edit: short answer: if it's below freezing at night and above freezing during the day sap will run. Trees don't have calendars.