Ask:
anyone know where these things nest?Are there's in the ground?
Answer:
Bumblebees like to nest under flat objects. They like to feel something on top and underneath them as they nest. This leads them to find nests under boxes, under low profile decks, under rocks, under wood chips or pine straw, between wood logs of a wood pile or landscape timbers, undera patio slab, under a tarp or just about any manmade or natural object which is lying on the ground that they are able to crawl under. Although nests are abandoned every year, it is common for a new nest to start close if not in the same location as a nest the preceding year.
Also since the nest is very small the nest is usually no bigger than the size of 1/2 a grapefriut even at the busiest time of summer.
There are some who provide Bumble Bee houses in their gardens to promote the pollination of their flowers.
Do you have them in your yard?