National Sisters Day falls on the first Sunday of August, which is August 2 in 2026. It is a floating observance devoted to celebrating the bond between sisters, whether by birth, marriage, or chosen family, and to appreciating the sisterhood in our lives.
When is National Sisters Day?
National Sisters Day is held on the first Sunday of August each year. In 2026 that is August 2, and in 2027 it moves to August 1. Because it is tied to a day of the week rather than a set number, the calendar date shifts slightly from year to year.
History and origin of National Sisters Day
National Sisters Day is commonly attributed to Tricia Eleogram of Tennessee, who is said to have founded it in 1996, in some accounts alongside a friend named Stacey Berry, to celebrate the spirit of sisterhood. That said, the precise origin is not firmly documented by an official authority, so it is honest to describe the founding as widely reported rather than definitively verified. The observance grew through greeting-card traditions, family celebrations, and social media, where people began publicly honoring their sisters each August.
Why National Sisters Day matters
Sisters are often lifelong companions, confidants, and support systems, sharing childhood memories and standing by one another through adulthood. National Sisters Day sets aside a moment to acknowledge those relationships, which can be easy to take for granted amid busy schedules. It also broadens to include the idea of sisterhood more generally, honoring close female friendships and the networks of support women build with one another.
How to celebrate National Sisters Day
- Call or visit your sister to catch up and say thank you.
- Share old photos or memories that celebrate your history together.
- Send a thoughtful card, note, or small meaningful gift.
- Plan a shared activity like a meal, movie, or day trip.
- Reconnect with a sister you have not spoken to in a while.
- Honor the sisterhood in your life by celebrating close friends too.
- Post a tribute on social media with #NationalSistersDay.
Celebrating sisterhood, by blood or by bond
While National Sisters Day started as a tribute to biological sisters, many people now use it to honor sisterhood in a broader sense. Stepsisters, sisters-in-law, and the close female friends who feel like family all fit the spirit of the day. For some, it is a chance to celebrate a support system built outside of blood ties, from lifelong best friends to mentors and chosen family. That flexibility is part of why the day has spread on social media, where people post tributes to the women who have shaped their lives.
Ideas for sisters near and far
Because the day lands in early August, it often coincides with summer travel and family gatherings, making an in-person visit realistic for many. For sisters separated by distance, a phone call, video chat, or a surprise care package can carry the same warmth. Some people mark the day by revisiting shared memories, digging out old photos, or planning a future trip together. Others use it as a nudge to repair a strained relationship or reconnect after a period of drifting apart. However it is observed, the point is intentional appreciation for a relationship that is easy to take for granted.
Related days and observances
Related celebrations include National Siblings Day, National Brothers Day, National Best Friends Day, and Galentine’s Day. Each honors a different close relationship, from family ties to friendship.
Fun facts
National Sisters Day is one of several sibling-focused observances on the U.S. calendar, reflecting how central family relationships are to the way people mark the year. Its summer placement makes it a natural fit for reunions and family gatherings.
In the end, National Sisters Day is a nudge to invest in a relationship that often runs quietly in the background of daily life. Sisters share history, inside jokes, and a kind of shorthand that few other relationships match, and the day sets aside a moment to say so out loud. Whether you spend it together, reach across the miles with a call, or simply send a message of thanks, the first Sunday of August is a gentle reminder not to take that bond for granted.
Frequently Asked Questions
When is National Sisters Day?
It is a floating holiday on the first Sunday of August, which is August 2 in 2026 and August 1 in 2027.
Who started National Sisters Day?
It is often credited to Tricia Eleogram of Tennessee in 1996, but its precise origin is not firmly documented.
Why is it in August?
The summer timing places it when families are more likely to gather and spend time together.
Why do we celebrate National Sisters Day?
To honor the bond, support, and shared history between sisters.
Is National Sisters Day a public holiday?
No. It is an informal observance, not a public or federal holiday.
What is the hashtag for National Sisters Day?
Common tags include #NationalSistersDay and #SistersDay.