Winter losses
Honey bee colonies in temperate climates face annual winter mortality averaging 30-48% in the United States (Bee Informed Partnership surveys, 2010-2024). The primary drivers are varroa mite infestations and associated viruses, starvation from insufficient honey stores, moisture condensation inside the hive, and cold stress on undersized clusters. Losses vary widely by region, management practices, and winter severity, but even experienced beekeepers routinely lose colonies each year.
- Winterize hives with insulation and ventilation5
Wrap hives with insulating material, reduce entrances, and add upper ventilation before sustained cold arrives -- typically by mid-October in northern climates. This combination protects colonies from the three physical killers: cold wind, heat loss, and interior moisture condensation.
📌 best practice4/16/2025, 9:22:01 PM
🛠️ Hive wraps or rigid foam insulation, entrance reducer, moisture quilt or notched inner cover, ratchet straps, hive tool
- Treat for varroa mites in late summer and fall5
Apply an effective varroa mite treatment in August-September, timed so that the long-lived "winter bees" (born September-October) develop with low mite parasitism. Colonies entering winter with mite loads above 2-3% infestation rate face dramatically higher mortality.
📌 best practice4/16/2025, 9:22:01 PM
🛠️ Alcohol wash kit or sugar roll cup, mite treatment (formic acid strips, oxalic acid vaporizer, or amitraz strips), gloves, hive tool
- Combine weak colonies in fall to build viable clusters4
Assess colony populations in September and merge any colony covering fewer than 6-8 frames of bees into a stronger unit using the newspaper method. A viable winter cluster requires roughly 20,000-30,000 bees -- two weak colonies left separate almost always both die, while combined they often…
📌 best practice📌 free4/16/2025, 9:22:01 PM
🛠️ Newspaper, hive tool, protective gear