What Is the Average Lifespan of a Cedar Tree?

Cedars are among the longest-lived trees most people will ever see, and a healthy mature one usually lives for centuries, often 500 to 1,000 years. “Cedar” is a common name shared by several unrelated trees, so the honest answer depends on which one you are looking at.

How Long Each Kind of Cedar Lives

“Average” is a slippery word for trees. Most seedlings die young, so a true average across every cedar that ever sprouted would be tiny. The numbers people quote describe trees that reach maturity, and they show potential lifespan: what a tree can reach if nothing kills it. Typical figures by type:

Only some of these are true cedars. A true cedar belongs to the genus Cedrus in the pine family and regularly grows past 100 feet (30 m).7In Defense of Plants. The Only True Cedars — In Defense of Plants North American “cedars” such as western redcedar, northern white-cedar and incense cedar are cypress-family trees with flat sprays of small scale-like leaves.8USDA Forest Service. Western Redcedar

Deodar and Atlas cedars sold as ornamentals are true cedars. Arborvitae hedges are northern white-cedar. Eastern redcedar is actually a juniper. Check the Latin name on the nursery tag. Cedrus means a true cedar, Thuja means arborvitae or western redcedar, and Juniperus means a juniper sold under a cedar name; incense cedar is Calocedrus. “Japanese cedar” is Cryptomeria japonica, not a Cedrus. If the tag is gone, needles in tufts on short knobby spurs point to a true cedar, while flat sprays of tiny overlapping scales point to a cypress-family tree.

Record trees go far beyond these figures. Many western redcedars in western Washington have been recorded at more than 1,500 years.9Washington State Department of Natural Resources. Identifying Mature and Old Forests in Western Washington Some British Columbia giants are estimated at 2,500 years or more.10Blooma Tree Experts. Western Red Cedar Trees: Complete Care & Growing Guide Japan’s yakusugi cedars on Yakushima often pass 2,000 years, about four times the usual age for their species.11Wikipedia. Yakusugi Lebanon’s oldest protected cedars stand up to 40 meters and are estimated at over 3,000 years.12Kaleela App. The Cedar of Lebanon: A Story of History, Culture, and Resilience

Your own tree will not necessarily match those figures. They describe trees in suitable climates that were never cut, burned or crowded out, so a cedar planted in a poor spot may fall well short. One planted outside its natural range, such as a Cedar of Lebanon in a very wet or very hot region, is more likely to be stressed and shorter-lived than the quoted numbers suggest.

Why Slow Growth Makes Cedars Live Longer

Northern white-cedar was once thought to live only about 80 years.13PubMed Central. The paradox of great longevity in a short-lived tree species Then researchers looked at the Niagara Escarpment cliffs, where slow-growing trees have ring counts up to 1,653 years and estimated ages near 1,890.14PubMed Central. The paradox of great longevity in a short-lived tree species Slow growth produces much stronger wood and costs the tree little to maintain.15PubMed. The paradox of great longevity in a short-lived tree species A tree that adds only a thin ring each year has less new wood, foliage and root to feed, so it can get through poor years. The long-lived cliff trees are often stunted and twisted: old age comes from surviving a hard place, not from being large.

Each tree is also built of semi-independent sections, so one part can die while the rest lives.16PubMed. The paradox of great longevity in a short-lived tree species Strips of live bark can keep feeding a branch even when half the trunk is dead. Old cliff cedars often look ragged yet keep growing, so dead sections are not always a sign the whole tree is dying. What to watch is whether the green foliage shrinks year to year.

Decay is the other half of the story. Slow-grown rings contain more dense latewood, which resists fungi.17Conifers.org. Conifer Longevity Dry sites slow the fungi that rot wood.18Conifers.org. Conifer Longevity Yakusugi cedars grow slowly on poor granite soil and build resin-rich, rot-resistant wood.19Wikipedia. Yakusugi A cedar on thin, rocky ground may therefore outlive a lush one on rich soil.

A fast-growing garden cedar is a different case. Heavy fertilizing and watering speed growth but give softer wood. Splitting tops and limbs are more common on lush growth, and fast-grown wood holds up less well against decay fungi once a wound or broken limb lets them in. Such trees can still live many centuries, but they rarely reach record ages.

What Shortens a Cedar’s Life

Drought and heat do the most documented damage. Hot, dry springs and summers slow western redcedar growth.20Journal of Biogeography. Canary in the forest?—Tree mortality and canopy dieback of western redcedar linked to drier and warmer summers Trees recover within about 3 years if the following years are cooler and wetter.21Journal of Biogeography. Canary in the forest?—Tree mortality and canopy dieback of western redcedar linked to drier and warmer summers When hot, dry years follow instead, recovery stalls and trees can die.22Journal of Biogeography. Canary in the forest?—Tree mortality and canopy dieback of western redcedar linked to drier and warmer summers Death usually followed 4 to 5 years of declining growth, so decline is visible ahead.23Journal of Biogeography. Canary in the forest?—Tree mortality and canopy dieback of western redcedar linked to drier and warmer summers Of the dead coastal redcedars sampled, 80% died during the 2017–2018 heat and drought.24Journal of Biogeography. Canary in the forest?—Tree mortality and canopy dieback of western redcedar linked to drier and warmer summers Incense cedar lost about 23% of trees after drought in California’s Sierra Nevada.25Forest Ecology and Management. Tree mortality following drought in the central and southern Sierra Nevada, California, U.S.

Different cedars face different main threats. Yellow-cedar is dying back where warmer winters with less snow leave roots exposed to freezing.26Forests. Tree-Rings Reveal Accelerated Yellow-Cedar Decline with Changes to Winter Climate after 1980 Eastern redcedar’s bark is under a third of an inch thick, so one surface fire usually kills it.27USDA Forest Service. Bark Characteristics and Fire Resistance: A Literature Survey Incense cedar has thicker bark and better fire resistance.28Fire Ecology. Using Bark Char Codes to Predict Post-fire Cambium Mortality

Insects join in when trees are weak. Bark beetles and wood borers drive dieback in stressed Atlas cedar forests.29Forest Science and Technology. Bark beetle and woodborer insects’ outbreak as a potent driver of Atlas cedar ( Cedrus atlantica (Endl.) Carriere) forests dieback in Aures -East Algeria- Healthy trees can often push beetles back with resin. Holes or sawdust don’t always mean the insects were the original cause, so look at the tree’s overall condition.

In a yard cedar, early warning signs include:

  • A thinning or browning crown over several years
  • New shoots much shorter than in past years
  • Small holes or sawdust in the bark
  • The top dying back first, a common drought sign

Not all browning is a problem. Many cedars shed older inner foliage each autumn, and it turns brown. If the outer tips stay green, that is normal shedding. Browning tips and outer foliage are the warning sign.

Why Young Cedars Often Don’t Survive

Many cedars never reach old age because the start is so slow. Northern white-cedar seedlings take about 10 years to reach 30 cm and 30 years to reach 3 m.30Forest Ecology and Management. Factors affecting the regeneration of northern white cedar in lowland forests of the Upper Great Lakes region, USA That gives deer decades to eat them, so browsing matters as much as seedling numbers.31Forest Ecology and Management. Factors affecting the regeneration of northern white cedar in lowland forests of the Upper Great Lakes region, USA Deer nip the soft tips of young foliage, and a seedling that loses its growing tip each winter may stay the same height for years.

Seedlings sprout under old trees but rarely pass 30 cm on most sites.32Canadian Journal of Forest Research. Origin and early development of northern white-cedar stands in northern Michigan Survivors often grow on rotting logs in gaps where a fallen tree let in light.33American Midland Naturalist. Regeneration Patterns of Northern White Cedar, an Old-Growth Forest Dominant A decaying log lifts a seedling above leaf litter and competing ground plants, giving it light and a moist, soft place to root.

Planted cedars have an easier time than wild ones, since nursery trees skip the most dangerous seedling years. They still need deer protection when young, and water through the first summers to avoid early drought stress. For saplings on your property, fence or cage them until they are above deer height, and give them light rather than deep shade. Leave some fallen logs where seedlings can root.

How to Tell How Old a Cedar Is

Each year a cedar adds one growth ring, so counting rings gives its age. Those rings also record climate. White cedar rings have been read back to 1469 to reconstruct past summer droughts,34Climate Research. Tree ring-reconstructed late summer moisture conditions, 1546 to present, northern Lake Michigan, USA and deodar rings show spring rainfall in Kashmir back to 1723.35International Journal of Climatology. Precipitation reconstruction for the Lidder Valley, Kashmir Himalaya using tree‐rings of Cedrus deodara The oldest trees resist this, though, because hollow centers make them impossible to date exactly.36Washington State Department of Natural Resources. Identifying Mature and Old Forests in Western Washington A count from the remaining wood underestimates the true age. Researchers sometimes estimate the missing rings from the curve of the surviving ones, which is why the oldest trees are described as “estimated.”

On a stump, count from the center outward; a light band plus a dark band make one year. Wide rings mean good years and narrow ones mean drought. Sanding the surface lightly makes them easier to see.

Without cutting, an arborist can take a pencil-thin core with an increment borer. Coring can open a wound, so avoid it on prized trees. Planting records or old photos often give a yard tree’s age more simply. Trunk girth gives only a rough guess that varies by site.

Size is a poor guide. Cliff cedars only a few meters tall can be over 1,000 years old.37PubMed Central. The paradox of great longevity in a short-lived tree species A fast-growing yard tree 2 feet thick may be only a few decades old, while a stunted tree of the same width on a poor site could be much older.

Helping a Cedar Live Longer

Care follows the threats. Because drought stress builds over years, deep watering in long dry spells helps. Water slowly and deeply so moisture soaks into the root zone, rather than sprinkling lightly and wetting only the surface. The roots reach well beyond the trunk, so apply the water under the outer edge of the crown and beyond, not right at the trunk. Begin when a dry spell has lasted for weeks, since the goal is to cut the multi-year stress that weakens cedars.

Thin-barked cedars near grass or brush need fire clearance. Remove dry grass, dead leaves and low brush from around the base, because a low surface fire is what kills thin-barked trees. Pruning off the lowest dead branches limits the chance that a ground fire climbs into the crown. This matters most for eastern redcedar and in dry regions where wildfires are common, and less for a cedar in a damp, mowed lawn.

A yearly checkup helps: compare crown fullness with last year’s photos, mulch the root zone but keep mulch off the trunk, and avoid digging or compacting soil over the roots. If decline lasts more than a season, call a certified arborist.

If you are choosing a cedar to plant, pick a species suited to your local rainfall. True cedars need room for their 30 m height. Arborvitae suit cold, moist sites. Plant away from structures so the tree never needs heavy pruning.