McDonald Observatory: Unmissable Star Parties and World-Class Telescopes Under West Texas Dark Skies
Secure the hottest ticket in West Texas: a spot at one of McDonald Observatory's thrice-weekly Star Parties in Fort Davis. Perched on Mount Locke and Mount Fowlkes in the remote Davis Mountains, the observatory boasts some of the darkest skies in the continental U.S. This pristine environment lets visitors witness stars, planets, constellations, and meteors in their full brilliance, free from urban light pollution. At these two-hour Star Parties, expert staff highlight key stars and constellations, followed by telescope viewing sessions for an immersive sky experience.
Hosting several of the world's largest telescopes, McDonald Observatory is equally captivating by day. Guided tours of research telescopes run multiple times weekly, while filtered scopes in the visitor center enable safe solar viewing. Opt for a general admission ticket for self-guided summit tours of Mount Locke and Mount Fowlkes, plus access to the exhibit gallery and gift shop.
Located 450 miles west of Austin and 520 miles southwest of Dallas, the observatory is closed Sundays and Mondays. Star Parties occur Tuesdays, Fridays, and Saturdays, with seasonal start times—book at least two weeks ahead.
History of McDonald Observatory
A key research hub for the University of Texas at Austin's Astronomy Program, McDonald Observatory was funded by banker and lawyer William J. McDonald, who bequeathed much of his estate in 1926 for its construction.
Dedicated in 1936, the 2.1-meter Struve Telescope—named for founding director Dr. Otto Struve—was the world's second-largest at the time and remains operational with upgraded instruments. The 2.7-meter Harlan J. Smith Telescope followed in 1968. The 11-meter Hobby-Eberly Telescope, dedicated in 1997 and upgraded in 2017, ranks among the largest optical telescopes globally, probing star and galaxy light, dark energy, and more. Smaller telescopes dot the grounds.
Currently, the observatory partners with U.S. universities on the Giant Magellan Telescope—a 25-meter, seven-mirror instrument in Chile—slated for 2029 operation.
Essentials for Star Parties
Tuesday, Friday, and Saturday evenings kick off in the outdoor amphitheater with a staff-led orientation. The 30-minute Constellation Tour blends mythology and science under a star-filled sky, where the Milky Way dazzles on clear nights. Conclude with 90 minutes of telescope stargazing at Rebecca Gale Telescope Park, with staff on hand for queries.
Note: Research telescopes feed data to scientists, not public viewing.
What to Bring
Binoculars are welcome, but preserve dark skies: skip white-light flashlights, opting for red lights or headlamps. Avoid bright camera screens and flash photography. Layer up warmly, add a blanket—the high-elevation outdoor events run 10°F cooler than the mountain base.
Best Time to Visit
Book around new moon phases—pre-first quarter or post-full—for peak visibility, as full moons dim stars and the Milky Way. Fall offers clearest skies; July-August brings more rain.
Daytime Programs
General admission ($3) grants visitor center access, exhibits, and self-guided tours of Mount Locke (Struve and Harlan J. Smith Telescopes) and Mount Fowlkes (Hobby-Eberly Telescope). View the latter from the George T. Abell Gallery inside its dome. Drive between summits.
Guided tours ($10 adults/$5 under 5; reservations advised) visit Harlan J. Smith and Hobby-Eberly domes, covering history, design, and research—drive your vehicle. Solar viewing ($5, 45 minutes, ~1pm Tuesdays/Fridays/Saturdays) uses filtered telescopes for on-screen sun images and expert talks.
Preserving Dark Skies
West Texas' exceptional dark skies fuel premier stargazing, but development threatens them with light pollution. McDonald Observatory collaborates with Big Bend National Park, Big Bend Ranch State Park, and partners to monitor, retrofit fixtures, promote dark-sky practices, and educate the public.
Plan Your Visit
Open Tuesday-Saturday, 10am-5pm (Central Time/CDT). Tickets: General $3; Tours $10 adults/$5 kids under 5 (seniors/military $8); Star Parties $25 adults/$5 kids under 5 (seniors/military $20); Solar $5. Call 432-426-3640 or visit the website for accessibility info.
