Wet a paper towel and squeeze excess water out of it until it's uniformly moist, but not dripping.
Sprinkle about 10 to 20 seeds onto the paper towel, making sure they're spread apart and not in clumps.
Roll it up, tightly enough that the seeds are in good contact with the towel, but it doesn't have to be super tight.
Fold and place in a plastic bag, secure it shut and store at room temperature. Every two or three days, check to see if the seeds are beginning to sprout. If two or three weeks go by and you see no signs of sprouting, you should buy fresh seeds.
Early February is the best month to check the viability of your vegetable seeds in storage. Cold-weather transplants to your vegetable garden will need to be started indoors right away and you'll want to start your inside warm-weather transplants in March.