From the ArcaMax Publishing, Gardening Newsletter:
http://www.arcamax.com/news/gardening/s-2634-728261
After frost dig and store dahlias. Dig tubers, cut back stems to 6 inches tall, and dry outdoors. Hang tubers upside down for 2 weeks, then store in moistened peat moss in slatted boxes in a 35F to 50F basement.
This news arrived on: 09/28/2008