20 lb box Vidalia onions. The Original Sweet Onion only from Georgia. In Georgia, we’re very proud of our famous seasonal treat (season is from late April through mid September). We’ve come a long way since the accidental discovery of the Vidalia onion variety in the 1930s. While still hand planted and hand harvested, you no longer have to travel to South Georgia each spring and summer to purchase this flavorful, mild onion.