Chilled brood
Chilled brood occurs when developing bee larvae and pupae are exposed to cold temperatures, typically below 90°F (32°C), for extended periods. Bees maintain a specific brood nest temperature for optimal brood development. If hive temperature drops too low, especially in spring or during cold snaps, bees may be unable to adequately heat the brood nest, leading to brood chilling and mortality. Chilled brood can result from insufficient bee population to heat the brood nest, inadequate hive insulation in cold weather, or excessive hive ventilation. Chilled brood weakens colonies and reduces brood viability.
- Insulate hives in cold weather4
Wrap or cover hives with insulating materials during cold weather to help bees maintain stable brood nest temperatures. Apply insulation before winter sets in and remove it gradually in spring as temperatures stabilize.
📌 diy📌 low cost4/16/2025, 9:22:02 PM
🛠️ Insulation materials, hive wraps
- Reduce hive entrances in cold weather4
Install entrance reducers during cold weather to help bees maintain brood nest temperature and prevent chilling. Set the reducer to the smallest opening for weak colonies or during severe cold, and widen it as temperatures rise or the colony grows.
📌 diy📌 low cost4/16/2025, 9:22:02 PM
🛠️ Entrance reducer
- Ensure strong colony population3
Maintain a strong, populous colony heading into cold periods so bees can adequately thermoregulate the brood nest. Assess colony strength in late summer and take corrective action before winter arrives.
📌 best practice📌 traditional4/16/2025, 9:22:02 PM
🛠️ None