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Evergreen date guide

What is celebrated on March 11?

See the observances and verified observance-history milestones attached to March 11. Each observance keeps its own source and date details.

Verified history

On this date in observance history

Today in history →

Selected observance milestones connected to this date, based on reviewed sources.

2022
First observance

National No-Code Day

Zapier’s launch says the first National No-Code Day would be March 11, 2022; a 2023 Zapier post describes the next edition as the second annual event.

2021
Later action

National Working Moms Day

Proclaimed National Working Moms Day for annual observance on March 12, recognizing and annualizing the Working Moms of Milwaukee-created day.

2010
First observance

World Plumbing Day

The WPC handbook identifies March 11, 2010 as the inaugural World Plumbing Day.

About this date

What this date contains

4 observances

Each observance is shown once in this view, with its own source and scope details available on the guide page.

0 repeat predictably

0 use a fixed annual date and 0 follow a reusable calendar rule.

0 are edition-specific

These dates are shown only for the year or edition that has been confirmed.

3 have a country-specific scope

Country-specific observances are not presented as worldwide events.

4 have in-depth guides

These pages include reviewed meaning, history, activities, facts and FAQs.

Reviewed depth

Other in-depth guides on March 11

Source-backedFixed AnnualIn-depth guide

Moshoeshoe’s Day

11 March annually · Lesotho / national public holiday and remembrance

Lesotho government sources commemorate Moshoeshoe I on 11 March, and the official holiday calendar lists the day as a public holiday. Government history frames 11 March as remembrance of th…

Source-backedFixed AnnualIn-depth guide

National No-Code Day

11 March · United States-origin / Zapier-created no-code technology observance

Zapier states that it launched National No-Code Day as an annual celebration and that it is observed every March 11.

Source-backedRule Based AnnualIn-depth guide

Registered Dietitian Nutritionist Day

Second Wednesday in March annually · United States / Academy of Nutrition and Dietetics professional observance

The Academy of Nutrition and Dietetics states that Registered Dietitian Nutritionist Day is celebrated on the second Wednesday in March during National Nutrition Month.

Source-backedFixed AnnualIn-depth guide

World Plumbing Day

11 March · international plumbing profession and public-health awareness observance led by the World Plumbing Council

World Plumbing Council first-party material verifies March 11, an October 2009 WPC launch, the inaugural March 11, 2010 observance and continuing annual WPC stewardship.

Explore the mix

Topics represented on March 11

All topics →
Workplace, Professions & Appreciation 2Civic, Remembrance & History 1Arts, Entertainment & Lifestyle 1
4 observances

All observances on this date

Source-backedFixed AnnualIn-depth guide

Moshoeshoe’s Day

11 March annually · Lesotho / national public holiday and remembrance

Lesotho government sources commemorate Moshoeshoe I on 11 March, and the official holiday calendar lists the day as a public holiday. Government history frames 11 March as remembrance of th…

Source-backedFixed AnnualIn-depth guide

National No-Code Day

11 March · United States-origin / Zapier-created no-code technology observance

Zapier states that it launched National No-Code Day as an annual celebration and that it is observed every March 11.

Source-backedRule Based AnnualIn-depth guide

Registered Dietitian Nutritionist Day

Second Wednesday in March annually · United States / Academy of Nutrition and Dietetics professional observance

The Academy of Nutrition and Dietetics states that Registered Dietitian Nutritionist Day is celebrated on the second Wednesday in March during National Nutrition Month.

Source-backedFixed AnnualIn-depth guide

World Plumbing Day

11 March · international plumbing profession and public-health awareness observance led by the World Plumbing Council

World Plumbing Council first-party material verifies March 11, an October 2009 WPC launch, the inaugural March 11, 2010 observance and continuing annual WPC stewardship.

How dates are selected

This page combines fixed annual dates, reusable calendar rules and year-specific dates confirmed for 2026. Variable or historical dates are included only when they are clearly supported.

Read the methodology →