The Rim Fire has threatened two groves of giant sequoias that are unique in the region, prompting park employees to clear brush and set sprinklers around the huge trees.
While sequoias have a chemical in their bark to help them resist fire, they can be damaged when flames move through slowly.
More top news
A 14-year-old girl who died after falling ill in a PE class has been named locally as Kiera Beagle.
A man has broken his arm diving out of a coffee shop window after mistaking a disturbance on the ground floor for a terrorist attack.
The newly appointed manager dipped into his famous reserves of self-confidence in his first TV interview since his arrival at Old Trafford.