Composting is a four season event.
Spring: In the Spring you can take out the composted materials out of the bin for Spring planting and kick start the compost pile or bin with soil to get the microbes, worms and other organisms in the pile to decompose the waste materials.
Summer: Keep adding to the compost pile and continue to stir the bin making sure to keep dry material on top and the rest of the materials moist like a dampened sponge.
Fall: Harvest the compost bin and take out all of the composted materials. Add this rich compost material to your gardens and till into that soil.
Winter: The compost bin may still be added to all winter long. It does decompose slower but will compost through the winter and in the spring that process will speed up for spring usage.