I got a package of bees for my Warre hive in the Spring. Currently I have 3 boxes, but the bottom one is completely empty. Do I remove it for the winter so the volume is smaller or leave it so it will be available when the bees need it in Jan/Feb? I live just north of San Francisco so winters are quite mild?
I’d remove the empty box and store it along with the combs from your other hive. Then as soon as spring arrives I’d add at least one box – probably 2 – to the bottom.