Pacific gray whales are experiencing what environmental groups characterize as a catastrophic mortality event driven primarily by climate change impacts on their food supply. As sea ice melts around Alaska, the whales lose access to critical feeding areas during their annual migration between Baja California and Arctic waters. The population has declined sharply from an estimated 20,000 individuals in 2019 to fewer than 13,000 currently, with mortality rates appearing to accelerate.
Scientists estimate between 2,500 and 8,000 whales died during 2025 and early 2026, meeting the formal definition of a catastrophic mortality event. Determining precise numbers is challenging because marine biologists can only observe whales that strand on shore. The average annual strandings from 2006 to 2023 was 43, but this figure rose to 179 in 2025, with 146 carcasses counted through the first half of this year. Research suggests the actual offshore death toll may be 7 to 25 times higher than observed strandings.
Beyond climate-related food depletion, multiple other factors contribute to the decline. Ship strikes, oil spills, microplastic pollution, and algal blooms all pose threats. Indigenous hunting operations in Russia also harvest whales annually, though advocates argue the practice exceeds subsistence needs. Stranded whales examined by researchers show signs of starvation and collision injuries. A Noaa marine biologist noted the environment may now be changing faster than the population’s historical ability to recover.
Environmental organizations have petitioned the National Oceanic and Atmospheric Administration to relist gray whales under the Endangered Species Act, a designation they lost in 1994 following successful conservation efforts that brought them back from near-extinction. Some voluntary measures have shown promise, such as California’s ship speed reduction zones, which have cut whale strike deaths by approximately 50 percent. However, similar programs have not been implemented in Oregon, Washington, or Alaska due to shipping industry opposition. The petition response is expected later this month, with advocates indicating legal action may follow if the current administration declines protection.
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