This weekend marks the kickoff of market season for Mobile (though I'll miss it, being in New Orleans for a conference. Not exactly a hardship.).
WHERE & WHEN
Market on the Square
Cathedral Square in downtown Mobile
Saturdays, 7:30am - 11:00am
April 26 - July 26
Market in the Park
Mobile Museum of Art parking lot
Thursdays, 3:00pm - 6:30pm
May 1 - July 24
PRODUCTS
Both markets offer seasonally available produce such as tomatoes, potatoes, sweet corn, melons, berries, peppers, citrus (my bad, citrus is only available at the fall market), honey, seafood; flowers, plants; baked goods; and crafts. Live music on most days. The art museum offers free admission coinciding with the Thursday market.
ADDITIONAL INFORMATION
These markets are producer-only markets, meaning that the vendors must personally grow or produce the items that they sell. Resale of items purchased by the vendor is not allowed.
Chris Barrazza, who coordinates the markets for the city, tells me the downtown market has been around for about nine years, and this is the fourth year in its Cathedral Square location. The move, from a nearby parking lot, provided shade, a better public space, and was met with universal approval after a season. The Market in the Park is now in its third year, and will take place only in the spring (as opposed to the Cathedral Square market, which will continue to have a spring and fall season).
The markets participate in the state's Farmers Market Nutrition Programs, which distribute coupons to low-income senior citizens, women, and children. Visit the program web site for more information and eligibility requirements.
Web site: City of Mobile Neighborhood and Community Services

I’ve added a little information to this entry, plus a comment to bump it up.