6 Hubbard Glacier Facts: A Breathtaking Natural Wonder in Alaska

Hubbard Glacier, a magnificent tidewater glacier located in eastern Alaska and part of the Yukon Territory in Canada, is a breathtaking natural wonder. Named after Gardiner Hubbard, the first president of the National Geographic Society, this glacier is known for its impressive size, active calving, and beautiful blue ice. 

In this article, we will explore the fascinating facts about Hubbard Glacier, including its formation and growth, calving and icebergs, visiting opportunities, and its importance to the surrounding ecosystems and scientific research.

1. Overview

Hubbard Glacier is a tidewater glacier, meaning it flows from its source in the mountains to the sea, where it calves icebergs into the ocean. Located within the boundaries of Wrangell-St. Elias National Park and Preserve in Alaska and Kluane National Park and Reserve in the Yukon Territory, Hubbard Glacier, offer stunning views and unique opportunities for visitors to witness the power and beauty of nature.

2. Size and Location

Spanning over 76 miles in length, Hubbard Glacier is the longest tidewater glacier in North America. Its face, where the glacier meets the ocean, is approximately 6 miles (10 km) wide. The glacier’s immense size and its location within two national parks make it an awe-inspiring sight for those who have the opportunity to visit.

3. Formation and Growth

Hubbard Glacier was formed through the accumulation and compaction of snow over thousands of years. As the snow accumulates and compresses, it transforms into ice, which flows downhill under the force of gravity. 

Unlike many glaciers worldwide that are retreating due to climate change, Hubbard Glacier has been thickening and advancing since it was first mapped in the 1890s. This unique behavior is attributed to its large accumulation area and a favorable climate for glacier growth.

4. Calving and Icebergs

Calving is the process of ice breaking off from the face of a glacier, a natural part of a glacier’s life cycle. Hubbard Glacier is known for its active calving, producing numerous icebergs each year. These icebergs can be as large as multiple-storied buildings and can pose a threat to nearby marine traffic.

Notable calving events in Hubbard Glacier’s history include a massive iceberg calving in 1986, which temporarily dammed the Russell Fjord and created a large lake. As seen in the below video, a YouTuber captured a massive calving event in 2010 at Hubbard Glacier.

5. Visiting Hubbard Glacier

Hubbard Glacier is a popular tourist destination, with many cruise ships and tour boats visiting the area during the summer months. Visitors can witness the glacier’s impressive size, active calving, and beautiful blue ice up close. In addition to boat tours, visitors can explore the surrounding national parks for hiking, wildlife viewing, and other outdoor activities.

6. Importance of Hubbard Glacier

Hubbard Glacier serves as an essential source of fresh water for the surrounding ecosystems, supporting a diverse range of plant and animal life. Its unique behavior of advancing rather than retreating provides valuable information for scientists studying climate change and glacial dynamics. 

Additionally, the glacier’s beauty and accessibility make it an important destination for tourism, contributing to the local economy and raising awareness about the importance of preserving natural wonders.


Hubbard Glacier is a breathtaking natural wonder that showcases the power and beauty of nature. Its impressive size, active calving, and unique advancing behavior make it a fascinating subject for both tourists and scientists alike. 

As a vital source of fresh water and a popular tourist destination, Hubbard Glacier is crucial in supporting the surrounding ecosystems and local economy. By learning more about this incredible glacier and its importance, we can better appreciate and protect the natural wonders that our planet has to offer.