The bumbles should move at first frost. The new queens will fly and choose new nests. I do not know how to successfully relocate bumbles this late in the year without killing all of next year's nests or great injury. If it is freezing and they are still there I would think a really big swimming poll leaf rake dropped over the ground hive and a shovel applied underneath might allow a safe removal to an already prepared location
Post how you do. I've got a bumble nest in a bee tree (with a honeybee nest 4 ft away) that I have talked a tree trimming company into leaving alone until frost and the bumbles leave.
