Bruce, I haven't raised them but have had them establish around our house. That shows that they have a great deal of cold tolerance. This is inspite of studies showing that there were no native worms this far north.
Red wigglers seem to do well with rabbit, sheep and cattle manure but not hog manure. You might be able to dig a trench, line it with a tarp and fill it with manure. Add worms and cover with leaves. To all of this, you have to make something to keep out mice or other things that might eat the worms.
