There is a conversation I have every August, usually near the Lower Yosemite Fall footbridge, with a visitor holding up a phone. The phone shows a photograph of Yosemite Falls at full thunder, 2,425 feet of whitewater filling the frame. The cliff in front of us shows a dark stain on granite and a quiet pool. The visitor wants to know what happened to the waterfall. The answer, which I have now delivered for twenty seasons in various tones of apology, is that nothing happened to it. The photograph was taken in May. It is now August. Yosemite's waterfalls are not features. They are events, and most of them are over by midsummer.
This is the single most useful thing to understand before planning a waterfall trip, and it is the thing the internet is worst at telling you. Waterfall photos are almost never captioned with the month they were taken. The park's marketing runs on peak-flow imagery year-round. So people arrive in September expecting the postcard and find the plumbing turned off, and they assume they did something wrong. They didn't. They just weren't told the schedule.
Here is the schedule.
Nearly every famous waterfall in Yosemite is fed by snowmelt, not by springs, glaciers, or reliable year-round rivers. The creeks that pour over the Valley rim (Yosemite Creek, Ribbon Creek, Sentinel Creek, Horsetail's seep) drain small, shallow granite basins above the walls. Those basins hold no meaningful groundwater. They hold snow. When the Sierra snowpack melts, roughly April through June, the creeks surge and the falls detonate. When the snow above the rim is gone, usually sometime in July, the creeks drop with it, and by late summer several of the most photographed waterfalls on Earth are dry streaks on rock.
The exceptions matter just as much. Vernal and Nevada Falls sit on the main stem of the Merced River, which drains hundreds of square miles of high country and never stops flowing. Bridalveil Fall drains a forested basin that releases its water slowly, so it runs all year, thinning to a veil by autumn but never quitting. Knowing which falls are creek-fed and which are river-fed is the whole game.
April through June is the show. Everything else is the off-season, and nobody puts that on the poster.
At 2,425 feet top to bottom, Yosemite Falls is the tallest waterfall in North America and among the tallest in the world. It comes in three acts: the Upper Fall's 1,430-foot free leap, 675 feet of middle cascades hidden in a corner of the cliff, and the 320-foot Lower Fall that most visitors actually stand in front of. In May, at peak melt, you can hear it from across the Valley, feel spray on the footbridge a quarter mile from the base, and watch the entire column shudder in wind.
And then it leaves. In a typical year the flow thins visibly through July and is often gone entirely by late August, leaving a dark stain on the cliff until the first storms of November wet it again. In a big snow year it may limp into September. In a lean one it can quit in early August. If Yosemite Falls is the reason for your trip, book spring, full stop.
Two practical notes. First, the Lower Yosemite Fall loop is a one-mile paved trail, flat and wheelchair accessible, and it delivers one of the best waterfall views in the park for zero effort; I've written more about it in the accessibility guide. Second, in deep winter the base of the Upper Fall grows a frazil ice cone, a hill of frozen spray that can stand hundreds of feet tall by February. The fall in January is modest, but the cone is worth the walk.
Bridalveil Fall, 620 feet, is the first waterfall nearly every visitor sees, hanging on the south wall as you come out of the Wawona Tunnel or up Highway 140 into the Valley. It is also the most dependable: the only major Valley fall that flows year-round, heavy in spring, a drifting ribbon by October, but always present.
The Ahwahneechee called it Pohono, often translated as spirit of the puffing wind, and the name is a field observation. Bridalveil rarely falls straight. Afternoon breezes catch the column and swing it sideways across the cliff face, sometimes lifting the lower half into pure mist before it reaches the ground. In light wind it does not fall so much as drift. The approach trail and viewing area were rebuilt in a multi-year restoration finished in 2023, and the short paved walk to the base is an easy add to any Valley day. Expect to get wet at the viewpoint in May. That is the product working as intended.
Up the Merced canyon east of the Valley, the river drops off the high country in two clean steps: Nevada Fall (594 feet) and then Vernal Fall (317 feet), the pair geologists call the Giant Staircase. Because these are river falls, not creek falls, they are the answer to the late-summer visitor's question: they flow impressively in every month of the year. In spring they are violent; the Mist Trail alongside Vernal earns its name by soaking every hiker to the skin through May and June. By September they are merely large, which by any other park's standard is still enormous.
The hike is the most popular hard trail in the park and has real rules worth knowing: wet granite steps, crowd chokepoints, and a smarter descent route via the John Muir Trail. I've covered all of it in the real guide to the Mist Trail. From the same corridor you can also catch Illilouette Fall (370 feet), which hides in a side canyon and shows itself in glimpses from the trail below Vernal; the full view requires the Panorama Trail from Glacier Point. Illilouette drains a big basin and holds water later than the rim falls, well into fall most years.
Ribbon Fall, on the west shoulder of El Capitan, is the tallest single uninterrupted drop in North America at 1,612 feet, higher than any one tier of Yosemite Falls. Almost nobody has heard of it, because almost nobody sees it. Its watershed is tiny, and the fall exists for roughly April through June and then vanishes so completely that summer visitors stare at the cliff and see nothing at all. In May it is astonishing. Catch it from the Valley loop road pullouts west of El Capitan Meadow.
Horsetail Fall, on El Capitan's east face, is a modest seasonal ribbon that would be a footnote except for two weeks in February, when the setting sun can light the falling water orange and produce the natural firefall. That event now has reservations, road closures, and a culture of its own, and it gets its own article. The short version: it needs water in the fall and a clear western horizon at sunset, and neither is guaranteed.
Sentinel Fall, across the Valley from Yosemite Falls near Sentinel Rock, drops nearly 2,000 feet in a chain of cascades and gets a fraction of the attention because there is no trail to it and no signed viewpoint. Spring only. Look for it from the Four Mile Trail area or from Southside Drive; by July it is gone.
In the park's northwest corner, Hetch Hetchy keeps its own pair of falls above the reservoir. Tueeulala Falls is a wispy free-leaper that dries by early summer. Wapama Falls is the serious one, a broad, brawling cascade dropping well over a thousand feet, and the flat trail from O'Shaughnessy Dam crosses footbridges directly beneath it. At moderate flow this is the best waterfall shower in the park. At peak flow it is genuinely dangerous: snowmelt surges can send water over the bridges themselves, hikers have been swept off and killed there, and the park closes the crossings when flow demands it. If the bridges are running white, the view from the near side is the whole hike. Turn around.
Hetch Hetchy sits low, around 3,900 feet, so it melts out early. April and May are the window; by July the trail is hot and Tueeulala is a memory.
January. Low but alive. Falls run thin between storms and swell for a day or two after rain. The frazil ice cone builds at the base of Upper Yosemite Fall.
February. Still winter-thin, with one exception: the Horsetail Fall firefall window in the middle of the month, weather permitting.
March. The turn. Warm spells send the first real melt pulses over the rim. Flows rise week by week.
April. The show opens. Every named fall is running, including Ribbon and Sentinel. Hetch Hetchy peaks now through May.
May. Peak. This is the month the postcards were taken. Yosemite Falls at maximum, the Mist Trail a drenching, moonbows on the full moon. If you can pick any month, pick this one.
June. Still excellent, beginning to taper in lean snow years. The ephemerals start to fade late in the month.
July. The decline is visible week to week. Ribbon and Sentinel are gone; Yosemite Falls thins to a stream.
August. Yosemite Falls is often dry by late month. Bridalveil, Vernal, Nevada, and Illilouette carry the season.
September and October. The low ebb. River falls still perform; the rim falls are stains. Come for other reasons.
November and December. First storms bring brief resurrections: a dry Yosemite Falls can roar back for a day after a big rain, then subside. Watch the forecast, not the calendar.
On clear nights around the full moons of April, May, and June, the spray at the base of Lower Yosemite Fall can throw a moonbow, a lunar rainbow arcing through the mist. To the naked eye it reads as a pale silver band; a camera on a tripod pulls the colors out. You need heavy spray, a bright moon low enough to hit it, and dark-adjusted patience. Spring full-moon nights at the Lower Fall bridge draw a small crowd of tripods for exactly this reason, and it is one of the few world-class sights in the park that happens after bedtime.
Plan a waterfall trip for April through June, with May as the bullseye. Those months also carry real crowds, which is a solvable problem covered in the 2026 crowd forecast. Before you drive, check current webcams and flow reality on the conditions page rather than trusting any photograph, including ours.
And if your trip is already booked for August or September: adjust expectations, not plans. Walk the Mist Trail for Vernal and Nevada, stand under Bridalveil, and save the Lower Yosemite Fall loop for a spring return. The falls will be back. They always come back. They just refuse to perform on demand, which, after twenty seasons of watching them, I have come to regard as the most honest thing about them.