I checked on my bees a few days before Christmas and it looked like I needed to feed them. about four days later I went out with some sugar and they were all dead. There was a cluster of them between some of the frames, but all dead. It was actually warmer during that time than it had been in the few weeks before, but I'm wondering if opening the hive that day let out enough heat to kill the bees (it was probably 20 that day, but much colder in the weeks leading up to it).
I'm going to need more bees, of course, so my question is if there is a beesource people would recommend for cold Colorado winters. I got the last batch from a place in Texas, and I'm wondering if they just weren't able to adjust to -12 or whatever it was we had in early December.