Lower Falls of the Yellowstone: When It Actually Flows
The 308 foot centerpiece of the Grand Canyon of the Yellowstone, nearly twice Niagara's height, on an undammed river that peaks with the plateau snowmelt.
Mid May through mid July
Big water window
in a typical year
Snowmelt
What drives it
Yellowstone River
Live USGS
Data on this page
gauge 06186500
NPS Yellowstone
Managed by
their rules govern
Trail status, closures and safety rules belong to each falls' managing agency, named and linked on every page.
The season
What fills Lower Falls of the Yellowstone, and when
The Yellowstone is the longest undammed river in the lower 48, and its Lower Falls shows the natural calendar at full scale: the melt off the Yellowstone plateau crests in late May and June at several times the late-summer flow, then the river settles through fall. The Park Service's canyon page urges visiting at different seasons and times of day, and the winter version, viewed by snowcoach with the falls partly frozen, is its own event.
Typical best flow: Mid May through mid July
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What the agency itself says
Experience the canyon from a variety of overlooks, at different times of day, and at different seasons. A number of trails and walkways wind along the rims and down partway into the canyon.
Yellowstone National Park (National Park Service)What a snowmelt year looks like at full send: Palouse Falls in mid April, when the Palouse River is still carrying the melt. The same falls in late August is a ribbon. Timing is most of the visit. “04-15-14-palouse” — Dsdugan — CC0
Source: USGS Water Services (National Water Information System). Instantaneous values and daily statistics services. U.S. Geological Survey data are works of the United States Government and are in the public domain. Gauge verified 2026-08-27.
The other half of the story: the same Palouse Falls in late August. Nothing is wrong; this is what a snowmelt river does every year once the melt is spent. “Palouse Falls 20100829” by Mark Wagner, CC BY-SA 2.5
Getting there
Access, in the agency's words and ours
Overlooks line both rims via North Rim and South Rim drives near Canyon Village, with trails descending partway into the canyon. The Park Service flags the Brink of the Lower Falls and Red Rock Point trails as not recommended for visitors with heart, lung or other health conditions because of the vertical descent and return climb.
The Lower Falls from Lookout Point, photographed by the Park Service. The canyon's yellow rock is hydrothermally softened; the falls survives on a harder ledge upstream of it. “Afternoon fall light on Lower Falls from Lookout Point (54937071695)” — YellowstoneNPS — Public domain
Common questions
Lower Falls of the Yellowstone flow season FAQ
The reliable big-water window is Mid May through mid July. The Yellowstone is the longest undammed river in the lower 48, and its Lower Falls shows the natural calendar at full scale: the melt off the Yellowstone plateau crests in late May and June at several times the late-summer flow, then the river settles through fall. The Park Service's canyon page urges visiting at different seasons and times of day, and the winter version, viewed by snowcoach with the falls partly frozen, is its own event.
This page reads the USGS gauge on Yellowstone River (Yellowstone River at Yellowstone Lk Outlet YNP, upstream of the falls, at the Yellowstone Lake outlet) live in your browser, and shows the latest flow next to the median USGS publishes for today's date, so you can see where today sits in the year. The gauge reads the river, not the brink, so treat it as the trend rather than a turnstile.
Never; this is a major river in every month. The seasonal contrast is still dramatic: the gauge at the lake outlet reads over a thousand cfs in late August against multi-thousand spring peaks, and the falls' sound changes with it.
Yellowstone National Park (National Park Service). Overlooks line both rims via North Rim and South Rim drives near Canyon Village, with trails descending partway into the canyon. The Park Service flags the Brink of the Lower Falls and Red Rock Point trails as not recommended for visitors with heart, lung or other health conditions because of the vertical descent and return climb. Trail status, closures and safety rules are theirs, and their page is linked on this one; nothing here overrides what they publish.
In their own words: "Because of the amount of vertical descent (and returning ascent), these trails are not recommended for visitors with heart, lungs, or other health conditions: Brink of the Lower Falls Trail, Red Rock Points Trail" That sentence is Yellowstone National Park (National Park Service)'s, quoted verbatim, and their page is the place to check before you go.
Yosemite Falls in May, running on snowmelt that will be gone by late summer. The National Park Service tells visitors the falls can be dry by August, which is why every falls page here starts from its watershed. “Tourists below Yosemite Falls (39832011431)” by Mike McBey, CC BY 2.0
The 132 foot drop framed by volcanic pinnacles whose Thomas Moran painting helped establish Yellowstone itself in 1872, a short walk from the Tower General Store.
Flow windows are typical-year climatology drawn from the driver and the agency language quoted above, not forecasts. Live readings and per-date percentiles are U.S. Geological Survey data, public domain; the above-or-below-typical line is our comparison and is labelled as such. Access, trail and safety information belongs to Yellowstone National Park (National Park Service). National picture: waterfall season across the US → Hero image: “Afternoon fall light on Lower Falls from Lookout Point (54937071695)” — YellowstoneNPS — Public domain
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