The Christmas Bird Count (CBC), organized by the National Audubon Society (NAAS), is the longest-running community science bird project in the world, and the 2025-2026 season will mark its 126th year. Far more than a festive birdwatching trip, the CBC is a critical census that provides ornithologists and conservation biologists with essential data on the winter distribution, abundance, and population trends of North American birds.
The 126th Annual Audubon Christmas Bird Count will take place from December 14, 2025, to January 5, 2026.
What is the Christmas Bird Count?
The CBC is an international census of winter birds conducted annually across the Western Hemisphere. Its roots trace back to 1900, when ornithologist Frank Chapman proposed a "Christmas Bird Count" as a conservation-minded alternative to the tradition of "Christmas Side Hunts," where people would compete to shoot the largest number of birds.
The Count Circle Method
Every individual CBC takes place within a designated "count circle" which is 15 miles (24 kilometers) in diameter. These circles are fixed and remain largely unchanged from year to year. Each circle has a designated Compiler, who is an experienced birder responsible for organizing volunteers, coordinating routes, and submitting the final data to the National Audubon Society.
On one specific day chosen by the Compiler within the official three-week period (December 14 – January 5), volunteers follow assigned routes within the circle, counting and identifying every single bird they see or hear. The goal is not just a species tally but an accurate count of the total number of individuals of each species present in the circle that day.
Why the Data Matters
The data collected by tens of thousands of volunteers over more than a century is used by researchers to:
Track long-term population trends: Scientists use the data to see if bird populations are increasing, decreasing, or shifting their winter ranges.
Identify the effects of climate change: Shifts in species' winter distribution can be a direct indicator of climate change impacts.
Inform conservation strategies: The data helps determine which species and habitats are most in need of conservation attention and funding.
How to Get Involved in the 2025 CBC
Participation in the Christmas Bird Count is free, and you absolutely do not need to be an expert birder. Beginners are highly encouraged to join, as they are always teamed up with experienced birders. Your extra set of eyes is valuable, even if you can only spot the movement!
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Here is a step-by-step guide to finding and joining a count:
Step 1: Find a Count Circle Near You
The first step is to locate an official count.
Check the National Audubon Society's official CBC website for an interactive map of all count circles across the US and Canada.
The map typically uses color-coding to indicate participation status: Green or Yellow circles are open for new participants, while Red circles are full.
You can also contact your local Audubon chapter or nature center, as they almost always coordinate a local count.
Step 2: Contact the Compiler
Once you have found an open circle, contact the Compiler via the email or phone number provided on the map pop-up.
Contact them well in advance of the count day (late November or early December is best).
Inform them of your interest and your skill level (beginner, experienced, etc.).
The Compiler will assign you to a field team (for active birding along a route) or, in some cases, a feeder/yard count (for counting birds from your home).
Step 3: Participate as a Feeder Counter
If your home falls within the boundary of a count circle, you can participate as a Feeder/Yard Counter.
This is a great option for beginners, those with limited mobility, or families with young children.
You simply count and record the maximum number of each species you see at your feeders or in your yard on the official count day.
Step 4: Prepare for the Count Day
If you join a field team, plan for a full day of activity, typically starting near dawn and potentially ending after dark (for 'owling' for nocturnal species).
Bring the Right Gear: Binoculars, a field guide, and a notebook/pencil are essential. A spotting scope is helpful but not required.
Dress for the Weather: The count happens regardless of weather. Dress in warm layers, a waterproof outer shell, a hat, and gloves. Warm, waterproof footwear is highly recommended.
Pack Supplies: Bring plenty of water, snacks, and a lunch, as the team may be away from the car for extended periods.
By joining the Christmas Bird Count, you become part of a vital tradition, a massive effort in community science, and gain a memorable way to enjoy the winter season while contributing directly to bird conservation.
