A 125-foot curtain across the Cumberland River, and one of the few places on earth that reliably produces a moonbow.
March through May
Big water window
in a typical year
Rain fed
What drives it
Cumberland River
Live USGS
Data on this page
gauge 03404000
Kentucky State Parks
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 Cumberland Falls, and when
A big river fall that runs year round and roars in spring. The other calendar here is lunar: the moonbow appears on clear nights around the full moon, which is a schedule the park publishes rather than a weather forecast.
Typical best flow: March through May
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What the agency itself says
Known as the Niagara of the South, the 125-foot curtain of water falling into a boulder-strewn gorge is dramatic day or night. But it is only during a full moon that you can see the moonbow, a phenomenon not found anywhere else in the Western Hemisphere!
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.
Rain-fed falls carry the color of their watershed: Blackwater Falls runs amber with tannin from spruce and hemlock bogs upstream, and its volume tracks the last month of Appalachian weather. “Blackwater Falls (15437499241)” by Benjamin Smith from United States, CC BY 2.0
Getting there
Access, in the agency's words and ours
Overlooks are a short walk from the parking area, with trails to further viewpoints.
Cumberland Falls. On clear nights around the full moon this is one of the few reliable moonbows on earth. “Cumberland Falls rainbow” by James St. John, CC BY 2.0
Common questions
Cumberland Falls flow season FAQ
The reliable big-water window is March through May. A big river fall that runs year round and roars in spring. The other calendar here is lunar: the moonbow appears on clear nights around the full moon, which is a schedule the park publishes rather than a weather forecast.
This page reads the USGS gauge on Cumberland River (CUMBERLAND RIVER AT WILLIAMSBURG, KY, upstream of the falls) 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.
No. The Cumberland is a substantial river; the falls runs in every season.
Cumberland Falls State Resort Park (Kentucky State Parks). Overlooks are a short walk from the parking area, with trails to further viewpoints. Trail status, closures and safety rules are theirs, and their page is linked on this one; nothing here overrides what they publish.
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
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 Cumberland Falls State Resort Park (Kentucky State Parks). National picture: waterfall season across the US → Hero image: “Cumberland Falls rainbow” by James St. John, CC BY 2.0
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