- Constitution Day 2026 is observed on Thursday, September 17, 2026 — 239 years after the U.S. Constitution was signed in 1787.
- It is also Citizenship Day, honoring everyone who has become a U.S. citizen by birth or naturalization.
- The modern observance dates to a 2004 law requiring schools receiving federal funds to teach about the Constitution every September 17.
- It kicks off Constitution Week (September 17–23), when tens of thousands of new citizens take the Oath of Allegiance across America.
While much of America is searching for cheeseburger deals this week, another September observance is quietly trending across the United States: Constitution Day 2026. Every September 17, Americans pause to remember the day their founding document was signed — and in 2026, the anniversary carries extra weight, arriving in the year of America’s 250th birthday. Here is everything to know about the date, the history, and how the country celebrates.
When Is Constitution Day 2026?
Constitution Day 2026 is observed on Thursday, September 17, 2026. The date never moves: it is always September 17, the anniversary of the day in 1787 when delegates to the Constitutional Convention signed the United States Constitution in Philadelphia. This year’s observance marks 239 years since that signing — and it opens Constitution Week, which runs through September 23.
What Is Constitution Day and Citizenship Day?
Constitution Day and Citizenship Day is an American federal observance with a double meaning. It commemorates the formation and signing of the United States Constitution on September 17, 1787, and it recognizes all who have become U.S. citizens — whether by birth or by naturalization. In other words, it honors both the document and the people it belongs to.
It is not a federal public holiday — government offices and most businesses stay open — but it is an official day of observance, and for schools and federal agencies it comes with real obligations, as we will see below.
The History of Constitution Day: From 1787 to Today
September 17, 1787: The Signing in Philadelphia
The story begins in the Pennsylvania State House — now known as Independence Hall — in Philadelphia. After four months of heated debate through a sweltering summer, 39 of the 55 delegates to the Constitutional Convention put their names to the new Constitution on September 17, 1787. The document they signed created a federal republic with separated powers, checks and balances, and a Bill of Rights that would follow in 1791 — and it remains the oldest written national constitution still in use anywhere in the world.
1861–1940: The First Commemorations
According to Congress.gov, commemorations of the signing date back as far as 1861. But the first official nationwide recognition came in 1940, when Congress designated the third Sunday of May as “I Am An American Day” — a day to recognize new citizens.
1952: Citizenship Day Moves to September 17
In 1952, Congress moved the observance to September 17 and renamed it Citizenship Day, tying the celebration of citizenship directly to the anniversary of the Constitution’s signing. For the next half-century, that was its official name.
2004: Constitution Day and Citizenship Day
The modern holiday arrived in 2004, when Senator Robert Byrd of West Virginia added an amendment to an omnibus spending bill. Congress renamed the day “Constitution Day and Citizenship Day” and added two requirements: the head of every federal agency must provide employees with educational materials about the Constitution on September 17, and every educational institution receiving federal funds must hold a program about the U.S. Constitution for its students each September 17. That single provision turned the observance into one of the most widely taught civic moments in American schools.
Why Constitution Day 2026 Is Extra Special
Two anniversaries make this year’s observance stand out. First, 2026 marks 239 years since the 1787 signing — the last Constitution Day before the 240th milestone. Second, and bigger: 2026 is the year of America’s 250th birthday, the semiquincentennial of the Declaration of Independence (1776–2026). Every civic anniversary in 2026 is being celebrated with unusual energy, and Constitution Day sits right at the heart of that national birthday season — a reminder that the Constitution was the document that turned independence into a lasting republic.
How America Celebrates Constitution Day
Naturalization Ceremonies Across the Country
The most moving Constitution Day tradition belongs to America’s newest citizens. Each year, U.S. Citizenship and Immigration Services holds roughly 240 naturalization ceremonies during Constitution Week, welcoming tens of thousands of new Americans as they take the Oath of Allegiance. In past years, more than 38,000 candidates have become citizens during the weeklong observance, with ceremonies staged everywhere from the National Archives Rotunda in Washington, D.C., to national park sites across the country. In 2026, universities are joining in too — the University of North Dakota, for example, is hosting a naturalization ceremony for 49 citizenship candidates from 25 countries on its campus.
Classrooms Teach the Constitution
Thanks to the 2004 law, September 17 is a school day with a mission. Public schools, colleges, and universities receiving federal funds hold special programs — lessons on the framers, readings of the Preamble, debates on the Bill of Rights, and quizzes on the three branches of government. For millions of students, it is their deepest single-day dive into how American democracy works.
Constitution Week: September 17–23
Constitution Day opens Constitution Week, observed every year from September 17 through September 23. Civic groups, libraries, and historical societies host lectures, exhibits, and bell-ringing ceremonies — a tradition in which bells ring across the country at the hour the Constitution was signed.
Visits to Historic Sites
Philadelphia takes center stage: Independence Hall and the National Constitution Center draw visitors all week, while the National Archives in Washington displays the original engrossed Constitution. Many sites offer free or special programming around the anniversary.
7 Fascinating Facts About the U.S. Constitution
- It is the world’s oldest written national constitution still in use — in force for 239 years and counting.
- The Constitution has just seven articles and has been amended only 27 times since 1789.
- The famous opening words — “We the People of the United States” — were written larger than anything else on the page so they could be read across the room.
- 39 delegates signed it, but some famous founders did not: Thomas Jefferson and John Adams were overseas, and Patrick Henry refused to attend the convention.
- It took nearly a year to ratify — the ninth state, New Hampshire, approved it on June 21, 1788, putting it into effect.
- The original document is 4,543 words long — shorter than most modern articles about it.
- The Bill of Rights (the first 10 amendments) was added in 1791 to guarantee freedoms like speech, religion, and due process.
How You Can Observe Constitution Day 2026
- Read the Constitution. At 4,543 words, you can read the whole thing in about 30 minutes — the National Archives has it free online.
- Attend a naturalization ceremony. Many are open to the public and are genuinely moving civic events.
- Visit a historic site or exhibit during Constitution Week (September 17–23).
- Quiz your family on the three branches of government or the Bill of Rights over dinner.
- Teachers and parents: free lesson plans and activities are published every year by the National Constitution Center and the U.S. Department of Education.
- Pair it with the week’s lighter side — September is packed with food holidays too, like National Cheeseburger Day on September 18.
Frequently Asked Questions
When is Constitution Day 2026?
Constitution Day 2026 is on Thursday, September 17, 2026 — the 239th anniversary of the signing of the U.S. Constitution in 1787.
Is Constitution Day a federal holiday?
No. It is a federal observance, not a public holiday — government offices, schools, and businesses remain open. Its significance comes from the educational programs and citizenship ceremonies held nationwide.
What is the difference between Constitution Day and Citizenship Day?
They are the same day. The official name since 2004 is “Constitution Day and Citizenship Day”: the first half honors the signing of the Constitution, the second honors all U.S. citizens, including newly naturalized Americans.
Why do schools celebrate Constitution Day?
A 2004 federal law requires every educational institution receiving federal funds to hold an educational program about the U.S. Constitution on September 17 each year. Federal agencies must also provide Constitution education materials to their employees.
What is Constitution Week?
Constitution Week runs from September 17 to September 23 every year. It begins on Constitution Day and includes naturalization ceremonies, bell-ringing, lectures, and exhibits celebrating the Constitution and American citizenship.
How old is the U.S. Constitution in 2026?
The Constitution was signed on September 17, 1787, making it 239 years old in 2026 — and it remains the oldest written national constitution still in use in the world.
The Bottom Line
Constitution Day 2026, observed Thursday, September 17, is far more than a date on the calendar. It marks 239 years since 39 delegates signed a 4,543-word document in Philadelphia that still governs the world’s oldest constitutional republic — and it honors every American, from eighth-generation citizens to the tens of thousands taking the Oath of Allegiance this very week. In America’s 250th birthday year, there may be no better moment to read the Constitution, attend a ceremony, or simply reflect on what “We the People” still means. Happy Constitution Day — and happy Constitution Week.