There is a good review of the topic, and list of detailed publications, in the
1992 edition of The Hive and the Honey Bee p 850 -868. I'm familiar with several
indoor wintering operation near here. Bees (1000-2000 col) are moved indoors
after the weather is consistently below freezing (mid November) and removed late
March to early April. Survival 75-90% of colonies. Outdoor overwintering can be
more successful in the same area (stronger colonies in mid April) but takes more
labour and feed.
Kerry Clark, Apiculture Specialist
B.C. Ministry of Agriculture
1201 103 Ave
Dawson Creek B.C.
        V1G 4J2  CANADA          Tel (604) 784-2225     fax (604) 784-2299
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