Tioga Pass and Tioga Road: Yosemite’s High Sierra Drive, History and Season

Tioga Road is the only route that crosses Yosemite National Park from west to east, and it climbs to Tioga Pass at 9,945 feet (3,031 m), the highest highway pass in California and in the whole Sierra Nevada. Open for only part of the year, it carries drivers and cyclists from forest to granite domes, alpine meadows and finally a steep drop towards Mono Lake.

Tioga Road and Tioga Pass: the route

Tioga Road is the Yosemite section of California State Route 120. The part the National Park Service ploughs each spring runs 45.5 miles (73 km) from Crane Flat, near the park’s western edge, to the Tioga Pass Entrance Station on the crest. East of the pass the highway drops more than 3,000 feet (910 m) through Lee Vining Canyon to US 395 at Lee Vining, the small town on the south-western shore of Mono Lake.

The pass itself sits between Mount Dana to the east and Gaylor Peak to the west, on the Great Basin Divide. Water falling on its eastern side never reaches the ocean: it drains into the closed basins of the Great Basin, Mono Lake among them.

History of the Tioga Road

The road began as a mining venture. It was built in 1883 to reach the Sheepherder and Tioga silver mines near the crest. The name comes from the Tioga Mine, which was named after the Tioga River in Pennsylvania and New York; “Tioga” is an Iroquois word usually translated as “where it forks”.

The mines soon failed and the road decayed. In 1915 Stephen Mather, who would become the first director of the National Park Service, bought it for $15,000, using his own money and donations from the Sierra Club and the Modesto Chamber of Commerce, and handed it over to the park. The central section was later rebuilt to modern standards, giving the smooth, wide road that drivers use today.

Best stops on Tioga Road

• White Wolf – a forested area with a campground and walks, a short detour off the road.
• Olmsted Point – at about 8,300 feet (2,500 m), a granite viewpoint looking down Tenaya Canyon towards the back of Half Dome.
• Tenaya Lake – a large alpine lake right beside the road, ringed by glacier-polished granite and sandy shores.
• Tuolumne Meadows – the great subalpine meadow at around 8,600 feet (2,600 m), less than 7 miles from the pass, where the Pacific Crest Trail crosses the highway.
• Tioga Pass – trailheads for Gaylor Lakes and the summit of Mount Dana start here, and Tioga Lake lies just beyond the entrance in Inyo National Forest.
• Lee Vining Canyon – the steep eastern descent, with wide views over the Mono Basin.

Watch for marmots on the rocks near the pass; birds of prey, bobcats and occasionally bighorn sheep live in the area too.

When is Tioga Pass open?

Snow closes the road every winter. It is usually open to vehicles from late May or June until around November, and the closure normally runs from about late October to late May. Big winters stretch that: in heavy snow years the road has closed in early October and stayed shut until late July, while in dry years it has opened in April or stayed open into December. In the record 2023 season, ploughing through Olmsted Point was not finished until 21 June. In 2026 the road opened to all traffic on 15 May.

Ploughing usually starts around 15 April. Avalanche crews go ahead of the ploughs, Olmsted Point being the most dangerous avalanche zone, and teams clear deep snow, fallen trees and rockfall. Caltrans clears Highway 120 from Lee Vining up to the entrance. Before opening, the park also restores water, sewer, restrooms, radio and communications and sets up the entrance station, visitor centre and wilderness centre. Cyclists often get the road to themselves for a day or two before cars are allowed.

Plan to be self-sufficient: services along the road are limited, so bring food and water. Check the National Park Service’s Tioga Road updates and Yosemite’s current conditions before you go.

Related reading

• what the Dawn Wall’s first free ascent achieved
• Mount Washington
• Lake Tahoe: Clear Water, Mountain Shores and a Deeper Story
• Mount Robson Provincial Park: A Mountain, a Lake and Different Journeys
• Abraham Lake’s Ice Bubbles: Layers beneath the Surface

Sources