How Many Leaves Are On A Full Grown Oak Tree? Leaf Math

Big oak tree in park with early spring green leaves

When oaks trees are fully covered in leaves, you may wonder just how many leaves they have. They grow quite old, sometimes over 100 years easily and, some species over 1000. Let’s answer the question of how many leaves are on a full grown oak tree and more amazing facts.  

A full grown oak tree can have anywhere from thousands of leaves up to even 1 million leaves. Oak trees are considered fully grown at 30-40 years. To get the approximate number of leaves on your tree, measure the width of the oak under the crown. For every 25 feet, oak trees have approximately 30,000 leaves.

Read on to find out facts you will want to know about your full-grown oak tree, including tree/leaf maintenance and identifying oak trees!

Just to add – when you shop using links from Tree Journey, we may earn affiliate commissions if you make a purchase. As an Amazon Associate, we earn from qualifying purchases.

How Do I Measure My Oak Tree To Know How Many Leaves Are On It?

So, to actually measure your oak tree and understand just how many leaves that you may have to rake up when they all fall, you’ll first need to actually MEASURE your oak tree.

To do this, you’ll ideally want a soft measuring tape as opposed to a hard one so it will wrap accurately and tightly around your oak tree. A good soft measuring tape option is LAND’s Open Reel Fiberglass Tape Measure which will give you more than enough room to measure your tree.

Next, you’ll want to take the measuring tape and wrap it around the thickest part of the trunk near the base of the tree. You won’t want to measure all the way at the bottom of the trunk near the ground, but somewhere near chest level for you.

You can also get a ladder and measure directly in the middle of the tree but, this isn’t really worth it unless you need the most accurate measurement possible.

To measure your oak tree to see how many leaves it has, wrap your soft measuring tape around the tree to get it’s total circumference. Divide the total feet by 25ft, and multiply that number by 30,000. This will give you a rough estimate of how many leaves you have on your tree.

For example, if your oak tree is approximately 26ft around the trunk of the tree, your oak tree may have around 31,200 leaves.

You could additionally do this will ALL the oak tree on your property, and learn just how many rakes you’ll need to get this year!

With that being said, now is a great time to mention our guide on oak tree leaves called: How Big Do Oak Tree Leaves Get? Leaf Identification

What Is Special About An Oak Tree?

The grand oak tree is a symbol of great strength and wisdom. A member of the Quercus genus, there are up to 800 different species native to the Northern hemisphere. 

The oak tree is important for both humans and beasts all over the planet. Natural medical practitioners have used its bark in specialized ways for many years.

It yields acorns which is a food source for animals. They find them in large groups, which then provide shelter to many species of animals.

Next time you look at art involving trees–the oak is showcased many times over. A brush on canvas complements the lines and twists of oak trees.

Why Should I Plant An Oak Tree?

The Oak Tree Is A Generational Tree

If you have a property you want to make a garden, something generations to come can enjoy, then any appropriate species of oak fits well. So this is the first reason to plant an oak tree specifically. 

You can buy seeds like the White Oak Tree Seeds for Planting by The CZ Grain Company. It comes with 10 large acorns, which should be stratified for 30-60 days after you receive them. They include a video link and paper instructions with each order as well!

This article, How To Grow An Oak Tree From An Acorn (6 Easy Steps), would also be a fantastic guide throughout your journey. If you decide to plant an oak tree, give it a read!

The reason we are referring to the oak tree as generational is it’s still at the beginning of its lifespan at 30-40 years of age; when humans are middle-aged–the oak tree is just getting started!

This means if you plant it when you are in your 20s or younger, your grandchildren and their kids can enjoy the full-grown oak tree! 

Regardless of when you plant, you may still want to plant them all over the property properly, which we will get into next. Then you can enjoy a full fall color show from the bold and beautiful seasonal leaf turning. 

You Will Enjoy The Fall Leaf Colors

From the very first year, the oak trees show off their colors! Some are more muted and others are brilliant and bright! 

Kids love the memories of playing in the oak leaves!

Oak Trees Can Typically Live 200 Years

Oak tree branch, copy-space background

Around the globe, they have found species as old as 1000 years old. Like this article about the British oak. So you are not only creating history for your family but creating oxygen for the planet and helping the ecosystem greatly. 

They do not have many issues as they grow, but you must take care of them properly. This is especially true if you are planting them from the acorn, which we will get into later. 

They grow healthy and vibrant from the start and even in their last days–a century or more–they stay gorgeous. Yes, identifying a dying tree without a professional can be difficult. 

Oak Trees Provide A Habitat For Many Creatures

If you want to draw creatures to your yard, then for sure, plant some oak trees! Squirrel and deer and the most common of the acorn marauders.

Oak trees attract over 100 vertebrate species of animals in the US.

Some creatures that live in oak trees are:

  • Squirrels- especially flying squirrels and grey or red squirrels.
  • Chipmunks
  • Wood Ducks
  • Blue Jays
  • Crows. 
  • Quails
  • Wild Turkeys
  • Rabbits
  • Raccoons
  • Possums

You can read more about what creatures live in trees in our article: 9 Different Animals And Insects That Live In Trees

Oak Trees Are Fairly Low Maintenance

All you need to do is read up on how to take care of the Oak, and let them grow! There is not a lot you need to do with this practically self-maintaining tree. Infestations or diseases are not something you have to worry much about with oak trees.

Oak tree diseases are not unheard of though. You can learn more about the most common issues here in our article: What’s Wrong With My Oak Tree? 10 Most Common Oak Diseases

How To Maintain An Oak Tree

As we mentioned in the last point, the oak tree does not need a lot of maintenance, but there are some very important things you should do. It is still possible to stunt the growth of your oak tree or harm it in other ways.

  • The Root Zone: The root zone is the area 6 feet from the trunk. If possible, maintain an additional ⅓ of the distance from the edge of the foliage. This area is commonly called the drip line. 

Make sure you keep things off of those areas and do not dig or interrupt them. This is the root zone, which is where food, water, and airflow must be free to feed the tree.

  • Low Pruning Your Oak Tree: The full-grown oak only needs to be pruned in the dry season and to get rid of dead or weak branches. You do not want one of those big heavy things dropping on you or someone else–it’s a lawsuit or worse.
  • Irrigation of your Oak Tree: Go to the outer edge ⅔ the way from the root zone and water the area deeply. To keep the weeds from drawing nutrients and water away from the tree root system–put down organic mulch. 
  • Fertilization: If you have a new tree, you can use fertilization to establish it quicker. Hire a professional to do it properly to make sure the tree stays healthy. 

On the mature oak tree, you will not have to fertilize unless there is unusually poor growth or disease. This TreeHelp Annual Care Kit for Oak is a great place to start with a new tree though. It is a complete care package for all your tree’s needs.

  • Planting around the Oak: Use drought-tolerant plants only. Never plant around the root system or up against the tree. Remember to leave the 6-foot radius around the tree. 

7 Amazing Facts About Oak Trees

Dawn, the young leaves of oak trees covered the first rays of the sun.
  1. Oak trees have two categories.

Oak trees can be considered trees or shrubs. Yup, you heard right. 

This is because they can reach a towering height of 148 feet, which accounts for the tree title. Besides, they look a lot more like a tree than a shrub. 

However, their branches also sprawl out quite far and can have branches from near the ground to touching the sky! 

  1. Oak trees have lived on the planet for 65 million years. 

Their leaves and acorns, which are the hard shell the seed comes in, are coated with tannic acid.

No fungi or any other creepy business lives through it, so they slime on out of there! 

  1. They can live 7-10 centuries! Which is 700 to 1000 years. Could you imagine? On one hand, this is not a long time and on another–it seems like forever compared to the time humans have on the planet.
  1. Oak trees produce 10 million acorns, the hard-shelled nut-like thing that falls from an oak tree. It contains one seed, which becomes a tree in the right conditions. However, the wildlife who enjoy them eat a majority of the acorns.

These acorns can have many amazing uses, which you can read about here: 9 Amazing Fallen Acorn Uses (And What to Do With Them).

Dogs, horses, and other large animals cannot eat them. They can be deadly. 

  1. Oak trees have over 600 species. The Americas, including Mexico, have a good number of these species. Mexico has 160 endemic species, and in North America, there are 90.
  1. Mandeville Louisiana houses the largest oak tree still alive. Professionals have also estimated it to be approximately 1500 years old. So, if it is true, then it knocks out the record for 1000 years.
  1. Wine barrels are made from oak wood because it is the best wood to age wine in. The wood can give a coconut, vanilla, and smoky tinge to the wine. This is a tradition people have carried on throughout centuries.  
  1. Like Truffles with your wine? You have oak trees to thank for them. 

How Do You Identify An Oak Tree?

Autumn. Fall. Autumnal park. Autumn tree.

There are tons of big and amazing-looking trees around. However, many species fall into the oak tree category. If you think you have one or are walking through nature and want to identify one, then do read on! 

You can find oak trees in North America, Mexico, Europe, and Asia, to name a few. Some are deciduous, while others are evergreen or semi-evergreen. Some are trees and some are classed as shrubs. 

They can survive very well in hot tropical or cold climates. They are by far one of the heartiest, if not the absolute hardiest, of all the trees in the tree kingdom. Sort of the green king of the jungle. 

Red And White Oaks

The first step is to identify which oak trees are growing in your region. Let’s use North America as an example here. 

Here, you would look for two types of oak trees. The red and the white oak tree. 

For the red oak, you would look for darker bark like a tanner color and lobed leaves, which come to a point sort of like a maple leaf. Though oak leaves are skinnier than maple. 

The white oak has a lighter bark with more rounded lobes. Between the lobes lie sinuses. They can be deep or shallow and will give the lobes their character. 

For a more detailed look at these two types of oak tree, consider reading Red Oak vs. White Oak Tree Growth Rate & Key Differences!

Using Leaves To Identify Oak Trees

Some evergreen species are smoother without sinuses and have a more fluid look with little shape.

The branches on an oak will grow from one central location and branch out. The leaves are more spiral from the stem and will never appear flat. 

The geographic region and the appearance of acorns are also important to identify oak trees.

The leaf color should also correspond to the season. The green leaves appear in summer–the red leaves appear in the fall and the brown in winter. This is a great telltale sign you have an oak. 

Of course, match the leaves up with the two possible shapes we mentioned along with the other facts we provided to decide if you have an oak tree.

If it’s in the early spring and you spot pinkish leaves, wait to see if they turn green shortly. This is another way to be sure. 

Oaks love their leaves and hate to part with them. Though you would not know it by the amount of them you may have to rake and bag. However, a young tree will hold its leaf stock well into spring and older trees will still wait until the new tender baby leaves come out.

Oak leaves decay at a much slower rate than other species of tree. They are great for self-fertilization. The oak needs no fertilizer unless something unusual like disease and poor growth happens. By understanding these facts, you will see how incredible this tree is. 

Oak leaves can also vary in size, among other things, and are actually generally targeted by insects of all types. To learn more about what happens, check out our guide: 5 Animals & Insects That Eat Oak Tree Leaves

Why Is There A Decline In Oak Trees?

Oak trees are in decline mostly because of our climate changes causing prolonged droughts. This can cause fires, and soil issues caused by humans moving in on vast territories are the cause for some other factors. 

Typically, apart from a direct hit from fire, oak trees can withstand some of these things, but fungi, infestations, and disease follow. That is just too much for an oak tree. 

We have no affiliation with them, but if you are a tree lover and want to help, you could join a charity of your choice like Save The Oaks who, according to their website, save saplings.

That’s A Wrap!

Well, that’s all we’ve got! We hope you have as much fun identifying and learning about Oak trees as we have teaching you. They are a majestic creation that deserves our reverence and protection. 


Reyes-French, G., & Cohen, T. J. (1991). A Mitigation Process for Impacts of the All American Pipeline on Oak Woodlands in Santa Barbara County. In: Standiford, Richard B., Tech. Coord. 1991. Proceedings of the Symposium on Oak Woodlands and Hardwood Rangeland Management; October 31 – November 2, 1990; Davis, California. Gen. Tech. Rep. PSW-GTR-126. Berkeley, CA: Pacific Southwest Research Station, Forest Service, U.S. Department of Agriculture; P. 255-261126.

Dagit, R., Carlberg, C., Cuba, C., & Scott, T. (2015). Economic incentives for oak woodland preservation and conservation. Gen. Tech. Rep. PSW-GTR-251. Berkeley, CA: U.S. Department of Agriculture, Forest Service, Pacific Southwest Research Station: 457-469251, 457–469.

Light, R. H., & Pedroni, L. E. (2002). When oak ordinances fail: unaddressed issues of oak conservation. In: Standiford, Richard B., et Al, Tech. Editor. Proceedings of the Fifth Symposium on Oak Woodlands: Oaks in California’s Challenging Landscape. Gen. Tech. Rep. PSW-GTR-184, Albany, CA: Pacific Southwest Research Station, Forest Service, U.S. Department of Agriculture: 483-500184.

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