If you drive up to Idyllwild on the 243 from Cabazon, you will pass a pond that is optimistically named "Lake Fulmor". If you hike the trail around the lake (can't be more than a mile), you will see a number of big conifers along the shoreline. They are all giant sequoias - placed there by the forest service after the last big fire.
Not only are sequoias highly fire resistant, they actually require fire in order to seed. Their cones won't open unless cooked by flames. It is a unique adaptation that allows sequoia seeds to colonize open forest after it has been cleared by fire. The big trees have bark that can be 36" thick.