Arecibo Observatory

Photo credit: © Jirka Matousek CC BY

Take a tour and explore the Arecibo Observatory, a massive complex complete with a one-thousand ton antenna. A trip to the observatory will include presentations, explorations, as well as a historical lesson of the largest radio-telescope on Earth.

What to Expect

Arecibo offers an educations program to guests called "More Than Meets the Eye - Exploring he Invisible Universe." The program teaches about using all senses to explore the uncharted universe, and focuses on the electromagnetic spectrum and what it is that they do at the observatory.

Outside of this class, guests can take a seat in the auditorium for a 20 minute audiovisual show called "A Day in the Life of the Arecibo Observatory."

Arecibo is the largest radio telescope in the world. It sits in 1,300 foot scross Karst sink hole, and the dish itself is measures in at 20 acres.

Staying Close

Consider staying in Arecibo if you plan on visiting Arecibo Observatory, as travelers to this region of Puerto Rico will have the benefit of convenient access to the historical site during their time there. With only a few accommodations in the neighborhood within the vicinity of Arecibo Observatory, only moderate foot traffic might be bargained on.

Hotels near Arecibo Observatory
Hotel Type Island Distance Direction
Casa Grande Mountain Retreat Lodge Puerto Rico 8.4 mi. (6.7 km) ESE


Arecibo Observatory is located near the middle of the island of Puerto Rico, 8.6 miles south of Arecibo; it is 6.0 miles to the northwest of Utuado.

If you plan on visiting the observatory, you are in for a bit of a drive. Luckily, you only need to take one road to get there. PR-625, which originates in San Juan ends at the observatory.


Operating Hours

The observatory is open to the public from 9:00 a.m. until 4:00 p.m. During the Regular Season, the observatory is closed on Mondays and Tuesdays, though is open daily during the Winter and Summer Seasons.

The observatory is open to the public only during parts of the year. Their Summer Season is from June 1 until July 31, he main Regular Season is from August 1 until December 14, and the Winter Season is from December 15 until January 15. They are closed on all holidays, including Mother's Day, Father's Day, and Three Kings Day.


If you need to know the price of admission, dial up Arecibo Observatory beforehand to find out if they charge, and if so, how much.

Contact Information

Phone Number: (787) 878-2612 ext. 312

Location: PR-625 at the end, Puerto Rico



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