This is my first year keeping bees, just outside Denver, Colorado, USA. I was planning on one hive but caught a wild swarm in the spring so I setup two (New Nuc in a regular Langstroth and wild ones in the Flow).
The Nuc hive seemed stronger all year but today, after our first snow (10"/25cm) and three days of cold temperature (6ºF/-14ºC) I found a massive die off on the nuc hive. Piles of bees on the ground in front and covering the entire bottom board. Still some live bees in the hive, but this is a lot of death.
After I dumped everything out from the bottom board:
Thoughts? Plenty of food in the hive, “only” three days of cold (60º weather the week before). THANKS