Changes to Some Opening/Closing Dates for Services and Facilities – Check Back for Updates
Some of the opening/closing dates for facilities and visitor services in the parks have changed due to weather and/or other circumstances. See link for details and match to locations on the park map (under "Park Tools," bottom left, this page). More »
Road Conditions (Entire Park) and Road Construction Delays (if Entering/Exiting Hwy. 198)
Expect 20-minute to 1-hour construction delays on main road through parks (Generals Hwy) until Memorial Day weekend (7 a.m.-6 p.m.). See link for schedule. Call for 24-hour road conditions info: 559-565-3341 (press 1, 1, 1). More »
Vehicle Length Limits Have Changed in Sequoia NP (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 new vehicle length advisories for your safety and the safety of others. More »
You May Have Trouble Calling Us. Use the "Contact Us" Link (Bottom Left) to Send an E-mail.
We are experiencing technical problems receiving some incoming phone calls at the parks. We apologize for the inconvenience. Please keep trying to reach us or check this website for frequently-asked questions. The search box (top, right) may be helpful.
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 record high temperature in the foothills of Sequoia National Park is 118 degrees F, reached in July, 2007. Three times in the last decade it has hit 114 degrees. Is this one sign of global warming?