I am in the North East, and I had a couple girls that have always gone back on feed in previous years by like March - April, but this year it took till late May - June for everyone to start eating again. I believe it was maybe because we had a very, very mild spring and we just started getting 75-85 degree days about two weeks ago. My het Pied girl was a little over 1350 grams roughly last fall when she went off feed in November, I was gonne breed her anyway because it was her third winter as she was a very late 05 baby, but she never went. There bodies know when they are ready i guess? Anyway, I was really anxious to get her feeding and up and over the 1500-2k gram range by fall without having to over feed her, but she wouldnt eat until about 10 days ago.
Your post should be a very good example for the people who post and say "my snake hasnt ate for 3 weeks", they should realize these snakes can go a looonngg time without eating and still be ok. Also. like you seemed to hint at in your post and I feel as well, and its that you dont really need to be concerned unless they start losing body mass. If you have a 1800 gram snake and it loses 30% body mass you have a problem, unless it laid a bunch of eggs that is. If you have a 1800 gram snake and it loses 100 grams over 10 months, I dont really worry too much