National Mustard Day is celebrated on the first Saturday of August, which lands on Saturday, August 1, 2026. It is a spirited food holiday devoted to mustard in every style, from classic yellow to spicy brown, Dijon, and countless artisanal blends, and it is closely tied to a museum built entirely around the condiment.
When is National Mustard Day?
National Mustard Day is a floating observance rather than a fixed date. It always falls on the first Saturday of August, so the exact day shifts each year. In 2026, the first Saturday of August is August 1, so that is when the celebration takes place. Because it moves, it is worth checking the calendar each year rather than assuming a set date.
History and origin of National Mustard Day
National Mustard Day is closely associated with the National Mustard Museum, founded by Barry Levenson, a former assistant attorney general in Wisconsin who turned a growing mustard collection into a museum. The museum, now located in Middleton, Wisconsin, became the sponsor of National Mustard Day in 1991, and the celebration has been held in connection with it ever since. Accounts of the very first event vary slightly, with some sources dating early gatherings to the late 1980s in Levenson’s backyard before the celebration grew and moved to the museum. What is consistent is that the modern observance, with its festival atmosphere, is driven by the museum and has expanded into a popular community street event over the decades. The museum’s own collection grew out of Levenson’s personal passion for mustard, and it eventually relocated from Mount Horeb to Middleton, Wisconsin, where the annual festival now closes downtown streets and draws crowds for a day of mustard-themed fun.
Why National Mustard Day matters
The day matters as a celebration of one of the world’s oldest and most widely used condiments. Mustard has a long culinary and even medicinal history stretching back to antiquity, when its seeds were valued both as a seasoning and as a folk remedy, and it plays a starring role in cuisines around the globe, from tangy American yellow to sharp English mustard, French Dijon, and coarse whole-grain blends. National Mustard Day highlights that diversity, encouraging people to look beyond basic yellow mustard and discover regional and specialty varieties they might never have tried. It also functions as a community gathering, drawing crowds for tastings, food, and family-friendly fun, and it supports a unique institution dedicated to preserving mustard’s history and culture. In short, it turns a humble, inexpensive condiment into a genuine reason to gather and celebrate together.
How to celebrate National Mustard Day
The day is a great excuse to explore a condiment most people take for granted. Here are a few flavorful ways to take part.
- Host a mustard tasting featuring yellow, Dijon, whole-grain, honey, and spicy varieties.
- Add mustard to classic foods like hot dogs, brats, pretzels, and sandwiches.
- Try cooking with mustard in dressings, marinades, or glazes.
- Attend the National Mustard Museum’s festival if you are in the area.
- Explore mustards from different countries and regions.
- Make your own mustard from seeds for a hands-on project.
- Share your favorite mustard pairing online with the day’s hashtag.
Related days and observances
National Mustard Day pairs with other condiment and cookout celebrations, including National Ketchup Day, National Hot Dog Day, National Pretzel Day, and National Sandwich Day. Its summer timing places it right in grilling season, when mustard shows up on hot dogs, brats, and burgers, making it a natural companion to the many barbecue-themed food days that fill the warmer months.
Fun facts
The National Mustard Museum houses thousands of mustards from around the world, one of the largest such collections anywhere. Mustard has been used for both food and folk remedies for thousands of years. And the plant belongs to the same family as cabbage, broccoli, and kale, with the familiar condiment made from its ground seeds. The sharp heat of mustard develops only when the ground seeds are mixed with liquid, which triggers a chemical reaction, so the type of liquid and how long it sits both shape the final flavor. Mustard is also low in calories and fat, which is part of why it is such a popular way to add big flavor to sandwiches and grilled foods.
Frequently Asked Questions
When is National Mustard Day?
It is a floating observance held on the first Saturday of August. In 2026 it falls on August 1.
Who started National Mustard Day?
It is tied to the National Mustard Museum, founded by Barry Levenson, which has sponsored the celebration since the early 1990s.
Why do we celebrate National Mustard Day?
To celebrate mustard as a condiment and to enjoy the museum's community festival of tastings and food.
How do you celebrate National Mustard Day?
Sample different mustards, add mustard to hot dogs and brats, or attend the museum's festival.
Is National Mustard Day a public holiday?
No. It is an unofficial food holiday, not a public or federal holiday.
What is the hashtag for National Mustard Day?
Common tags include #NationalMustardDay and #MustardDay.