The Garden Bug: Winter Composing
By Brenda Weaver
Maintaining an outdoor compost pile through winter months will produce fertilizer for planting in the spring, and can act as a secondary heat source for a greenhouse. To keep compost active over winter, feed it the right balance of green (nitrogen) and brown (carbon) ingredients. Green scraps will be produced in your kitchen over the winter, but most of the brown matter such as dried leaves, straw and plant debris will have been produced in the fall. Gather these types of materials bag them and store them in a dry place near your compost, so you can balance the green scraps that are added through the winter.
Source: learn.eartheasy.com