Glossary
The comprehensive management approach for preparing honey bee colonies to survive through winter dormancy. Successful overwintering depends on four pillars: adequate food stores, low varroa mite loads, proper ventilation (moisture control), and sufficient colony population of healthy young winter bees.
Food stores: Colonies in temperate climates need 60-90 pounds of stored honey (roughly 8-12 full deep frames). In Florida, requirements are lower (20-40 pounds) because the mild winter allows occasional foraging. Weigh hives by hefting the back of the hive; heavy hives have adequate stores.
Mite management: Late summer (August-September) varroa treatment is the single most important overwintering preparation. Winter bees must be free of mite-transmitted viruses (especially deformed wing virus) to survive the 4-6 month winter lifespan. Mite levels above 2 percent in September are critical.
Moisture management is crucial in cold climates. The winter cluster generates water vapor through metabolism. If this moisture condenses on cold interior surfaces and drips onto the cluster, it can kill bees more effectively than extreme cold. Upper ventilation (quilt boxes, propped inner covers, or moisture boards) allows moisture to escape while retaining heat.
Population: Colonies need enough bees to form a cluster large enough to maintain interior temperatures above 55-60 degrees Fahrenheit at the cluster's surface. A minimum of 6-8 frames of bees going into winter provides adequate mass for cluster survival.
In temperate climates, winter preparation effectively begins in August with varroa treatment. September involves assessing food stores and feeding if needed. October includes reducing entrances, adding insulation or moisture boards, and final inspections. The colony should be fully winterized by the end of October.
Avoid opening hives in cold weather to feed. If a colony is light going into winter, feed heavy syrup (2:1 sugar to water ratio) in September and October. Emergency winter feeding options include sugar boards (dry sugar on newspaper), fondant placed directly on top bars, or winter patties.
The top killers are varroa-transmitted viruses (weakened bees cannot sustain the cluster), starvation (insufficient honey stores), and moisture (condensation dripping on the cluster). Cold alone rarely kills healthy, well-provisioned colonies because the cluster generates its own heat effectively.
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