Breeds on coastal lowland tundra. On Amchitka Island (and likely other low-lying, nonvolcanic Aleutian Islands), nests in Empetrum-Cladonia tundra, sedge-meadow tundra found in lakes and pond regions with little relief, and riparian meadow characterized by dense lush stands of herbaceous vegetation . In early autumn, birds reported in heath tundra of Amchitka Island (Gill et al. 2002).
Gill, R. E., P. S. Tomkovich, and B. J. McCaffery. 2002. Rock sandpiper (Calidris ptilocnemis). In The Birds of North America, Vol. 18, No. 686 (A. Poole and F. Gill, Eds.). Philadelphia: The Academy of Natural Sciences; Washington, D.C.: The American Ornithologists’ Union.