Polly Dome

Overview

Polly Dome rises just north of Tenaya Lake, a gleaming chunk of granite with big views and a surprisingly wild feel. You’ve got two flavors here: a mellow on-trail hike to quiet forest lakes, or an off-trail granite ramble up the dome itself. Either way, expect classic Yosemite high-country granite, airy vistas, and a crash course in Ice Age geology.

Hiking Options

• Polly Dome Lakes Trail: An out-and-back of about 5.3 miles (8.5 km) with roughly 643 feet (196 m) of gain. It starts across Tioga Road from Tenaya Lake and winds through subalpine forest to a short spur for the lakes. Plan around 2 hours 10 minutes. Reviewers call out peaceful water, scenic granite, and mosquitoes—bring repellent. Some sections are unmarked, so a map/GPS helps.
• Off-trail Dome Ascent: From roadside pullouts or the picnic area along Tenaya’s north shore, you can head up open granite slabs to Polly Dome. There’s no maintained trail—think easy Class 2 on slabby ribs with patches of brush or talus. Pick your line carefully, favor ribs over gullies, and avoid wet or sandy-over-slab sections. Fit hikers often do it in a few hours, but plan conservatively if you’re new to off-trail granite.

What You’ll See

From the dome, you’re looking straight down at Tenaya Lake with the Cathedral Range stretching south, and the Hoffmann/May Lake area to the west. On clear days you can spot big-name summits down the drainage. Up close, the granite tells its story: glossy glacial polish, linear striations etched by moving ice, scattered erratic boulders, and broad exfoliation sheets that shape the dome’s curves.

Geology in Brief

During the last glacial maximum, thick ice from the Tuolumne Ice Field spilled into the Tenaya Basin and down Tenaya Canyon, planing and polishing domes like Polly. The ice stood hundreds to more than a thousand feet higher than today’s terrain here, leaving the smooth surfaces, striations, and erratics you’ll walk past.

Access, Parking, and Facilities

For the lakes trail, use the Murphy Creek trailhead on Tioga Road, directly across from Tenaya Lake. Expect limited roadside parking, vault toilets, and bear lockers. Vault toilets mean no drinking water—bring your own. There are also small pullouts along the lake if you’re heading for the off-trail dome ascent. Tioga Road is seasonal; closures typically run through late spring, and there’s no overnight parking after mid-October.

Safety and Wildlife

Granite slabs get dangerously slick when wet—turn back if rain threatens. You’re above 8,000 feet, so pace yourself, hydrate, and pack sun protection and layers for quick-changing mountain weather. Typical wildlife includes mule deer, marmots, Clark’s nutcrackers, and Steller’s jays; black bears are possible near lake shores. Use bear lockers and keep scented items out of your vehicle.

Permits and Rules

Day hiking requires no permit. Overnight trips do—use the Murphy Creek trailhead quota, reserve ahead, and expect a small per-person fee. Pick up your permit at a designated station and store food in approved bear-resistant containers.

Best Time to Visit

Come when Tioga Road is open—summer into early fall. Start early on weekends to find parking and enjoy calmer air for reflections on Tenaya Lake. For photos, soft light at sunrise or late afternoon works best; mid-day can be harsh. Expect mosquitoes near the lakes in early summer, especially at dusk.