It lasts about ten minutes, requires a cloudless sky, a solar angle precise to the millimeter and a sufficient layer of snow. If even one of these conditions were missing, the show would not take place. Yet every year, in February, thousands of people gather in Yosemite Valley, in Yosemite National Park in California, armed with tripods and telephoto lenses pointed towards the east face of El Capitan, waiting for the so-called waterfall of fire.
The phenomenon has a sober name, Yosemite Firefall. The waterfall in question is the Horsetail Fall, a seasonal watercourse that descends along the granite rock of El Capitan, a phenomenon that occurs only in the presence of previous and abundant winter precipitation. The rest of the year the wall is dry, as we can see in the image above.
Because water looks like fire
The explanation is purely optical, but no less fascinating. Towards the end of February, the setting sun reaches such an inclination that it hits the waterfall almost in a horizontal direction. The grazing light, filtered by the atmosphere, turns towards the orange and red shades typical of twilight. The water falling along the dark rock captures and reflects that light with a particular intensity, and the visual result is that of a stream of incandescent lava flowing down the wall.
It’s not just any seasonal coincidence. The geometric alignment between the position of the sun, the shape of El Capitan, and the path of the waterfall is so specific that it occurs only in that window of a few days, and only under the right atmospheric conditions. Overcast skies mean show cancelled.
When to go and how to organize yourself
The time window is roughly mid to late February. Sunset, in that period, falls around 5.45pm-6pm local time, and the chromatic effect lasts a maximum of a quarter of an hour before the light disappears completely.
Horsetail Fall is located on the east slope of El Capitan, in Yosemite Valley. The most convenient parking to reach the observation point is the Yosemite Falls Parking, near the Yosemite Valley Lodge: from there you can walk about two and a half kilometers on foot. Alternatively, a free shuttle is available from Yosemite Village Park or Curry Village Park to the Lodge.
From 2026 the park has eliminated the booking requirement that was introduced in 2023 to manage overcrowding, but has simultaneously introduced changes to traffic in the area. Northside Drive is partially closed to vehicles to make room for pedestrians; Along Southside Drive, parking and pedestrian traffic are prohibited in some sections. On busy weekends, total traffic closures near the observation area may occur immediately after sunset.
