National Sourdough Bread Day 2024 Theme. Sourdough september celebrates the world's oldest leavened bread, giving everyone a chance to enjoy this delicious delight the entire month. Today is national sourdough bread day!
On national sourdough bread day, many people celebrate by baking their own sourdough bread or visiting their local bakery to pick up a fresh loaf. Enter, “the maria liberati show,” based on her travels, as well.