Be Prepared! Tire Chains or Cables May Be Required in the Parks at Any Time
All vehicles must carry chains or cables when entering a chain-restricted area. It's the law (CA Vehicle Code, Section 605, Sections 27450-27503). Road conditions may change often. For road conditions, call 559-565-3341 (press 1, 1). More »
Vehicle Length Limits in Sequoia National Park (if Entering/Exiting Hwy 198)
Planning to see the "Big Trees" in Sequoia National Park? If you enter/exit via Hwy. 198, please pay close attention to vehicle length advisories for your safety and the safety of others. More »
Giant Sequoias and Fire
Photo by Nate Stephenson
The Giant Sequoia (Sequoiadendron giganteum) is truly the most awesome species in the Sierra Nevada ecosystem. As in other living communities, sequoia groves - and the mixed conifer forests that contain them - have evolved with and adapted to natural processes that must continue if the community is to remain healthy. Fire is one of the major processes essential to the health of giant sequoia groves.
In the early 1960s, Dr. Richard Hartesveldt explored the connection between fire and sequoia regeneration. His small-scale prescribed fires followed nearly a century of fire suppression, and resulted in the germination of sequoia seeds and the recruitment of sequoia seedlings - something that had not occurred in the absence of fire.
Since those first experiments, researchers have further shown the benefits to sequoias from fire. Dendrochronology has determined that low intensity surface fires swept through the big trees approximately every 5 to 15 years. Sequoias rely on fire to release most seeds from their cones, to expose bare mineral soil in which seedlings can take root, to recycle nutrients into the soil, and to open holes in the forest canopy through which sunlight can reach young seedlings.
Sequoias also need fire to reduce competition from species such as white fir (Abies concolor) and Incense cedar (Calocedrus decurrens), which are shade-tolerant and able to recruit seedlings in heavy litter and duff. Fire suppression has resulted in heavy accumulation of forest litter and the encroachment of thick stands of white fir and incense cedar, both of which compete with sequoias for water and nutrients. A natural fire cycle thins these competing species, and provides suitable conditions for sequoia growth.
Return to the Fire and Park Resources page to read some of the research papers that have been written on fire and Giant Sequoias.
Did You Know?
The road to Cedar Grove is closed from November to April because of rockfall, not snow. Erosion can bring rocks tumbling at any time of year, but the threat is greatest in winter. This is when the freeze-thaw action in the rocks tend to start rockslides. More...