National Constitution Day

History & origins

National Constitution Day is listed in this site's 2026 calendar for September 17. Informal "national days" are often promoted by communities, trade groups, and brands; origins and official proclamations vary by country and year. Celebrate the foundation of American democracy on National Constitution Day! Commemorating the signing of the US Constitution on September 17, 1787, this day honors the document that established our government and protects our rights. Because many such observances are cultural or promotional rather than statutory, treat dates as a planning guide and confirm local events separately.

Why it matters

Observing National Constitution Day gives people a shared anchor to explore holiday themes—constitution, civics, September, history, government—and to coordinate learning, gatherings, or giving around that focus. Celebrate the foundation of American democracy on National Constitution Day! Commemorating the signing of the US Constitution on September 17, 1787, this day honors the document that established our government and protects our rights. Learn about constitutional principles and civic responsibility.

How to celebrate

Read the Constitution and Bill of Rights. Visit historical sites like Independence Hall. Participate in citizenship ceremonies. Attend educational programs about constitutional rights. Discuss civic duties with family. Share constitutional knowledge on social media.

Facts

• The Constitution has only 27 amendments in over 230 years
• It's the oldest written national constitution still in use
• The Constitution was written in just 100 working days
• The original document is four pages long
• All federal employees and military personnel must take an oath to uphold it

Upcoming dates

• Thursday, September 17, 2026
• Friday, September 17, 2027
• Sunday, September 17, 2028
• Monday, September 17, 2029
• Tuesday, September 17, 2030