1) It's not too early to start thinking about what you want to plant and where. Tomatoes take a lot out of the soil, so if you've grown them in the same spot for the last two years, it's best to find a new spot - or give them a rest for a year. If you want to participate in a community garden, start sussing that out now. Spaces fill up quickly!
2) if you're going to grow vegetables and spices from seed, start getting your goods together now. You'll need a heating mat, containers, soil....and seeds. Participating in a local seed exchange is a great way to get a wide variety of seeds, and find other like minded local folk who are interested in gardening. Check out http://seedswapday.blogspot.com/ to find a seed swap near you!
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4) Mark the Rooting DC event on your calendar! This year's event will be held on Saturday, February, 18 from 9am to 4pm at Wilson High School at 3950 Chesapeake St NW and very near the Tenleytown Metro. They offer wonderful workshops and resources on gardening and greening in DC.
Be green. Live local. Persevere!