The fire started on 9 September after a lightning strike, and soon broke off into two separate areas - the Paradise and the Colony fires - which currently cover the territory of a total of 7,039 acres (26 square kilometers), the park said.
"The KNP Complex [wildfire], ignited by lightning on the night of September 9, grew significantly yesterday. The complex is comprised of the Paradise Fire and the Colony Fire. Sequoia National Park is closed to the public, and employees that reside inside the park have been evacuated," the park administration stated.
The wildfire is now threatening to spread to the area where giant sequoias grow. The adjacent Kings Canyon National Park remains open, but the air quality has likely deteriorated, according to the administration.
Fresh reports from the area indicate that firefighters are still struggling to contain the fires as the difficult terrain limit access to the affected areas.