I do have a vacuum pump so I know that helps. I started looking at vacuum 20 years ago when we had a really warm winter and producers that had it did better than I did. It took me 10 years to get it but that's why.
I think zone 3 is a fair assessment. There's a rule of thumb in weather forecasting that every few hundred feet of elevation is similar to being a certain amount of latitude north. I'm at 650' at my house but one of my sugarbushes is around 1-1200' and is north facing. I also have one at 300' in the valley where my sugarhouse is (it's on our farm in Somers where I grew up) so a good variety.
I saw the same thing on this side of the state. It seemed like it took a while to get things going but I saw some action before I headed home.
For what it's worth, I think things look good the next few weeks. This Thursday looks like the warmest day but consistently below normal after that. I use this site to get a consensus on temperatures. Focus on the graph on the right. Every one of those of those is a model and I look at the mean value. All below normal:
https://www.wxcharts.com/?panel=defa...18&skewtstep=0
You can click on the map for a graph for your location. It's been very consistent with that which gives me hope going into March.