jv...those I have outside in the big Pepsi box quit raising in the winter so I usually keep some in the shop in a large styrofoam cooler. Its warm enough in my shop that they will raise all winter. I just started the cooler in the shop last week. I put about 75 worms in it. I will have enough worms for my winter fishing and when spring gets here there will be probably 2000 worms in that cooler. They multiply like crazy. I feed the ones in the cooler corn meal everyday and keep them covered with news papers....when the news paper gets dry...I wet it down good.