For fall planting in Atlantic Canada, you want to wait until after a killing frost, meaning nothing is left growing from the summer season. If you plant your seeds too early, they may sprout. You want your seeds to hibernate for the winter and emerge in spring. If a fall seedling does sprout, mulch over them to prevent them from freezing.
To plant your seeds:
1. Prepare the bed as you normally would any time of the year
2. Clear all debris and add a layer of organic compost
3. Follow the seed packet for light and soil requirements