I feel your pain. Yesterday I got 30 out of my 60 or so taps, and 17 the day before. Before that, I don't think i had any since Tuesday or Wednesday last week. What a weird year.
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Well this season is a bust. The trees are budding and I have 26 gallons of which I do not think will be any good to boil. Its taken 4 weeks to get that much and I believe that 4 week old sap would be not be good to boil, is that correct?? It would only get me maybe a 1/2 gallon anyway.
I guess with having a drought through the summer and into December and then temps in the winter which did not drop below 30 for most of the season is the cause. Not sure about the drought part but maybe someone here knows how a prolonged dry spell affects the trees. It did become very wet in December through the maple season but just not cold.
4 weeks is probably too long for the sap to be good, but if you had boiled it as you go and stored each little boiled batch separately in the fridge, you could now boil it all into syrup.
Of course, the worst that can happen is that it will taste bad. You could try boiling now to make sure you kill anything, and give the sap a taste. If it tastes good, you're good and you could finish it to syrup.