I have been indoor wintering for about 15 years.

last 5 years 300 - 400 hives inside, mostly new colonies made in last 
summer.

Dark cellar, -1 to +8 C. Mostly dry in winter, but humid when snow 
starts to melt outside.

No brood when I take the hives out in April.

Colonies wintered outside have brood in 1-3 frames at this time.

Breeds, Italian, carnica, buckfast no difference.

Some old beekeepers claimed that if humidity is high the bees will start 
brood rearing in cellars, but I have never seen it, so not sure if this 
is true.

Ari Seppälä
Finland

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