December flips Washington from quiet to festive almost overnight. The storm watching hush of November gives way to twinkling lights, and the whole state leans into the season. Leavenworth becomes the headline act, a Bavarian village wrapped in more than half a million lights, but it is far from the only show. Cities string up their displays, the Christmas ships sail their nightly parades across Puget Sound, and zoos and gardens glow after dark. If November was about leaning into the gray, December is about leaning into the light.
It is also when winter finally arrives in the mountains. The snowpack that started building on the passes in November reaches resort depth, and one by one the ski areas open: Crystal, Stevens Pass, the Summit at Snoqualmie, Mission Ridge, and Mount Baker spin up their lifts as soon as the snow allows. Whether you ski, ride, snowshoe, or just want to sled with the kids and drink cocoa afterward, December is opening weekend for the whole snow season. East of the Cascades the cold is dry and the powder light, while west of them it is wetter and warmer, but the high country still delivers.
The trick to a Washington December is to plan around the weather and the dark. Daylight bottoms out around the winter solstice, with the sun down before 4:30, so the lights do a lot of the heavy lifting. Mountain passes can close or require chains on short notice, Leavenworth weekends get busy, so book a room early, and the coast still gets its winter storms. Dress for cold and wet, keep an eye on the forecast, and December pays you back with the most festive, sparkling version of the state there is.