We report measurements made on eight corncobs (Zea mays) excavated in the 1890s from Pueblo Bonito, Chaco Canyon, New Mexico. Seven of these corncobs were analyzed previously in a geochemical study aimed at determining the locations of the fields in which they were grown. We report radiocarbon dates obtained on these seven corncobs. Comparing the morphologies of the eight corncobs with other archaeological samples of corn from the San Juan Basin supports observations that Pueblo Bonito cobs are larger and have more kernel rows than some other basin samples. The radiocarbon dates preclude the possibility that these seven corncobs represent modern or historic period maize. The dates presented do not support a previous interpretation that there was a change over time in the locations where this corn may have been grown. Not ruling out other possibilities, the dates obtained, the special characteristics of this corn, and its presence in older rooms in Pueblo Bonito argue for continued use of Pueblo Bonito for special purposes over many centuries. In Pueblo belief, as among many indigenous agricultural cultures of the Americas, corn is an important source of sacred power.