Yosemite moonbows visible this season

Yosemite’s moonbows are one of those things that sound made up until you see the recipe. You need a bright moon instead of the sun, a lot of waterfall mist, and the right viewing angle. Then a rainbow shows up at night. That’s the draw this season — and the useful update for 2026 is that the main remaining window is late May into early June, while weaker snowpack and early melt may shorten the season. ### What is a moonbow, exactly? A moonbow is just a rainbow made by moonlight. The physics are the same — light bends and reflects inside tiny water droplets — but moonlight is so much dimmer that the bow often looks pale or silvery to your eyes. Cameras usually pull out more color than your naked eye will. Yosemite’s version happens in waterfall spray, especially around Yosemite Falls when spring runoff is still strong. (yosemitemoonbow.com) ### Why does Yosemite get them? Because Yosemite has the right combination of big spring waterfalls, open sightlines, and lots of mist. The National Park Service points visitors to full-moon nights during peak waterfall season, especially April through June, when Upper and Lower Yosemite Falls can throw enough spray into the air to make the effect visible. Lower Yosemite Fall’s viewing area is a known spot because it’s close to the mist and easy to reach on a paved loop. (nps.gov) ### What’s the actual 2026 window? For this season, the remaining prime window is May 28 through June 3, 2026. A Yosemite moonbow guide run by photographer Brian Hawkins also listed earlier windows around March 31 to April 4 and April 29 to May 5, and says he does not expect a late-June prediction this year because many falls may be drying up earlier than usual. That part matters — if you were thinking “I’ll just go later,” 2026 may not be forgiving. (nps.gov) ### Why is timing so picky? The moon has to be bright and low enough in the sky, the waterfall has to be throwing enough mist, and the sky has to stay clear. One widely cited rule of thumb for Yosemite moonbows is a full or nearly full moon at an angle of 42 degrees or lower. Basically, the geometry has to line up. Too little mist, too much cloud cover, or a moon that’s too high, and the effect disappears. (yosemitemoonbow.com) ### Where should you stand? Usually near Lower Yosemite Fall if you want the most straightforward shot. Hawkins’ 2026 guide points to the footbridge closest to the base of the falls on the Lower Yosemite Falls Trail as the most common viewing and photography spot. That lines up with the Park Service highlighting the Lower Yosemite Fall viewing area as a moonbow location during high flow. (yosemitemoonbow.com) ### Will it look colorful in person? Maybe, but don’t expect the same saturation you see in long-exposure photos. The Park Service says moonbows can look gray to the unaided eye, while photos make the colors pop. Give your eyes time to adjust — 20 to 30 minutes away from white light helps — and don’t keep checking your phone if you want the best chance of actually seeing the arc. (yosemitemoonbow.com) ### What’s the catch this year? Water flow. Yosemite’s waterfalls are seasonal, and 2026 looks less generous than a huge snow year. Hawkins says a dry winter and unusual warmth in March pushed snowmelt earlier, which could leave many waterfalls dry by late June. That doesn’t kill the season now, but it does make the current window feel more urgent. (nps.gov) ### Bottom line If you want a Yosemite moonbow in 2026, the smart play is simple — go during the May 28 to June 3 full-moon window, head for Yosemite Falls, and don’t wait for summer. (yosemitemoonbow.com)