What Is Fat Bear Week?
Fat Bear Week is an annual public voting competition celebrating the brown bears of Katmai National Park and Preserve in Alaska. The event highlights how the bears spend the summer feeding heavily on salmon and building the fat reserves they need to survive winter. Rather than being a contest about beauty or appearance, the competition is closely connected to bear biology, seasonal feeding, survival, and the health of the Katmai ecosystem.
Fat Bear Week began in 2014 as a much smaller event and has grown into an internationally followed wildlife celebration. The National Park Service, Explore.org, and the Katmai Conservancy work together to make the event available to people around the world.
In 2026, Fat Bear Week takes place from September 22 through September 29, with voting during the tournament and the champion announced on September 29. The National Park Service says the bracket is revealed before the competition begins, allowing the public to follow the head-to-head matchups.
When Did Fat Bear Week Start?
Fat Bear Week originated in 2014 at Katmai National Park. According to the National Park Service, park ranger Mike Fitz noticed a comparison posted by a fan of the Brooks River bear cameras showing the dramatic seasonal change in one bear's body size.
The idea developed into Fat Bear Tuesday, a one-day public voting event held in September 2014. Voting originally took place through Facebook likes. The event became more popular and expanded into the first full Fat Bear Week in October 2015.
Since then, the competition has developed into a recurring annual event that combines wildlife education, live webcams, public voting, and information about the ecology of Katmai National Park.
Where Does Fat Bear Week Take Place?
Fat Bear Week focuses on brown bears living around Brooks River in Katmai National Park and Preserve in Alaska. Brooks River is an important feeding area because large numbers of sockeye salmon travel through the river system.
The salmon provide an important seasonal food source for brown bears. During summer and early autumn, bears take advantage of this abundance to build energy reserves before winter.
Although people around the world participate online, the bears themselves remain wild animals living in their natural environment. The competition is a digital celebration of animals that visitors can also observe through official bear webcams.
Why Do Bears Get So Fat Before Winter?
For brown bears, gaining substantial body fat before winter is a survival strategy. Bears enter a period of intense feeding known as hyperphagia, during which they consume large amounts of food and build energy reserves.
Those reserves are important during winter denning. While in their dens, bears dramatically reduce their activity and rely on stored energy. The National Park Service notes that bears can lose up to one-third of their body weight during winter.
This makes the apparently unusual focus on large body size biologically meaningful. A well-fed bear has accumulated energy that can help it survive the months when food is unavailable or difficult to access.
What Is Hyperphagia?
Hyperphagia is a period of intense feeding that occurs before winter dormancy. Bears spend much of the warmer months searching for calorie-rich food and consuming enough energy to build substantial fat reserves.
At Katmai, salmon provide an especially valuable source of calories. Bears may spend long periods near rivers and streams where salmon are concentrated.
The seasonal abundance of salmon allows bears to consume large quantities of food in preparation for winter. Fat Bear Week takes place at the point in the year when these physical changes are particularly visible.
How Does Fat Bear Week Work?
Fat Bear Week uses a bracket-style tournament. Selected bears compete against each other in head-to-head matchups, and members of the public vote for the bear they believe has done the best job preparing for winter.
Each round narrows the field until one bear becomes the Fat Bear Week champion. The competition is designed to encourage people to learn about the individual bears and the ecological conditions that allow them to thrive.
The exact tournament schedule and bracket can change from year to year. For the 2026 event, the National Park Service announced that the bracket would be revealed on September 18, with voting taking place September 22 through September 29 and no voting on the weekend.
Who Chooses the Fat Bear Week Winner?
The public chooses the winner through online voting. People from around the world can participate when voting is open.
The competition is therefore not a scientific measurement of which bear is objectively the heaviest. It is a public wildlife celebration in which voters select their preferred contestant in each head-to-head matchup.
The educational value comes from learning why the bears become large, how they interact with their environment, and why the salmon-rich ecosystem is important to their survival.
How Are the Bears Selected?
Fat Bear Week features recognizable brown bears that live around Brooks River and are frequently observed by park staff and through the bear webcams. Individual bears are identified using numbers and, in some cases, nicknames.
Examples from previous competitions include bears such as 480 Otis, 435 Holly, 747, 409 Beadnose, 128 Grazer, and 32 Chunk.
The field changes over time because the bear population is dynamic. Younger bears mature, established bears change behavior, and different individuals become more visible to observers.
Does Fat Bear Week Measure the Heaviest Bear?
Not necessarily. The competition is a public vote rather than an official weighing contest. Voters often consider photographs showing how dramatically a bear has changed over the summer and how well it appears to have prepared for winter.
The National Park Service presents the event as a celebration of the bears' seasonal transformation and the healthy ecosystem that supports them.
The physical size of a bear can vary by sex, age, genetics, reproductive status, food availability, and individual behavior. A larger bear is not automatically the winner or necessarily the most biologically successful individual.
Why Are Salmon Important to Fat Bears?
Salmon are a key seasonal food source for the bears of Katmai. Sockeye salmon migrate through the region in large numbers, providing bears with energy-rich food at a critical time of year.
The connection between salmon and bears illustrates how ecosystems operate as interconnected systems. Healthy salmon populations support bears, while bears are part of a wider network of plants, animals, rivers, and nutrient cycles.
The National Park Service describes the salmon runs in the Katmai and Bristol Bay region as fundamental to the ecosystem that supports the area's brown bears.
Why Is Katmai National Park Important for Brown Bears?
Katmai provides extensive habitat for brown bears and contains highly productive salmon streams and rivers. The park protects a large, relatively intact ecosystem in which bears can feed, reproduce, raise cubs, and prepare for winter.
Brooks River is especially well known because bears gather there to feed on salmon. This concentration of wildlife has also made the area an important location for scientific observation, conservation education, and wildlife viewing.
Fat Bear Week helps introduce this ecosystem to an international audience that may never visit Alaska in person.
Why Did Fat Bear Week Become So Popular?
Fat Bear Week combines several elements that work well for online audiences: recognizable individual animals, live webcams, dramatic seasonal transformations, a simple voting format, and a competition that can be followed over several days.
The event also provides an accessible way for people who may not have a background in wildlife biology to learn about hibernation, salmon ecology, bear behavior, and conservation.
The visual nature of the bears' seasonal transformation makes the concept particularly easy to understand. People can compare photographs from earlier and later in the year and see how dramatically a bear can change before winter.
How Many People Participate in Fat Bear Week?
Participation has grown substantially since the event began. The National Park Service reported that more than 1.7 million votes were cast from more than 100 countries during the 2025 competition.
Previous years also attracted large international audiences. The growth of the event has been supported by online voting, social media, live bear cameras, educational resources, and widespread interest in wildlife.
The voting numbers demonstrate the reach of a wildlife education program that began as a small local event.
What Is Fat Bear Week 2026?
Fat Bear Week 2026 runs from September 22 through September 29. The National Park Service announced that the bracket would be revealed on September 18 and that the champion would be crowned on September 29.
The 2026 competition is particularly timely for people searching for the event because voting begins on September 22. The National Park Service also encourages viewers to watch the live bear cameras and learn about the individual bears before and during the competition.
As with previous years, the event connects public voting with education about Katmai's brown bears and the ecosystem that supports them.
Who Won Fat Bear Week 2025?
Bear 32, nicknamed Chunk, was crowned the 2025 Fat Bear Week champion. The National Park Service reported that more than 1.7 million votes were cast during the competition from more than 100 countries.
Previous champions include several well-known Katmai bears. The Hall of Champions maintained by the National Park Service records past winners and provides information about the history of the competition.
Who Are Some Famous Fat Bear Week Champions?
Several individual bears have become especially recognizable through the competition. Bear 480 Otis has won multiple times, while 435 Holly, 409 Beadnose, 747, 128 Grazer, and 32 Chunk have also become prominent figures in Fat Bear Week history.
These bears are identified by numbers because individual identification is important for following their lives and behavior over time.
The popularity of particular bears can also encourage people to learn more about bear behavior rather than viewing the animals only as competitors in an online contest.
What Is Fat Bear Junior?
Fat Bear Junior is a related competition featuring younger bears. It gives audiences an opportunity to follow the growth and development of cubs and adolescents.
The junior competition emphasizes that growing bears also undergo major physical changes as they develop the skills and body reserves needed for life in the wild.
The schedule for Fat Bear Junior can differ from the main Fat Bear Week tournament, so participants should check the current official schedule before voting.
Can You Watch the Bears Live?
Yes. Explore.org provides live webcams that allow viewers to watch bears at Katmai without traveling to Alaska. These cameras have played an important role in the popularity of the event because viewers can observe bears during the summer salmon season.
Live cameras can show bears fishing, resting, walking along the river, interacting with other bears, and using different parts of their habitat.
The cameras also help people understand that the bears are wild animals with individual behaviors rather than simply characters in an online competition.
Why Does Fat Bear Week Matter for Conservation?
Fat Bear Week helps draw attention to the ecological conditions that allow Katmai's bears to thrive. The bears need abundant food, healthy waterways, suitable habitat, and functioning ecosystems.
When people learn why bears become fat before winter, they also learn about salmon runs, rivers, seasonal food availability, reproduction, competition, and wildlife habitat.
The event therefore provides an accessible entry point into broader conservation topics. The popularity of the competition can introduce millions of people to a national park and its ecological systems.
What Happens to the Bears After Fat Bear Week?
The bears continue preparing for winter after the competition ends. They eventually retreat to dens or sheltered areas as winter conditions develop and food availability decreases.
The competition itself has no biological effect on the bears. The animals do not know that people are voting for them, and they do not receive a physical prize for winning.
The real biological objective remains the same: accumulate enough energy to survive the winter and successfully emerge when conditions improve.
Do Bears Actually Win Anything?
The winning bear does not receive a conventional physical prize. Fat Bear Week is a public education and awareness event rather than a competition that provides a reward to the animal.
The value of the event is in the attention it brings to the bears, the salmon ecosystem, Katmai National Park, and wildlife conservation.
From the bear's perspective, the important outcome is having access to sufficient food and habitat to survive and reproduce.
Why Is Being Fat Healthy for These Bears?
In this specific seasonal context, substantial fat reserves are an important adaptation for surviving winter. Bears depend on stored energy during the period when they are inactive in their dens and food is not readily available.
Fat is therefore not simply a measure of appearance. It is an energy reserve accumulated during a season of abundant food.
The amount of fat a bear gains can be influenced by food availability, age, sex, reproductive status, individual behavior, and other biological factors.
How Much Weight Can a Bear Lose During Winter?
The National Park Service states that bears may lose up to one-third of their body weight during winter. The exact amount varies among individuals and depends on factors such as their initial condition and reproductive status.
This seasonal loss helps explain why bears spend so much time feeding before entering their winter dens.
Fat Bear Week takes place when the bears have accumulated much of these reserves, making their seasonal transformation particularly visible.
What Makes a Brown Bear Look Different in September?
A bear's appearance can change substantially between early summer and autumn. Increased body fat can make the animal's body appear wider and rounder, while thick fur can also contribute to its overall appearance.
Photographs from different times of year can therefore show a dramatic transformation. This before-and-after effect is one of the reasons Fat Bear Week photographs are so popular.
However, photographs do not provide an exact measurement of body mass. Perspective, posture, lighting, fur, and camera position can all affect appearance.
How Does the Fat Bear Week Bracket Work?
The bracket places selected bears into head-to-head matchups. Each matchup gives the public an opportunity to vote, and the bear receiving enough votes advances according to the tournament structure.
The bracket format makes the event easy to follow because the number of competitors decreases with each round.
The final matchup determines the champion after the preceding rounds have eliminated other contestants.
Can Anyone Vote in Fat Bear Week?
The competition is designed for public participation and attracts voters internationally. Voting is conducted online through the official Fat Bear Week platform during the scheduled voting period.
Voting availability and procedures can change, so participants should follow the current instructions provided by the official Fat Bear Week website.
The National Park Service encourages people to use the event as an opportunity to learn about the bears and their ecosystem while participating in the competition.
Why Are Individual Bears Given Numbers?
Numbers make it easier for researchers, rangers, visitors, and viewers to identify individual bears. Many bears also receive nicknames that become associated with them over time.
Individual identification allows observers to follow changes in behavior, age, family relationships, physical condition, and seasonal habits.
For Fat Bear Week audiences, the numbers and nicknames make it possible to follow the same animals across multiple years.
What Can People Learn From Fat Bear Week?
Fat Bear Week can teach people about brown bear biology, salmon migration, seasonal feeding, winter dormancy, wildlife behavior, ecosystem health, and conservation.
The event also demonstrates how technology can connect people with wildlife. Online webcams allow viewers to observe a remote Alaskan ecosystem without physically entering the bears' habitat.
The combination of entertainment and education has helped the event reach audiences far beyond Katmai National Park.
How Does Salmon Abundance Affect Bears?
Salmon provide a concentrated seasonal source of food for bears. When salmon are abundant and accessible, bears can consume large amounts of energy-rich food during a relatively short period.
The relationship is part of a broader ecological system. Salmon support bears and other wildlife while connecting freshwater and marine environments through their migration.
A healthy salmon run therefore has significance far beyond the bears featured in Fat Bear Week.
Why Is Katmai's Ecosystem Important?
Katmai's ecosystem contains rivers, lakes, forests, wetlands, coastal environments, salmon populations, brown bears, and many other species. These components interact in complex ways.
The success of the bears depends on the availability of suitable habitat and food. The visibility of Fat Bear Week provides an opportunity to explain those ecological relationships to a global audience.
Protecting ecosystems such as Katmai helps preserve the natural processes that support wildlife populations.
How Can You Follow Fat Bear Week 2026?
People can follow the official Fat Bear Week competition online during the September 22ā29, 2026 voting period. The National Park Service also recommends checking the park's resources and the live bear cameras to learn about the individual bears.
The official event information provides the current bracket, voting details, bear profiles, and competition updates.
Because dates and voting procedures can change between years, current official information should be used rather than relying on old articles or social-media posts.
Why Has Fat Bear Week Become a Global Internet Event?
The event began as a small park activity but benefited from the growth of online wildlife cameras and social media. People could watch the bears in real time, learn their identities, compare their seasonal changes, and then participate in the competition from anywhere.
The concept is also easy to understand. Two bears compete, the public votes, and one advances. At the same time, the event provides a gateway to more complicated subjects such as ecology, animal behavior, seasonal adaptation, and conservation.
This combination of accessible storytelling and real wildlife science has helped Fat Bear Week attract a large international audience.
Final Conclusion
Fat Bear Week is an annual wildlife competition centered on the brown bears of Katmai National Park and Preserve in Alaska. It began in 2014 as Fat Bear Tuesday and expanded into a full week-long competition in 2015. Today, the event combines online voting, bear webcams, wildlife education, and conservation awareness.
The reason the bears become so large is not simply appearance. They spend the summer feeding heavily, particularly on salmon, and build fat reserves that help them survive winter. The seasonal transformation is a visible example of how animals adapt to changing food availability and environmental conditions.
In 2026, Fat Bear Week runs from September 22 through September 29, with the champion scheduled to be crowned on September 29. The National Park Service says the event has attracted participation from more than 100 countries, demonstrating how a wildlife program in a remote Alaskan national park has developed into a global online event.
Ultimately, Fat Bear Week is about more than choosing a champion. It gives millions of people an opportunity to learn about brown bears, salmon, winter survival, Katmai National Park, and the importance of healthy ecosystems.
