After the heavy snows of the last month, I was curious about the condition of one of the best trails for mid-winter conditioning, Mt Si. On this clear but windy and cold day, the trail was in great shape and free of all signs of snow up to 2500'. Beyond that point, the snow became steadily deeper, until by 3000' the trail was hard-packed snow and ice. At the basin below the Haystack, the snow appeared about 3-4' deep, and the steady gusts of wind encouraged only a brief stay, despite the bright sunshine.
Because of the heavy traffic on this trail, snow quickly is compacted into ice in the upper portion of the trail. Ski poles and crampons are highly recommended to navigate the icy higher reaches just below the basin. Four-point in-step crampons are the ideal tool for this hike in the winter.