October 13, 2026, is the 286th day of the year, with 79 days remaining, and it falls on a Tuesday in the forty-second week of the year. It’s also the second Tuesday of October, which brings Ada Lovelace Day, Face Your Fears Day, and Own Business Day onto the same date.
With 17 national and international days on the calendar, October 13 mixes science, sweets, and a little self-improvement. Ada Lovelace Day celebrates women in STEM and the woman often credited with writing the first computer program. The U.S. Navy turns 251, International Day for Failure invites everyone to treat setbacks as lessons, and World Thrombosis Day honors the physician Rudolf Virchow, who was born on this date in 1821. National M&M Day brings candy to the mix, and National Yorkshire Pudding Day brings the gravy.
National Days on October 13
All national & international days celebrated today
17 celebrations on this day Day 286 of 365 · 79 days left · week 42 · Libra season · 🌒 waxing crescentAda Lovelace Day
Celebrates women in STEM and honors Ada Lovelace, whose 1843 notes contain what is often called the first computer program.
U.S. Navy’s 251st Birthday
On this date in 1775 the Continental Congress authorized the first armed ships that grew into the U.S. Navy.
International Day for Failure
Started by Finnish students in 2010, it encourages people to talk openly about setbacks and what they learned from them.
National M&M Day
Honors the candy-coated chocolates patented in 1941, named for Mars and Murrie, the two men behind them.
Here’s the story behind every celebration on October 13, from the first computer program to a handful of M&M’s.
National & International Days on October 13
Below is a list of all 17 national and international days taking place on October 13, each with a brief explanation.
Ada Lovelace Day
Ada Lovelace Day* (Second Tuesday in October) honors the achievements of women in science, technology, engineering, and mathematics (STEM) and aims to inspire future generations to follow in their footsteps. The observance began in 2009, when Suw Charman-Anderson pledged to spotlight women in technology by encouraging people to write about female innovators they admired. Named after Ada Lovelace, the 19th-century mathematician often regarded as the world’s first computer programmer, the day has grown from a blogging initiative into a global celebration with talks, workshops, and community events. Its purpose is to recognize women’s contributions, challenge stereotypes, and ensure girls see real role models in fields where representation still lags behind.
International Day for Disaster Risk Reduction
International Day for Disaster Risk Reduction / Disaster Day was established in 1989 when the United Nations General Assembly adopted Resolution A/RES/44/236, calling for a global effort to build awareness and reduce the impact of disasters. First observed in 1990 as the International Day for Natural Disaster Reduction, the day promotes understanding of how preparedness, planning, and resilience can save lives and protect communities worldwide. Use hashtags #DRRday and #AreYouReady24 to spread awareness.
International Day for Failure
International Day for Failure began in Finland in 2010 when university students launched an initiative to change how people view failure. Their goal was to promote entrepreneurship by showing that failure is a natural part of learning and growth, not a reason for shame. The observance encourages individuals to share their experiences, reflect on lessons learned, and see setbacks as steps toward improvement. By reducing the fear of making mistakes, it inspires creativity, innovation, and the courage to try again. What started as a Finnish student project has since gained global recognition, spreading a powerful message that progress often begins with failure.
International Plain Language Day
International Plain Language Day has been celebrated every year since Cheryl Stephens and Kate Harrison-Whiteside started it in 2011. The day encourages businesses, organizations, and governments to write in clear, simple language so readers can quickly find, understand, and use the information they need. It also ties into the UN’s Sustainable Development Goal #10, since plain language helps reduce inequality by making information accessible to everyone.
International Skeptics Day
International Skeptics Day, founded in 1996 by eventologist Adrienne Sioux Koopersmith, encourages critical thinking and the questioning of superstition, pseudoscience, and unfounded claims. Though unofficial, the observance gained popularity as an effort to promote evidence-based reasoning and open-minded inquiry. It is most often celebrated on Friday the 13th, a date long linked to bad luck, and sometimes on Election Day, when skepticism about political choices often runs high. The day reminds people that true skepticism is not cynicism—it’s a balanced, curious approach to understanding the world through logic, research, and verifiable facts.
International Suit Up Day
International Suit Up Day is a fan-made holiday inspired by Barney Stinson, the suit-obsessed character from How I Met Your Mother whose famous catchphrase was “Suit up!” Fans have celebrated it since 2010 by wearing a suit for the entire day, whether they’re heading to the office, the grocery store, or just lounging at home. It’s a lighthearted way to honor the show and to feel a little more polished and confident for a day.
Metastatic Breast Cancer Awareness Day
Metastatic Breast Cancer Awareness Day shines a light on those living with Stage IV breast cancer and calls for more research, awareness, and support. It was established in 2009, when the Metastatic Breast Cancer Network (MBCN) and patient advocates successfully urged Congress to recognize the day through unanimous resolutions. Unlike early-stage breast cancer, metastatic breast cancer means the disease has spread to other parts of the body and is not considered curable, making ongoing treatment and research vital. The observance highlights the need for better funding, understanding, and compassion for those affected, while honoring the strength and advocacy of the patients and families who continue to push for progress.
National Face Your Fears Day
National Face Your Fears Day* (Second Tuesday in October) created in 2007 by public speaker Steve Hughes, founder of the Hit Your Stride website, encourages people to confront the fears that hold them back. Although sources differ on the exact date—some place it on the second Tuesday in October, others on the third—the message stays the same: courage grows when we face what scares us. The day serves as a reminder that fear often loses its power once it’s acknowledged and challenged. Whether it’s speaking in public, trying something new, or addressing a personal challenge, this observance invites everyone to take one brave step toward greater confidence and self-discovery.
National Herpes Awareness Day
National Herpes Awareness Day aims to reduce stigma and promote honest, informed conversations about herpes and its impact on millions of people worldwide. Although its exact origins are unclear, the day plays an important role in public health education. It reminds people that herpes is a common condition, often undiagnosed, and that shame or misinformation can prevent individuals from seeking treatment. By encouraging open discussion, the observance supports better understanding, compassion, and access to care.
National M&M’s Day
National M&M’s Day honors one of America’s most iconic candies. Although the exact origin of the observance is unclear, it appears to have begun as a fan-created celebration, with the first known mention dating to 1996. The date links back to the 1941 patent filing by Forrest Mars Sr. and Bruce Murrie, who created M&M’s as candy-coated chocolate that wouldn’t melt in soldiers’ hands. Over time, Mars, Inc. embraced the day with promotions and events, turning it into a popular annual celebration.
National No Bra Day
National No Bra Day raises awareness about breast cancer, promotes early detection, and supports those affected by the disease. The observance began in 2011, combining two separate efforts: a July 9 online campaign by “Anastasia Doughnuts” to spread breast cancer awareness, and Dr. Mitchell Brown’s Breast Reconstruction Awareness (BRA) Day, founded in Toronto that same year to educate women about post-mastectomy reconstruction options. The date was later moved to align with Breast Cancer Awareness Month. Today, the day encourages women to skip wearing a bra as a symbolic gesture of support for survivors, body confidence, and health awareness. While some view the observance as controversial, many see it as a creative way to start conversations about breast health, self-exams, and ongoing research for a cure.
National Train Your Brain Day
National Train Your Brain Day encourages people to keep their minds active and engaged through fun, challenging activities. The day reminds us that mental fitness is just as important as physical fitness. Simple habits like solving puzzles, reading, playing strategy games, or learning something new help strengthen memory and focus. Even small efforts—like trying a new hobby or tackling a tricky problem—can boost mental sharpness and keep the brain healthy throughout life.
National Transfer Money to Your Son Day
National Transfer Money to Your Son Day was created in 2009 to give parents a fun and thoughtful way to show appreciation for their sons—often through a small financial gift. Coming one week after National Transfer Money to Your Daughter Day (October 6), it recognizes the value of family support and the bond between parents and sons.
National Yorkshire Pudding Day
National Yorkshire Pudding Day pays tribute to the classic British dish known for its golden, crisp edges and soft, airy center. While the observance began in the UK in 2008 (where it’s marked on the first Sunday in February), the American version likely grew from food lovers and online communities eager to share this comfort food tradition. Yorkshire pudding—a simple mix of eggs, flour, and milk baked to perfection—is often enjoyed with roast beef and gravy. The day invites home cooks to try making it themselves, share recipes, and celebrate a delicious piece of British heritage that has found fans around the world.
Own Business Day
Own Business Day / I Own My Own Business Day* (Second Tuesday in October) was founded in 2016 by METRO to spotlight and support independent business owners around the world. The day encourages entrepreneurs to share their stories, services, and special offers, helping them gain visibility in their communities and online. It also reminds customers how important small, local businesses are to everyday life—from neighborhood cafés and family shops to service providers and artisans.
U.S. Navy Birthday
The U.S. Navy’s birthday on Tuesday, October 13, 2026, marks 251 years since the Continental Congress authorized the first armed vessels to challenge British supply ships during the American Revolution in 1775. Sailors, veterans, and supporters around the world celebrate with ceremonies, Navy birthday balls, and traditional cake cutting, often with the oldest and youngest sailors present sharing the first slice. The day honors the Navy’s long history of service at sea and the people who have served in it.
World Thrombosis Day
World Thrombosis Day was established in 2014 by the International Society on Thrombosis and Haemostasis (ISTH) to raise global awareness about thrombosis—blood clots that can lead to serious or fatal conditions. The date honors Rudolf Virchow, a 19th-century pathologist whose research formed the foundation for understanding thrombosis. The campaign educates the public and healthcare professionals about risk factors, warning signs, and prevention methods, emphasizing that most blood clots are preventable. Through education, lifestyle awareness, and better medical guidance, World Thrombosis Day seeks to reduce deaths and disabilities caused by this often silent but dangerous condition.
Jump to
National Days in October
