The Roundtop, Maxon-Derby, Sackett, Bates, and Kelso sites have been important sources of information on settlement patterns in New York State during the period A.D. 1000 to 1400, ever since Ritchie and Funk’s classic 1973 publication Aboriginal Settlement Patterns in the Northeast. Based on these sites, it has been accepted knowledge that large longhouses were in place by the eleventh to early twelfth centuries A.D. in the upper Susquehanna and Finger Lakes regions. A series of 15 new radiometric and AMS dates from these sites revises this perception, suggesting that longhouses the size of those at Roundtop were not present until the calibrated thirteenth century A.D.