Researchers used satellite imagery and modeling from previous fires to determine that between 7,500 and 10,000 of the towering species perished in the fire.
That equates to 10% to 14% of the world's mature giant sequoia population, the newspaper said.
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These trees have lived for thousands of years.
They've survived dozens of wildfires already," said Christy Brigham, chief of resources management and science at Sequoia and Kings Canyon National Parks.
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"One-hundred years of fire suppression, combined with climate change-driven hotter droughts, have changed how fires burn in the southern Sierra and that change has been very bad for sequoia," Brigham said.
Sequoia and Kings Canyon have conducted controlled burns since the 1960s, about a thousand acres a year on average.
Brigham estimates that the park will need to burn around 30 times that number to get the forest back to a healthy state.
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