Altitudinal migrant. In late spring, after their young fledge, Clark’s Nutcrackers move upslope to subalpine habitats of whitebark pine and limber pine. They migrate back downslope in the fall, or earlier if the whitebark and limber pines have poor cone crops. Occasionally, when cones are especially scarce, large numbers of nutcrackers will move longer distances within or outside of their normal range. They have shown up as far away as Pennsylvania and central Ontario.