A large number of bumble bee queens of B. terrestris L. and B. lapidarius L. were hibernated in a refrigerator at 4-5° C. Each queen was placed in a plastic container with Perlite as bedding. Of a total of I079 queens, 75I (7I %) were alive after 8-9 months of hibernation. The queens lost in body weight during hibernation. The weight losses occurred during the first half of the hibernation period after which time the body weight increased. Significant, positive correlations were found between the body weight of the queens and the length of the period of survival during and after hibernation respectively.