I came across a nice post at Johnny's about January "garden" tasks.
Get the greenhouse ready. I don't have a greenhouse, but the wonderful thought of working in the sun in the middle of the winter makes me wish for one: "The ideal way to spend a sunny day in winter? Go to the greenhouse and soak up some Vitamin D while you get organized for transplant production. Your goal is to inspect, clean, repair, and take inventory." Rather than a greenhouse, I'm getting my plant lights and shelves ready in the sunniest window of my house.
Inventory your seeds. I'm also going through my old seeds before I order more. This is the number of years you can expect old seeds to stay viable:
* 1 year: onions, parsnips, parsley, salsify, and spinach;
* 2 years: corn, peas, beans, chives, okra, dandelion;
* 3 years: carrots, leeks, asparagus, turnips, rutabagas;
* 4 years: peppers, chard, pumpkins, squash, watermelons, basil, artichokes;
* 5 years: most brassicas, beets, tomatoes, eggplant, cucumbers, muskmelons, celery, celeriac, lettuce, endive, chicory.
As I go through the old packets, I'm putting together a variety list so I can start keeping track of what does well for me.