At the annual Christmas Bird Count, birdwatchers brave cold temperatures and all weather conditions to survey birds in a designated “count circle” on a given day. A count’s survey area stays the same from year to year, comprising a circle fifteen miles in diameter around a central point. International in scope, the Christmas Bird Count is organized and compiled by the National Audubon Society, who coordinates all count circles so they don’t overlap.
New Hampshire Christmas Bird Count Circles - find a circle near you and contact the count coordinator (NH preview provided by NH Audubon)
Other States - coordinated by the National Audubon Society