If you’re the kind of person who loves the idea of vermicomposting but can’t quite embrace the thought of keeping worms in your home, you are not alone. Many avid gardeners who know the value of worm castings just don’t feel comfortable having an indoor worm bin. Of course they can buy first class castings from us but, there’s no reason to miss out on creating your own vermicompost. You can worm farm outside. Red worms are really quite temperature tolerant, our facility is outdoors all year round. Manitoba has some of the coldest winter weather in the world, the key for survival is size. Because composting worms are leaf littler worms http://www.naturesperfectplantfood.com/2012/07/17/leaf-litter-worms/ they lack the instinct to burrow under the frost line. If left on their own they will die when frozen. They do however posses the same sence of self-preservation that all living creatures depend on. Red worms will try to flee a hostile environment. If you have a large enough compost heap, (bins don’t seem to work for this) one that’s big enough not to freeze completely, you stand a fairly good chance of over wintering at least some of your colony. http://www.naturesperfectplantfood.com/2011/05/06/conclusive-proof-worms-survive-winter-in-winnipeg/ The best bet is to start in early spring to give your worms time to become established. This is not a short-term plan so be prepared to wait a year or two before beginning to harvest your castings.