Around here (Michigan) the bumblebee nests tend to be at, or slightly above, ground level. I’ve stumbled upon a couple of wild hives in mid spring among my gardening debris. It’s said the spring queens like to move into old mouse nests. I haven’t found that yet, but it makes sense when you see the spring queens flying just above the grass as if they’re looking for something (ie an old mouse nest). I’ve tried to bee-line those big ole spring queens, but I haven’t been successful with that yet either.
I would like to relocate a colony into an observation hive for study this spring if I get the time.