In the past 7-8 years I've tapped any where from before 1/20 to mid March. I watch the 15 day forecast and start tapping as soon as I see sap flow weather appear in the forecast. Since it has been so cold, it will take a few days once it warms to thaw the trees, watch for that. Mid thirties take a very long time to thaw a tree that may be 10-15F inside. Low forties do it much faster.
Dave Klish, I recently ordered a 2x6 wood fired evaporator from A&A Sheet Metal which I will be converting to oil fired
Now have solar, 2x6 finish pan, 5 bank 7x7 filter press, large water jacketed bottler, and tankless water heater.
Recently bought another Gingerich RO, this one was a 125, but a second membrane was added thus is a 250, like I had.
After running a 2x3, a 2x6, 3x8 tapping from 79 taps up to 1320 all woodfired, now I'm going to a 2x6 oil fired and a 200-425 taps.