National Washington Day2026 · Date · History
National Day Calendar lists National Washington Day on May 10 as a private Washington State observance; U.S. Senate records statehood on November 11, 1889, and Washington state sources document current government-to-government relations with 29 federally recognized Tribes. Washington’s Birthday/Presidents’ Day is a separate federal identity.
About National Washington Day
National Washington Day is a private observance in National Day Calendar’s National State Days series, observed on May 10.
It is separate from the statehood/admission anniversary of November 11, 1889 and should not be presented as a government-created holiday unless a separate official instrument is specifically cited.
Why National Washington Day matters
In interpreting National Washington Day, the day can be used to explore the state’s communities, places, cultures and history while keeping the private calendar identity clear.
Washington currently has 29 federally recognized Tribes; state sources describe a government-to-government relationship and treaty-reserved rights that remain present-day legal and civic realities.
History of National Washington Day
National Day Calendar lists National Washington Day on May 10 and documents the National State Days series as a private calendar project that began rolling out in 2017.
Federal historical sources record the statehood/admission date as November 11, 1889.
For National Washington Day, the private National Day Calendar date and the statehood/admission anniversary are separate identities and should not be merged.
The name National Washington Day refers to Washington State in this private series and should not be conflated with the federal Washington’s Birthday holiday commonly called Presidents’ Day.
How the observance developed
This timeline uses documented milestones from reviewed sources. Missing stages are left out rather than guessed.
National Day Calendar
National Day Calendar documents the National State Days series as its private observance project.
National Day Calendar
The private National Washington Day identity is creator-defined; state government is not asserted as the original establishing body.
National Day Calendar
National Day Calendar continues to publish National Washington Day on May 10.
What the evidence establishes
Confirmed institutional roles and milestones are shown first. Details that could not be established from the reviewed sources are listed separately below.
5 fields not established in reviewed sources
Also known as
National Washington Day
How to Observe National Washington Day
When learning about National Washington Day, explore state and local history through Tribal, government, museum, library and archive sources.
When learning about National Washington Day, include Indigenous histories and living Tribal/Native governments rather than beginning the story at U.S. statehood.
When learning about National Washington Day, describe the private calendar observance accurately and keep statehood or official legal observances under their own names and dates.
When learning about National Washington Day, use source-bounded language for contested or painful historical events and avoid stereotypes.
National Washington Day Facts
National Day Calendar places National Washington Day on May 10.
National Washington Day appears in the National Day Calendar state-day series, which the publisher says began in 2017.
The statehood/admission date is November 11, 1889.
For National Washington Day, Washington currently has 29 federally recognized Tribes; state sources describe a government-to-government relationship and treaty-reserved rights that remain present-day legal and civic realities.
Topic and context
What this page does not assume
- Keep the source-defined country, community, organizer or institutional scope; do not silently broaden it.
- Do not treat the title alone as proof of government recognition or public-holiday status.
- Do not add a creator, founding story or origin claim unless the supporting evidence establishes it.
- Remembrance Civic Context Care.
Evidence & sources
Sources used across the guide are gathered here. Labels show how each source supports the page, and contextual references are kept separate from primary evidence.
U.S. Senate — Washington state history
Washington Department of Ecology — Tribal relations
Washington Governor’s Office of Indian Affairs — Centennial Accord and current Tribal FAQ
National Day Calendar — National Washington Day (opens in a new tab)
Creator Observance Registry
U.S. Senate — Washington state history (opens in a new tab)
Federal Legislative History
Washington Department of Ecology — Tribal relations (opens in a new tab)
State Government Tribal Context
Washington Governor’s Office of Indian Affairs — current Tribal FAQ (opens in a new tab)
State Government Tribal Context
Washington Governor’s Office of Indian Affairs — Centennial Accord (opens in a new tab)
Understand it, compare it, then explore further
Start with the most common factual questions, then compare closely related observances and explore useful connections.
Frequently asked questions
When is National Washington Day?
10 May The documented recurrence rule is: 10 May under the National Day Calendar National State Days series..
Does National Washington Day fall on the same date every year?
Yes. It uses a fixed annual date unless stronger evidence changes the pattern.
Is National Washington Day an official public holiday?
The reviewed sources verify it within this scope: United States / National Day Calendar National State Days series — Washington. That recognition does not by itself make it a statutory public holiday; the site only makes public-holiday claims when reliable evidence explicitly does so.
Who established or recognizes National Washington Day?
The reviewed sources identify National Day Calendar as the proclaiming or establishing body. Current facilitation or coordination is recorded as National Day Calendar.
Is National Washington Day international or country-specific?
This observance is specific to United States. Its fuller verified scope is: United States / National Day Calendar National State Days series — Washington.
How is this page verified?
The factual information is checked against reviewed sources, including the date pattern, scope and institutional history. This page was checked on 2026-09-26.
When is National Washington Day?
National Day Calendar places the private observance on May 10.
Is that the statehood anniversary?
No. The statehood/admission date is November 11, 1889.
Is National Washington Day a government-created holiday?
The reviewed origin evidence supports a private National Day Calendar observance. Any later government recognition or similarly named legal observance must be treated separately.
How should Indigenous history be handled?
Use current Tribal/government sources and describe living sovereign or recognized communities as present-day governments and peoples, not only as historical background.
Is National Washington Day the same as Washington’s Birthday or Presidents’ Day?
No. This private May 10 observance concerns Washington State; the federal Washington’s Birthday holiday is a different identity.
Other observances on May 10
These observances are also listed on May 10, 2027.
Día de las Madres in Mexico
Mexico’s National Population Council documents Día de las Madres on May 10 and traces the Mexican commemoration to 1922.
FSM Constitution Day
The FSM Government’s Constitution Day messages identify May 10 with the coming into force of the Constitution in 1979 and continue to mark FSM Constitution Day in current government communi…
International Day of Argania
A/RES/75/262
National Independence Day of Romania (Ziua Independenței Naționale a României)
A 2026 Romanian prefecture notice states that, following Law 189/2021, the Romanian state has commemorated National Independence Day every year on 10 May since 2022.
National Shrimp Day
ANFP chapter calendars and Seafood Nutrition Partnership material independently identify May 10 as National Shrimp Day.
National Women’s Checkup Day
A 2026 New York Senate resolution identifies National Women’s Checkup Day as held annually on the second Monday in May and recognizes May 11, 2026 in conjunction with the observance.