The Backyard Feeder Census is no longer held.
However, you can participate in Project FeederWatch which is a winter-long survey of birds that visit feeders at backyards, nature centers, community areas, and other locales in North America. Feeder Watchers periodically count the birds they see at their feeders from November through early April and send their counts to Project FeederWatch. FeederWatch data help scientists track broadscale movements of winter bird populations and long-term trends in bird distribution and abundance. Go to feederwatch.org for more information.
Historical Backyard Feeder Census Data