Got an idea for a holiday? Send it to us

Submit Now

TueApr 1

National Sourdough Bread Day – April 1, 2025

National Sourdough Bread Day is an annual event celebrated on April 1 to honor the long history of sourdough bread-making. The often crusty loaf, with a chewy bite and sharp acidulated tang, is considered to be one of the most unique tasting breads available.

Did you know French bakers were responsible for introducing the fermentation process that gives the bread its distinct sour taste in North America? The process of making sourdough bread was first imported into northern California during the Gold Rush before spreading through the country, following the success of the commercial production of a special yeast for it after French chemist and microbiologist Louis Pasteur discovered the microorganisms that cause fermentation and gives the bread its taste.

History of National Sourdough Bread Day

Sourdough bread-making history can be traced back to the gold rush of the 1800s that brought an onrush of miners to California — including their family members who are bakers from countries around the world. Local lore attributed the bread to Basque migrants from the Pyrenees who arrived in San Francisco during the gold rush.

The bread is traditionally produced through the fermentation of the dough using lactobacilli and yeasts. In a typical production of sourdough bread, these lactobacilli outnumber yeasts by a ratio of 100 to one and cause it to produce the acids that give the bread its tartness.

It starts when an ecosystem begins to form as flour mixes with water to make a starter dough. Enzymes in the flour split starches into sugars, and the bacteria convert these sugars into lactic and acetic acid as the dough begins to go down in pH level. Most microorganisms die out at this point. Before yeasts start to convert sugars into carbon dioxide and ethanol, which is often followed by gas bubbles and fruity fermentation smells that signal, it’s ready to be baked.

Sourdough is considered traditional San Francisco bread, and it’s still a part of the state’s culture today. In fact, its deep-rooted history can be seen in the alias of San Francisco 49ers’ mascot nicknamed ‘Sourdough Sam.’

The bread was so common during the Gold Rush that the word ‘sourdough’ became the alias for gold prospectors. Its popularity also remains today as it remains a staple on the menu of many of the state’s restaurants.

National Sourdough Bread Day timeline

3700 B.C.
Oldest Known Sourdough Bread Found

One of the oldest sourdough breads is excavated in Switzerland.

Louis Pasteur Uncovers Sourdough

Pasteur — a French chemist and microbiologist, shows that fermentation is caused by microbes like Lactobacilli.

Sourdough Technique Imported

French bakers bring sourdough techniques to Northern California during the California Gold Rush.

Sourdough Fermentation is Replaced

Sourdough is the main form of leavening in Europe in the Middle Ages until it is replaced by barm.

National Sourdough Bread Day FAQs

Why is sourdough bread suddenly so popular?

Sourdough bread has always been popular. Perhaps one factor helping to make it even more popular in country regions is how its fermentation process produces gas bubbles and fruity smells many consider heavenly.

Is sourdough bread good for weight loss?

Possibly. Sourdough bread has health benefits due to its fermentation process, and the friendly sugar-eating bacteria in them means eating them over regular bread may help with weight loss.

How can I celebrate National Sourdough Bread Day?

Experiment with a recipe for making Sourdough bread to celebrate the holiday. The goal of the day is to get everyone to enjoy the unique taste of the bread so, eat it.

National Sourdough Bread Day Activities

  1. Make Sourdough bread

    There’s no better way to celebrate National Sourdough Bread Day than to bake sourdough bread. If you’re new, search for recipes and follow baking instructions found in online food blogs and forums. You may even combine several recipes into one unique and distinct sourdough bread recipe for your sole amusement and experimentation.

  2. Donate to a food pantry

    If you’re convinced you’ve made the most unique homemade sourdough bread, you will most likely want to share it with friends and family and maybe even neighbors. So we encourage you to observe National Sourdough Bread Day like a few others by donating your bread to local food pantries. It’s one of the most impactful ways to honor the savory bread and celebrate the holiday.

  3. Share your recipe on social media

    Share your unique homemade sourdough bread recipe with friends online as a way to celebrate the holiday and encourage more people to try out the bread! Tag specific food platforms and popular bakeries and use #SourdoughBreadDay to post on social media to persuade them to start a conversation around your recipe or the practice of sourdough bread-making.

5 Important Facts About Sourdough Bread

  1. Its signatures sour taste and microbes

    Sourdough’s signature sour taste is a result of the fermentation of dough using Lactobacilli bacteria and yeast.

  2. It’s perfect for diabetic patients

    Sourdough is a low–glycemic food that helps to keep blood sugar levels in control.

  3. It does not require preservatives

    Sourdough bread’s fermentation process means it requires no preservative to help its shelf life.

  4. Sourdough, yogurt, and cheese

    The lactobacilli bacteria that gives Sourdough its sour taste is cousins to the bacteria found in yogurt and cheese.

  5. Lactobacilli bacteria makes it last longer

    Microbiologists believe lactobacilli bacteria also help sourdough bread have a longer shelf life.

Why We Love National Sourdough Bread Day

  1. Its tangy taste

    National Sourdough Bread Day serves as a day to enjoy the often crusty and chewy bread with a sharp acidulated tang. We love the after-effect it leaves in our mouths. It’s sweet and savory for sure!

  2. Its long history

    We love the story of the origin of sourdough bread! The practice of making Sourdough is as ancient as that of bread-making itself. Dating back more than 5,000 years. Its introduction into the culinary menu of the new world during the gold rush era in California also means it holds a significant place in our hearts. National Sourdough Bread Day reminds us of this history.

  3. Sourdough bread is fun to make

    If there’s only one reason to give for why we love celebrating National Sourdough Bread Day, this is it! There’s no doubt that even the most delicious meals would make for a dull day in the kitchen if its recipe does not lend itself to experiments that bring fun into cooking. Sourdough bread is fun to make because of its recipe and fermentation process, and we love it. Naturally, this makes us want to celebrate National Sourdough Bread Day often.

National Sourdough Bread Day dates

2025April 1Tuesday
2026April 1Wednesday
2027April 1Thursday
2028April 1Saturday
2029April 1Sunday
Be Kind to Spiders Week
Golden Rule Week
International Pooper Scooper Week
Laugh at Work Week
Medication Safety Week
Testicular Cancer Awareness Week
April Fools' Day
Assyrian New Year
Boomer Bonus Days
Cyprus National Holiday
Edible Book Day
Fossil Fools Day
International Fun at Work Day
International Tatting Day
Library Snap Shot Day
Lupus Alert Day
Mathematics and Statistics Awareness Month
Myles Day
National Connor Day
National Fun Day
National Greeting Card Day
National Loyal Day
National One Cent Day
National Sexual Assault Awareness Month's Day of Action
National Sourdough Bread Day
National Trombone Players Day
Nickelodeon Anniversary Celebration Day
Odisha Day
Reading is Funny Day
SAAM Day of Action
St. Stupid Day
Take Down Tobacco National Day of Action
U.S. Air Force Academy Day
U.S. Air Force Academy Day
Adopt a Ferret Month
Adopt a Greyhound Month
Arab American Heritage Month
Autism Acceptance Month
Bowel Cancer Awareness Month
Brussels Sprouts and Cabbage Month
Cancer Control Month
Canine Fitness Month
Celebrate Diversity Month
Cesarean Awareness Month
Child Abuse Awareness Month
Children and Nature Awareness Month
Counseling Awareness Month
Couple Appreciation Month
Cranberries and Gooseberries Month
Deaf History Month
Defeat Diabetes Month
Distracted Driving Awareness Month
Dog Appreciation Month
Earth Month
Emotional Overeating Awareness Month
Fair Housing Month
Filipino Food Month
Financial Capability Month
Financial Literacy Month
Fresh Florida Tomato Month
Genocide Awareness Month
Global Astronomy Month
Global Child Nutrition Month
Grange Month
Heartworm Awareness Month
IBS Month
Informed Women Month
International Amateur Radio Month
International Customer Loyalty Month
International Guitar Month
Jazz Appreciation Month
Keep America Beautiful Month
Month of the Military Child
Move More Month
Multicultural Communications Month
Multiple Birth Awareness Month
National African-American Women's Fitness Month
National Alcohol Awareness Month
National BLT Sandwich Month
National Car Care Month
National Card and Letter Writing Month
National Decorating Month
National Donate Life Month
National Facial Protection Month
National Food Month
National Foot Health Awareness Month
National Fresh Celery Month
National Frog Month
National Garlic Month
National Grilled Cheese Month
National Humor Month
National Internship Awareness Month
National Kite Month
National Knuckles Down Month
National Literature Month
National Minority Health Month
National Month of Hope
National Pecan Month
National Pest Management Month
National Pet First Aid Awareness Month
National Poetry Month
National Rebuilding Month
National Safe Digging Month
National Sexual Assault Awareness and Prevention Month
National Sexually Transmitted Infections (STIs) Education and Awareness Month
National Sjogren's Syndrome Awareness Month
National Social Security Month
National Soft Pretzel Month
National Soy Foods Month
National Volunteer Month
National Welding Month
National Woodworking Month
National Youth Sports Safety Month
Occupational Therapy Month
Panagyaman Rice Festival
Parkinson's Awareness Month
Parkinson's Awareness Month
Parliamentary Law Month
Pharmacists War on Diabetes Month
Physical Wellness Month
Poetic Earth Month
Prevent Lyme Disease in Dogs Month
Prevention of Cruelty to Animals Month
Primary Immunodeficiency Month
Records and Information Management Month
Records and Information Management Month
Rosacea Awareness Month
Sarcoidosis Awareness Month
School Library Month
Scottish-American Heritage Month
Sexual Assault Awareness Month
Sports Eye Safety Awareness Month
Step up for 30 For Bowel Cancer Month
STI Awareness Month
Straw Hat Month
Stress Awareness Month
Summer Tire Changeover Month
SunSmart Skin Cancer Prevention
Testicular Cancer Awareness Month
Tomatillo and Asian Pear Month
Women's Eye Health and Safety Month
Workplace Conflict Awareness Month
World Autism Month
World Landscape Architecture Month
Worldwide Bereaved Spouses Awareness Month

Holidays Straight to Your Inbox

Every day is a holiday!
Receive fresh holidays directly to your inbox.