Definitely try to hit 1 a weekend during the summer. During the spring a small one started up downtown by the GW/Foggy Bottom metro and I got some great lettuce there.

Closer to my house there are multiple ones on the weekends in different locations. I've had awesome peaches, blackberries, raspberries, blueberries, nectarines, corn, lamb sausage, kielbasa, tomatoes, basil, fresh made mozzarella, lettuce, scallions, green beans, apples and potatoes.

Right now is definitely peach season and they are delicious.