There is a lot of information on keeping a compost bin teeming with night crawlers. earthworm bin - Google Search You could buy or build a box specifically for raising worms, although, if you wanted to have feeder worms available year 'round you would have to keep them cool during summer months, and warm during very cold months.

Around my home, a huge pile of rotting leaves (generates heat even when it's freezing outside) and compost is a great place to find them, although, in the summer when it's hot, they burrow deep under the compost and can't be found, no matter how wet I keep it. they prefer soil temps at 50-60 degrees. Any warmer, they go deeper. I have kept them in the fridge at 40 degrees for weeks and they don't die as long as it is not too wet.

For the most part, I just buy them (available year 'round a block away for $1.99 for 13 big ones) but in late spring on a warm rainy night, they are all over my street and driveway, ready to be picked up. Lucky I guess.

Still trying to figure out why they are called "Canadian" night crawlers. They are native to Europe, NOT North America... plain and simple