25 Facts About the Grand Canyon That Will Amaze You

Standing on the rim at sunrise, watching light spill across layer upon layer of red rock, it is hard to believe the Grand Canyon is real. Yet the most surprising facts about the Grand Canyon go far beyond its postcard beauty. From rocks nearly two billion years old to a village at the bottom that still gets its mail by mule, this Arizona wonder is full of stories most visitors never hear. Here are 25 of them.

Facts About the Grand Canyon’s Size and Scale

The Grand Canyon is one of those places where the numbers sound made up until you see it yourself. These facts about the Grand Canyon put its staggering dimensions into perspective.

1. It is 277 miles long. Measured along the winding course of the Colorado River, the canyon stretches 277 river miles from Lees Ferry in the east to the Grand Wash Cliffs in the west. That is roughly the driving distance from New York City to Washington, D.C.
2. It is up to 18 miles wide. At its widest point, the distance from the South Rim to the North Rim spans about 18 miles of cliffs, buttes, and side canyons. From the rim, the far side often looks close enough to touch, but the hike between rims takes most people two to three days.
3. It plunges more than a mile deep. At its deepest point, the canyon drops about 6,093 feet from rim to river. If you stacked four Empire State Buildings on top of each other inside it, the top one would still sit below the rim.
4. The national park covers more than 1.2 million acres. Grand Canyon National Park protects roughly 1,218,375 acres, an area larger than the state of Rhode Island. Only a small fraction of visitors ever venture below the rim into this vast backcountry.
5. Around five million people visit every year. The park draws roughly five million visitors annually, making it one of the most visited national parks in America. The vast majority stay on the South Rim, which is open all year, while the quieter North Rim welcomes far fewer travelers.

Facts About the Grand Canyon’s Rocks and Geology

Few facts about the Grand Canyon are more humbling than its geology. The canyon walls are a timeline of Earth’s history, with each layer older than the one above it.

6. The oldest rocks are nearly 1.8 billion years old. The dark Vishnu Schist visible at the bottom of the Inner Gorge formed almost 1.8 billion years ago, when the first complex life on Earth was still hundreds of millions of years in the future.
7. The rim rock is about 270 million years old. The pale Kaibab Limestone that caps both rims was deposited when Arizona lay beneath a shallow tropical sea. Between the rim and the river lies a gap of roughly 1.5 billion years of missing time.
8. The river carved it over five to six million years. Scientists estimate that the Colorado River began cutting down through the Kaibab Plateau around five to six million years ago, and erosion is still deepening and widening the canyon today.
9. It holds the “Great Unconformity.” This famous geological feature is a gap in the rock record where roughly 1.2 billion years of Earth’s history simply vanished, eroded away before younger layers were deposited on top. Geologists travel from around the world to study it.
10. It is not the world’s longest or deepest canyon. One of the most surprising facts about the Grand Canyon is what it is not. Longer and deeper canyons exist elsewhere on the planet, including the Yarlung Tsangpo Canyon in Tibet and the Kali Gandaki Gorge in Nepal. The Grand Canyon’s fame comes from its unmatched combination of size, depth, and exposed geology.

Facts About the Grand Canyon’s Human History

People have lived in and around the canyon for thousands of years, long before it became a national park. Its human story is as layered as its rocks.

11. Eleven Native American tribes are traditionally associated with it. Ancestral Puebloan people built granaries and dwellings in the canyon centuries ago, and today eleven tribes maintain deep cultural connections to the place, including the Hopi, Navajo, Havasupai, Hualapai, and Southern Paiute.
12. John Wesley Powell made the first recorded river run in 1869. The one-armed Civil War veteran led a daring expedition of ten men in four wooden boats down the Colorado River through the canyon. Three months later, only six men emerged. Powell’s journals popularized the name “Grand Canyon.”
13. Theodore Roosevelt protected it before it was a park. After visiting in 1903, Roosevelt declared it a national monument in 1908, saying Americans should keep it “for your children and your children’s children.” Congress established Grand Canyon National Park on February 26, 1919.
14. It became a park after Arizona became a state. Arizona joined the Union in 1912, and the Grand Canyon became a national park seven years later. Mining and railroad interests had fought park status for years, worried it would block development.
15. A village at the bottom still gets mail by mule. Supai, home of the Havasupai Tribe deep in a side canyon, is one of the most remote communities in the continental United States. Letters and packages are carried in and out by mule train, the last such mail route in the country. Many travelers combine the canyon with a Route 66 road trip through northern Arizona.

Grand Canyon Wildlife and Nature Facts

The canyon’s extreme elevation changes create stacked life zones, from desert at the river to forests on the rims, and some of its animals live nowhere else on Earth.

16. California condors soar over the rims again. With wingspans of nearly ten feet, California condors are the largest flying land birds in North America. Reintroduction programs have brought them back to the canyon after they nearly vanished from the wild.
17. Its pink rattlesnakes live nowhere else. The Grand Canyon rattlesnake is a pinkish subspecies found only within the canyon, its coloration blending perfectly with the surrounding rock. It is one of the most striking examples of camouflage in the animal kingdom.
18. The Kaibab squirrel exists only on the North Rim. This tassel-eared squirrel lives solely on the Kaibab Plateau, isolated by the canyon itself. Its close relative, the Abert’s squirrel, lives on the South Rim, and the two evolved apart because the canyon kept them separated.
19. Temperatures swing wildly between rim and river. In winter, snow blankets both rims while the inner canyon stays mild. In summer, temperatures at the Colorado River regularly climb past 100 degrees Fahrenheit. Hikers can pass through several climate zones in a single day.
20. Havasu Creek glows blue-green from minerals. The famous turquoise color of Havasu Falls comes from travertine, a mineral deposited by the creek’s limestone-rich water. The falls sit on the Havasupai Reservation and rank among the most beautiful places in America.

Facts About Visiting the Grand Canyon

Planning a trip? These facts about the Grand Canyon will help you experience it like someone who has done their homework.

21. You can sleep at the bottom of the canyon. Phantom Ranch, a rustic lodge near the Colorado River, is the only lodging below the rim. Reaching it means hiking or riding a mule down trails that descend nearly a mile, and reservations are notoriously hard to get.
22. The Bright Angel Trail is about nine and a half miles to the river. This historic trail, with water stations and shade along the way, is the most popular route into the canyon. The steeper South Kaibab Trail covers about seven miles to the river but offers no water.
23. The glass Skywalk hangs over the canyon’s edge. Opened in 2007 on Hualapai tribal land at Grand Canyon West, the horseshoe-shaped glass bridge extends about 70 feet past the rim, with the canyon floor visible some 4,000 feet below your feet.
24. The North Rim closes for winter. Sitting about 1,000 feet higher than the South Rim, the North Rim is typically open only from mid-May to mid-October. Heavy snow shuts down its roads and lodges each winter, giving it a short, serene season.
25. Astronauts say it is visible from space. The canyon’s immense scar across the Arizona desert is so vast that astronauts have reported spotting it from orbit, a fitting final entry in any list of canyon wonders, unlike the quieter hidden gems in the USA most travelers never see.

Plan Your Own Grand Canyon Adventure

The Grand Canyon rewards the curious. Whether you hike below the rim, raft the Colorado River, or simply watch sunset paint the walls gold, what you have read here is only the beginning. Start planning your trip, arrive early to beat the crowds, carry more water than you think you need, and take nothing but photographs. America’s greatest natural wonder has been waiting millions of years, and it is ready when you are.