We provide a preliminary assessment of the ground-dwelling arthropod community composition in six common coastal dune ecosystem land cover-types at Cape Cod National Seashore. We captured 6815 individual arthropods representing 16 arthropod orders from 1008 terrestrial pitfall trap-nights. The most abundant orders were Hymenoptera, Diptera, Araneae, and Isopoda (76.1%, 8.5%, 5.5%, and 3.3% of total captures, respectively). There were differences in ground-dwelling arthropod community composition among the three early-successional and the three later-successional cover types, with the latter having a greater overall arthropod diversity and higher capture rates for a number of the major arthropod taxa captured. Our report is among the first communitywide analyses of arthropod community composition in coastal dune ecosystems of the northeastern US. The results from this study should be viewed as a preliminary assessment given that: 1) we employed a single trapping method (i.e., pitfall traps); 2) traps were only open during the late-afternoon to early morning hours, and only during the summer months; and 3) captured arthropods were classified only to order. We hope our report will inspire additional research of coastal dune arthropod communities.