World Earthworm Day
October 21
About World Earthworm Day
World Earthworm Day takes place every year on 21 October and celebrates one of the most ecologically important yet overlooked animals on the planet. Established by the Earthworm Society of Britain in 2016, the day encourages people to learn about earthworms, their role in building healthy soil, and why their conservation matters. In 2026 it falls on Wednesday, 21 October.
What is World Earthworm Day?
World Earthworm Day is an annual awareness day dedicated to earthworms and the vital part they play in soil health, agriculture, and the wider environment. It was created by the Earthworm Society of Britain (ESB), a registered charity devoted to the study and conservation of earthworms across Britain and Ireland. The day is for gardeners, farmers, teachers, scientists, and anyone curious about the natural world, and it aims to raise the profile of an animal that quietly shapes the ground beneath our feet. The campaign is shared widely using the hashtag #EarthwormsAreImportant.
When is World Earthworm Day?
World Earthworm Day is held on 21 October every year, and in 2026 it falls on Wednesday, 21 October. The date is fixed and does not move, so it is easy to mark in your diary year after year. October was deliberately chosen to honour Charles Darwin, whose final book on earthworms was published in that month in 1881.
Why World Earthworm Day Matters
Earthworms are often called ecosystem engineers because of the outsized influence they have on the soil. Their burrowing aerates the ground, improves drainage, and mixes organic matter into deeper layers, while their digestion turns plant litter into nutrient-rich castings that nourish growing crops. On a single acre of cultivated land, earthworms can move roughly eight tonnes of soil in a year, helping to form a fresh layer of fertile earth. With healthy soil underpinning the food we grow and the carbon the land can store, the humble earthworm is far more significant than its size suggests. Drawing attention to soil-dwelling creatures also connects neatly to broader environmental concerns, much like World Soil Day, which highlights the importance of protecting the ground we depend on.
How to Get Involved in World Earthworm Day
There are plenty of simple ways to take part, whether you have a garden, an allotment, or just a window box.
- Dig a little and look – Carefully turn over a patch of soil or compost and count the earthworms you find. A healthy plot should be teeming with them, and it is a quick way to gauge the condition of your ground.
- Start a compost heap – Composting kitchen and garden waste creates the perfect habitat for earthworms while reducing what you send to landfill. The worms will repay you with rich, crumbly compost.
- Avoid chemical pesticides – Many garden chemicals harm earthworms and the wider soil food web. Choosing organic methods helps populations thrive.
- Get children involved – Earthworms are an ideal introduction to nature for young learners. A simple worm hunt or wormery makes science hands-on and memorable.
- Record your sightings – The Earthworm Society of Britain runs surveys and recording schemes. Submitting your observations adds to the scientific understanding of where different species live.
- Build a wormery – A home wormery lets you watch earthworms at work breaking down food scraps, and produces a potent liquid feed for plants.
- Spread the word online – Share photos and facts using #EarthwormsAreImportant to help more people appreciate these underground allies.
History of World Earthworm Day
World Earthworm Day was launched by the Earthworm Society of Britain in 2016. The society wanted to give people a dedicated moment each year to celebrate earthworms and to challenge the idea that they are slimy or unimportant. The first World Earthworm Day was held on Friday, 21 October 2016, and the tradition has been repeated on the same date every year since, growing steadily with an ever-increasing number of supporters and partner organisations.
The choice of October is no accident. It honours Charles Darwin, often described as the father of earthworm ecology. Darwin spent more than four decades observing earthworms and recognised their remarkable role in forming fertile topsoil. His final book, “The Formation of Vegetable Mould, Through the Action of Worms, with Observations on their Habits”, was published in October 1881, only months before his death the following year.
Since those early observations, science has confirmed just how influential earthworms are. They are now understood as keystone soil species, and World Earthworm Day has become a useful focal point for educators and conservationists keen to communicate that message to a wider audience.
Noteworthy Facts About World Earthworm Day
- There are roughly 7,000 known species of earthworm worldwide, varying enormously in size, colour, and habitat.
- Charles Darwin studied earthworms for around 45 years, beginning and ending his scientific career with them.
- Earthworms on a single acre of farmland can shift about eight tonnes of soil in a year.
- The day was founded in 2016 by the Earthworm Society of Britain, a charity focused on earthworm study and conservation.
- The campaign hashtag #EarthwormsAreImportant is used each year to rally support online.
Frequently Asked Questions
What is World Earthworm Day?
World Earthworm Day is an annual awareness day on 21 October that celebrates earthworms and the essential role they play in building healthy, fertile soil. It was founded by the Earthworm Society of Britain in 2016.
When is World Earthworm Day in 2026?
In 2026, World Earthworm Day falls on Wednesday, 21 October. The date is fixed and is the same every year.
Why is World Earthworm Day in October?
October was chosen to honour Charles Darwin, the father of earthworm ecology, whose final book on earthworms was published in October 1881. Darwin spent more than 40 years studying their role in shaping the soil.
Spread the Word
Help raise awareness by sharing World Earthworm Day with your friends, family, and followers. Use the hashtags #EarthwormsAreImportant and #WorldEarthwormDay2026 on social media. The more people who appreciate earthworms, the better we can protect the soil they help to build.
Related Awareness Days
- World Soil Day – Marks the importance of healthy soil and the threats it faces, a natural companion to celebrating the creatures that build it.
- National Be Nice to Bugs Day – Encourages appreciation of the small invertebrates, including earthworms, that keep ecosystems running.
- International Mud Day – Celebrates getting hands dirty and reconnecting with the earth, perfect for budding earthworm enthusiasts.
Links
- Visit the official World Earthworm Day page from the Earthworm Society of Britain
- Explore more awareness days at AwarenessDays.com
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