Yosemite National Park

Yosemite spans nearly 750,000 acres of the Sierra Nevada, but most visitors experience it through a single glacially carved corridor: Yosemite Valley. That seven-mile stretch packs in more iconic granite formations—Half Dome, El Capitan, Cathedral Rocks—than almost anywhere else on Earth. Outside the Valley, the park stretches into high-country wilderness with meadows, lakes, and the headwaters of the Tuolumne and Merced rivers. It was designated a UNESCO World Heritage Site in 1984 and consistently ranks among the most visited national parks in the country.

Yosemite is best known for its vertical granite walls. El Capitan stands 3,000 feet from base to summit—the tallest unbroken granite face in the world—and Half Dome rises 4,737 feet above the Valley floor. The park's waterfalls are fed by Sierra snowmelt: Yosemite Falls drops 2,425 feet in two tiers, making it one of the tallest waterfalls in North America. Three groves of giant sequoias grow within park boundaries, the most accessible being Mariposa Grove near the south entrance, home to the Grizzly Giant—estimated at 1,800 years old.

By car: Highway 120 (Tioga Road) is the main east-west route through the park, connecting I-395 on the east with Modesto on the west—but it closes in winter. Highway 140 via Mariposa is the most reliable year-round approach and the closest route from the San Francisco Bay Area. Highway 41 from Fresno is the southern approach.

By public transit: YARTS (Yosemite Area Regional Transportation System) runs buses from Merced (where Amtrak Amtrak San Joaquin trains stop), Fresno, and Mammoth Lakes. Buses stop at Valley landmarks and cost roughly $15–25 round trip.

By air: Fresno Yosemite International (FAT) is the nearest major airport, about 65 miles south. San Francisco (SFO) and Sacramento (SMF) are roughly 4 hours by car; Los Angeles (LAX) is about 5–6 hours.

Yosemite's landscape is the product of two forces: plutonic granite and Pleistocene glaciers. The Sierra Nevada batholith—a mass of granite that cooled 80–100 million years ago deep underground—was exposed over millions of years of erosion. During the last ice age, glaciers up to 4,000 feet thick carved the original V-shaped river valley into the broad U-shaped trough visible today. When glaciers retreated roughly 10,000 years ago, they left hanging valleys (where Bridalveil and Yosemite Falls drop off), erratic boulders, and the polished granite domes characteristic of the high Sierra. Half Dome's vertical face was formed not by glacial carving but by a process called exfoliation—sheets of granite peeling away from the dome over time.

The park supports more than 400 species of vertebrates. Black bears are the most discussed—roughly 300 to 500 live in the park, and food storage regulations (bear canisters or metal boxes) are strictly enforced at all campgrounds. Mule deer are common throughout the Valley meadows and are easily spotted at dusk. Coyotes are frequently seen along Valley roads.

The Steller's jay and Clark's nutcracker are the most conspicuous birds; peregrine falcons nest on El Capitan's granite walls. Sierra Nevada bighorn sheep were reintroduced to the Yosemite high country in 1986 and a small herd persists near Tioga Pass. The great gray owl—California's largest owl—is a year-round resident.

The Ahwahnechee people lived in Yosemite Valley for at least 3,000 years before the Mariposa Battalion—a California militia—forcibly entered the valley in 1851 during the Gold Rush era displacement of indigenous peoples.

In 1864, President Abraham Lincoln signed the Yosemite Grant, transferring the Valley and Mariposa Grove to California for preservation—the first time the U.S. government set aside land for public use. This precedent directly inspired the creation of Yellowstone as the first national park in 1872.

John Muir explored the Sierra Nevada extensively starting in 1868 and became Yosemite's most influential advocate, arguing in the press and to President Theodore Roosevelt (who camped here in 1903) that the Valley required federal protection. Congress established Yosemite National Park in 1890. Muir co-founded the Sierra Club in 1892, partly to defend it.

The early 20th century brought roads, lodges, and mass tourism. The Ahwahnee Hotel opened in 1927. A decades-long debate over the Hetch Hetchy Valley—flooded in 1923 to supply San Francisco's water over Muir's fierce opposition—defined the limits of preservation within park boundaries and shaped modern environmental politics.