While firefighters are “aggressively attacking” the fires to help suppress them, the blazes have the potential to affect the park’s infrastructure and resources, the park’s website said. Giant sequoias — which can reach heights of 300 feet — have already been hit hard by fires in the state in recent years: “Two-thirds of all giant sequoia grove acreage across the Sierra Nevada has burned in wildfires between 2015 and 2020,” the National Park Service says.