Earth Day 2026

Earth Day 2026 is on Wednesday, April 22. The holiday has been observed on this date since it started more than 50 years ago. The original organizers selected April 22 to maximize the number of students that could be reached on university campuses, as it was a weekday between spring break and final exams.

By the early 1960s, Americans were becoming aware of the effects of pollution on the environment. Rachel Carson’s 1962 bestseller Silent Spring raised the specter of the dangerous effects of pesticides on the American countryside. Later in the decade, two environmental disasters in 1969 further heightened public awareness of the ecosystem’s fragility. That January, a massive oil spill broke out off the coast of Santa Barbara, California, killing thousands of animals and turning local beaches black. Then, in June, a fire on Cleveland’s Cuyahoga River shed light on the problem of chemical waste disposal.

Until that time, protecting the planet’s natural resources was not part of the national political agenda, and the number of activists devoted to large-scale issues such as industrial pollution was minimal. Factories pumped pollutants into the air, lakes and rivers with few legal consequences. Big, gas-guzzling cars were considered a sign of prosperity. Only a small portion of the American population was familiar with–let alone practiced–recycling.

Elected to the U.S. Senate representing Wisconsin in 1962, Democratic Senator Gaylord Nelson was determined to convince the federal government that the planet was at risk. In 1969, Nelson developed the idea for Earth Day after being inspired by the anti-Vietnam War “teach-ins” that were taking place on college campuses around the United States. According to Nelson, he envisioned a large-scale, grassroots environmental demonstration “to shake up the political establishment and force this issue onto the national agenda.”

Nelson announced the Earth Day concept at a conference in Seattle in the fall of 1969 and invited the entire nation to get involved. He later recalled:

“The wire services carried the story from coast to coast. The response was electric. It took off like gangbusters. Telegrams, letters and telephone inquiries poured in from all across the country. The American people finally had a forum to express its concern about what was happening to the land, rivers, lakes and air—and they did so with spectacular exuberance.”

Denis Hayes, a young activist who had served as student president at Stanford University, was selected as Earth Day’s national coordinator, and he worked with an army of student volunteers and several staff members from Nelson’s Senate office to organize the project. “Earth Day worked because of the spontaneous response at the grassroots level,” Nelson shared with the Journal of the Sierra College Natural History Museum. “We had neither the time nor resources to organize 20 million demonstrators and the thousands of schools and local communities that participated. That was the remarkable thing about Earth Day. It organized itself.”

On the first Earth Day on April 22, 1970, rallies were held in Philadelphia, Chicago, Los Angeles and most other American cities, according to the Environmental Protection Agency. In New York City, Mayor John Lindsay closed off a portion of Fifth Avenue to traffic for several hours and spoke at a rally in Union Square with actors Paul Newman and Ali McGraw. In Washington, D.C., thousands of people listened to speeches and performances by singer Pete Seeger and others, and Congress went into recess so its members could speak to their constituents at Earth Day events.

The first Earth Day was effective at raising awareness about environmental issues and transforming public attitudes. According to the EPA: “Public opinion polls indicate that a permanent change in national priorities followed Earth Day 1970. When polled in May 1971, 25 percent of the U.S. public declared protecting the environment to be an important goal, a 2,500 percent increase over 1969.” Earth Day kicked off the “Environmental decade with a bang,” as Senator Nelson later put it. As the founder of Earth Day, he is considered one of the leaders of the modern environmental movement.

During the 1970s, a number of important pieces of environmental legislation were passed, among them the Water Quality Improvement Act, the Clean Water Act, the Endangered Species Act, the Toxic Substances Control Act, the Surface Mining Control and Reclamation Act and an overhaul of the Clean Air Act, which had initially passed in 1963. Another key development came in December 1970 with the establishment of the Environmental Protection Agency, which was tasked with protecting human health and safeguarding the natural environment: air, water and land.

Since 1970, Earth Day celebrations have grown exponentially. In 1990, Earth Day went global, with 200 million people in over 140 nations participating, according to the Earth Day Network (EDN), a nonprofit organization that coordinates Earth Day activities. In 2000, Earth Day focused on clean energy and involved hundreds of millions of people in 184 countries and 5,000 environmental groups, according to EDN. There were a range of activities, such as a traveling, talking drum chain in Gabon, Africa, and a gathering of hundreds of thousands of people at the National Mall in Washington, D.C. Like on its sibling holiday of Arbor Day, tree planting is a common Earth Day activity.

More recently, the April holiday has revolved around protecting the planet amid climate change. In 2016, leaders from 175 countries signed onto the landmark climate-focused Paris Agreement on Earth Day.

Today, the Earth Day Network collaborates with more than 150,000 partners and organizations in 192 countries. According to EDN, more than 1 billion people are involved in Earth Day activities, making it “the largest secular day of protest in the world.”