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Yosemite's waterfalls are at their most spectacular in May and June. When the snow starts to melt (usually peaking in May), streaming snowmelt spills down to meet the Merced River. By summer's end, some falls, including the mighty Yosemite Falls, trickle or dry up. Their flow increases in late fall, and in winter they may be hung dramatically with ice. Even in drier months, the waterfalls can be breathtaking. If you choose to hike any of the trails to or up the falls, be sure to wear shoes with no-slip soles; the rocks can be extremely slick. Stay on trails at all times.
Visit the park during a full moon and you can stroll without a flashlight and still make out the ribbons of falling water, as well as silhouettes of the giant granite monoliths.
Of Yosemite's three sequoia groves—the others being Merced and Tuolumne, both near Crane Flat and Hetch Hetchy well to the north—Mariposa is by far the largest and easiest to walk around. Grizzly Giant, whose base measures 96 feet around, has been estimated to be one of the world's largest. Perhaps more astoundingly, it's about 1,800 years old. Park at the grove's welcome plaza, and ride the free shuttle (required most of the year). Summer weekends are crowded.
Hike 1½ miles (3 miles round-trip, 500-foot elevation drop and gain) to the small and scenic Merced Grove and its approximately two dozen mature giant sequoias. The setting here is typically uncrowded and serene. Note that you can also park here and hike about 2 miles round-trip to the Tuolumne Grove. Bring plenty of water for either outing. Strenuous.
