Mount Wilson Observatory

Mount Wilson Observatory — Discover Astronomy & History Above Pasadena

Perched at 5,710 feet atop Mount Wilson in the San Gabriel Mountains near Pasadena, the Mount Wilson Observatory is one of Southern California’s most iconic astronomical landmarks. Founded in 1904 by astronomer George Ellery Hale and backed by the Carnegie Institution, it ushered in a new era of observatory science 

Historical Significance & Scientific Legacy

• Pioneering Telescopes

  • The 60-inch reflector (1908) was the world’s largest operational telescope at its opening.

  • The 100-inch Hooker Telescope (1917) became the largest in the world and played a crucial role in Edwin Hubble’s discovery of the expanding universe.

• Trailblazing Discoveries

  • Home to astronomical greats like Harlow Shapley, Albert Michelson, and Edwin Hubble, the observatory helped transform our understanding of the cosmos.

  • In 1926, Nobel laureate Albert Michelson measured the speed of light using mirrors placed 22 miles apart—an experiment conducted from Mount Wilson.

What to See & Do at Mount Wilson Observatory

• Visitor Experiences

  • Free access to the Visitor’s Gallery within the historic 100-inch telescope dome, the Astronomical Museum, and the CHARA Interferometry Exhibit.

  • Guided weekend tours, self-guided options, engineering tours, and educational programs for all ages.

• Cosmic Café

  • Open on weekends, this café offers lunch with panoramic views—on clear days, you can see as far as Catalina Island.

  • Special Events & Stargazing

  • Enjoy unique events like concerts inside the 100-inch dome, public telescope nights, lectures, and arts programs.

Visiting Details & Travel Tips

• Location & Parking

  • Access via Angeles Crest Highway (CA-2) from the 210 Freeway at La Cañada Flintridge—tip: download the observatory’s PDF map for accurate directions instead of relying solely on GPS.

  • A U.S. Forest Service Adventure Pass (around $5/day) is needed for parking.

• Opening Hours

  • Typically open daily from 10:00 AM to 5:00 PM, though hours may vary seasonally or due to weather.

• Accessibility Notice

  • At 5,710 feet elevation, visitors should be mindful of altitude changes and physical exertion—individuals with heart or respiratory conditions, or limited mobility, should proceed with caution.