Flagstaff marks 25 years as the first International Dark Sky City

Flagstaff is celebrating the 25th anniversary of its 2001 designation as the world’s first International Dark Sky City, a milestone that helped launch a global conservation program now covering 277 places on six continents. The city says the anniversary highlights how dark-sky protection has expanded from one community into a worldwide movement tied to wildlife, energy savings, tourism and public education.

Why it matters: - Flagstaff’s 2001 designation helped create the International Dark Sky Places program, which now protects 277 communities, parks, reserves and protected areas worldwide. - The program ties dark-sky protection to real-world benefits, including reduced light pollution, energy savings, nocturnal wildlife protection, cultural preservation and dark-sky tourism. - Flagstaff’s role gives the city a long-running place in the global effort to preserve natural darkness.

What happened: - Oct. 24, 2026 marked the 25th anniversary of Flagstaff’s designation as the world’s first International Dark Sky City. - On Oct. 24, 2001, DarkSky International, then called the International Dark-Sky Association, recognized Flagstaff for protecting its night sky. - The anniversary highlights a designation that became the foundation of the International Dark Sky Places program. - Flagstaff’s 25th Anniversary Celebration event is planned for spring 2027 to coincide with International Dark Sky Week, set for April 5-11, 2027.

The details: - Flagstaff was using the nickname “Skylight City” by 1892. - Lowell Observatory in Flagstaff is where Clyde Tombaugh discovered Pluto in 1930. - The city also is home to the U.S. Naval Observatory Flagstaff Station. - In 1958, Flagstaff banned advertising searchlights after urging from local astronomers. - That ban created the world’s first outdoor lighting ordinance designed to protect the night sky. - In 1989, Flagstaff and Coconino County adopted the world’s first comprehensive outdoor lighting code. - The code governed the spectrum, direction and output of lights. - In 1999, three residents formed the Flagstaff Dark Skies Coalition. - The coalition worked with businesses and the local utility to replace glaring lights. - The coalition proposed recognizing an entire city for protecting its night sky, an idea the association accepted. - Danielle Adams, executive director of the Flagstaff Dark Skies Coalition, said the group proposed an “International Dark-Sky City” program in June 2001. - DarkSky International has since expanded that idea into a broader international program. - In 2007, Natural Bridges National Monument in Utah became the first International Dark Sky Park. - By 2016, 12 National Park Service sites had earned certification, including Sunset Crater Volcano, Walnut Canyon and Wupatki national monuments near Flagstaff. - Nearby communities including Sedona, Big Park/Village of Oak Creek, Camp Verde and Cottonwood later followed. - Petrified Forest and Grand Canyon national parks also joined the network, making northern Arizona one of the densest clusters of Dark Sky Places in the world. - Today, certified places protect more than 237,167 square kilometers across Europe, Asia, Africa, Oceania and the Americas. - DarkSky International says the International Dark Sky Places program is voluntary and non-regulatory. - The program encourages responsible lighting, environmentally responsible outdoor lighting policies and public education. - DarkSky International says indiscriminate artificial light can disrupt ecosystems, affect human health, waste money and energy, contribute to climate change and block humanity’s view of the universe.

Between the lines: - Flagstaff’s history shows how local policy can scale into an international model. - Ruskin Hartley, CEO and executive director of DarkSky International, said the city helped redefine conservation by treating natural darkness as a resource worth protecting. - The program’s growth suggests that night-sky protection has moved from a niche issue to a broader environmental and community planning concern. - Flagstaff’s 2026 retrofit of 4,000 streetlights to narrowband amber LEDs shows the city is still actively updating its lighting standards. - The city still reports a naked-eye view of the Milky Way from downtown, which remains a visible marker of its dark-sky goals.

What’s next: - Flagstaff’s formal anniversary celebration will take place in spring 2027. - The event will align with International Dark Sky Week, when communities around the world are expected to spotlight dark-sky conservation. - DarkSky International will continue promoting the International Dark Sky Places program as a model for communities and protected areas.

The bottom line: - Flagstaff did not just earn a first-of-its-kind designation 25 years ago; it helped create the framework that made dark-sky protection a global movement.