How do you store tulip bulbs?

Clean them well, let them dry for a few days and then put them in a box or paper envelope (something breathable). Label the box carefully, so that you can tell which is which in the spring. Store them in a cold place, like the garage or refrigerator. I don't believe they need to freeze, but they do need to get cold.

You might not actually need to dig your bulbs. Check your zone. They may be able to overwinter in the ground.