Joanne McKinnon Garden Photography

In my zone, composting outdoors is impossible during winter months. Vermicomposting works differently. Some worm bin systems can be used year round and work both indoors and out. All you need is a well ventilated spot that doesn’t get colder than 4°C ( 40F) or hotter than 26°C (80F).
You can order worms or eggs from: Gardener’s Supply Company

There is an excellent video on Fine Gardening about Worm composting

Worms Eat My Garbage: 2nd Edition