A common worry is that a full moon will ruin the Northern Lights. The good news: a bright moon does not stop you seeing the aurora — a moderate or strong display shines straight through moonlight. It only slightly dims very faint auroras.
How moonlight actually affects the aurora
Moonlight reduces contrast, so a faint arch is harder to spot on a full-moon night. But medium and strong displays are unaffected — and the moon beautifully lights up the snowy landscape for photos.
The upside for photography
Moonlight illuminates foreground snow, trees and mountains, giving your aurora photos depth and a natural glow that a pitch-black night can't. Many photographers actually prefer some moon.
Should you plan around the moon?
Don't over-plan around it. Clear skies and solar activity matter far more than moon phase. If you're chasing the very faintest auroras or the Milky Way too, aim for a new moon — otherwise, come whenever suits.