Last updated: August 31, 2026
When is National Twin Day Dates 2026–2035
| Date | Name | Day | Week | Days left |
|---|---|---|---|---|
| December 18, 2026 | National Twin Day 2026 | Friday | 51 | 108 |
| December 18, 2027 | National Twin Day 2027 | Saturday | 50 | 473 |
| December 18, 2028 | National Twin Day 2028 | Monday | 51 | 839 |
| December 18, 2029 | National Twin Day 2029 | Tuesday | 51 | 1204 |
| December 18, 2030 | National Twin Day 2030 | Wednesday | 51 | 1569 |
| December 18, 2031 | National Twin Day 2031 | Thursday | 51 | 1934 |
| December 18, 2032 | National Twin Day 2032 | Saturday | 51 | 2300 |
| December 18, 2033 | National Twin Day 2033 | Sunday | 50 | 2665 |
| December 18, 2034 | National Twin Day 2034 | Monday | 51 | 3030 |
| December 18, 2035 | National Twin Day 2035 | Tuesday | 51 | 3395 |
Quick Facts:
- Event: National Twin Day
- Date: December 18, 2026
- Hashtag: #NationalTwinDay
- Origin: Proclaimed in 2019 by National Day Calendar® to celebrate twins annually on December 18th.
- Population Statistic: According to the CDC, twins account for approximately 3.4% of the population.
- Famous Real-Life Twins: Astronauts Mark and Scott Kelly, White House twins Barbara and Jenna Bush, Olympic hockey players Jocelyne Lamoureux-Davidson and Monique Lamoureux, and actors James and Oliver Phelps.
- Pop Culture Twins: Phoebe Buffay (*Friends*), Sheldon Cooper (*The Big Bang Theory*), and Fred and George Weasley (*Harry Potter*).
- Different Birthdays Fact: Twins can be born on different days if one is delivered before midnight and the other after, or if medical circumstances require delayed delivery of the second twin.
- How to Observe: Give a shout-out to twins you know, share twin photos, tell favorite twin memories, host a twin party, or use the official hashtag on social media.
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Chokri Hamouda runs Calendarena.com. He makes simple, printable calendar templates. His goal is to help people organize their time better. He updates the site with monthly and yearly calendars for users worldwide. Chokri focuses on making calendars that are easy to read and use. He also researches holidays and date systems to keep everything accurate.