9 Reasons Why My Oak Tree Leaves Turning Brown In Summer

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If you’re a nature lover like a gardener and me, you also love and appreciate the oak trees’ natural beauty. But if you notice something unusual, like oak tree leaves turning brown in the summer, you get very worried.

If you are wondering, ‘why are my oak tree leaves turning Brown in summer,’ this article is for you. Since any sudden change in appearance can be concerning for any gardener or landscaper, leading them to worry about what they might have done wrong or not paid attention to with their beloved trees, you should read this article thoroughly.

Here, I’ll explain all the possible reasons why oak tree leaves turn brown in the summer and explore what you can do to treat it. After reading this article, I hope you will learn all the steps you should take to ensure their long-term health and longevity. Let’s first find 9 reasons oak tree leaves turn brown in summer.

9 Reasons Why My Oak Tree Leaves Turning Brown In Summer

9 Reasons Why My Oak Tree Leaves Turning Brown In Summer

If you feel concerned or worried about your oak tree leaves turning brown in the middle of summer, don’t feel so. You should know that it’s not uncommon for oak trees to experience browning during summer, and there are many reasons why this can happen. Here I am giving you nine reasons why my oak tree leaves turn brown in summer.

Environmental Factors

I don’t know if you know this, but drought and heat waves can cause significant stress to oak trees. Any substantial change in the weather might be causing your tree to drop its leaves. This happens when your oak tree tries to conserve water. These environmental factors can also cause leaves to dry out and turn brown.

Diseases And Pests

Being a gardener, you should know that certain diseases and pests can attack oak trees, which might be why oak leaves turn yellow, wilt, and drop. Some of the most common conditions frequently seen in oak trees with improper management & care include oak wilt, oak leaf blister, and oak anthracnose.

Soil And Water Issues

  • Check the soil quality if your oak tree leaves turn brown during summer. It is not uncommon for trees to change their color due to Poor soil quality, compacted soil, and insufficient water. Since all these soil problems can make oak trees struggle to absorb the nutrients and water they need to survive, I recommend you take action as soon as possible. Poor water drainage and waterlogging can also cause oak trees to turn brown and drop in the summer season.

Root problems

Roots are the lifeline of oak trees; check for the sciencedamageatosthemn because damaged roots can have serious consequences. There can be many reasons your oak tree roots can become damaged, like underground utility or soil compaction. Sometimes A tree that is near a construction site also experiences root damage. If not appropriately addressed, it could lead the tree to die.


It is essential only to fertilize your tree when needed. During the summer season, you will need to provide a specific type of fertilization to an oak tree for better growth and thriving. Over-fertilizing oak trees can cause an excess of nitrogen, which can cause leaves to turn yellow and brown. If this is the case, I recommend you drain the soil properly and treat it.


In the summer, your oak trees exposed to too much direct sunlight can suffer from sunscald. During the daytime, if your oak tree leaves are exposed to too much direct sunlight, it will cause them to dry out and turn brown. In this case, I recommend you provide proper shade to your tree. 

Climate change

During the summer season, it is not uncommon to notice a quick rise in temperature on specific days, which can cause oak trees to struggle to adapt and conserve resources. If your region’s climate changes, the temperature will likely be extreme, causing the oak tree leaves to turn brown.

Chemical exposure

You may have used high amounts of chemical fertilizers or herbicides/pesticides, making the soil toxic for trees. Check for signs of chemical exposure that might be causing your oak trees to become stressed and drop leaves.

Due to excessive chemical exposure, it is not uncommon to notice oak tree leaves turning brown during summer. Also, it would be best never to expose a young oak tree to chemical fertilizer, herbicide, or pesticide.

Natural Ageing

Sad to say, but as your oak trees age, they can become less able to handle stress which can directly cause them to turn their leaves brown during summer. This helps them manage stress better in high temperatures and conserves more water. Maybe your oak tree is too old, making it more susceptible to disease.

No matter the reason, you should first find the exact cause and take appropriate action to help you revive oak trees that are turning brown. By identifying the cause and addressing it, you can help your oak tree recover and maintain its health & beauty for longevity. 

Saving Live Oak Tree Leaves Turning Brown In Summer 

Saving Live Oak Tree Leaves Turning Brown In Summer 

Even though it can be heartbreaking to see your beloved oak tree leaves turning brown in the summer, there are several steps you can take to help save your oak tree. Here are nine tips to revive your oak tree and keep its leaves healthy and green

  1. Firstly, you should ensure that your oak tree gets enough water, especially during hot and dry weather. If not, water your oak tree deeply and slowly to make sure the water penetrates the roots better. I also recommend mulching the soil to help preserve soil moisture.
  2. As a regular part of care, you should also consider fertilizing your oak tree with a balanced fertilizer that can help provide the necessary nutrients for healthy growth and revive its leaves. Ensure you follow the manufacturer’s instructions on the fertilizer label for the best results.
  3. As a part of care, you should regularly inspect your oak tree for signs of pests and diseases. If you notice any, take appropriate measures to prevent and treat them. Some common problems and conditions affecting oak trees include oak root fungus, crown rot, bark beetles, and others I have mentioned above.
  4. You should know that regular pruning of an oak tree helps improve its overall health and prevents the spread of pests & diseases. I advise you to prune your oak tree during the dormant season (late winter to early spring) to avoid stress, ‘using my favorite Monty pruning share.’
  5. You should always avoid compressing the soil over the roots of your oak tree as this will prevent water and air from reaching the roots & cause stress.
  6. Also, it would be best never to plant anything under the oak tree’s canopy, as this can directly disturb their small roots, causing crown root rot. Instead, it would be best if you considered planting native species that require little to no water during summer once established.
  7. As I told you, overwatering can cause root rot, so make sure not to water your oak tree too often. You should only water your oak tree if its soil looks dry, crumbly, or, at times, like during a drought.
  8. Ensure your oak tree is planted appropriately with proper sunlight, soil, and moisture. To remind you, oak trees need well-drained soil and at least 6 hours of sunlight per day, so ensure you provide enough.
  9. Lastly, if you are still unsure about how to treat brown leaves in an oak tree during summer or if you suspect that your tree is suffering from a severe pest or disease problem, I will highly advise you to consult an arborist or pest control as necessary.

By following these tips, you can help revive your oak tree and keep its leaves healthy & green. You should always act quickly and provide optimal care, which is the key to saving your oak tree leaves that turn brown during summer.


Why Are My Oak Tree’s Leaves Turning Brown And Falling Off?

As said, there can be several reasons your oak tree leaves may turn brown and fall off in the summer. The most common causes include drought, heat waves, disease, pest infestations, soil or water issues, and a lack of proper care.

How To Prevent Oak Tree Leaves From Turning Brown In Summer?

If you want to prevent oak tree leaves from turning Brown in the summer, consider providing proper watering, soil care, fertilization, protection from pests & diseases, and pruning. All these can help keep your oak tree healthy, and its leaves green if done systematically.

Can Oak Trees Recover From Brown Leaves In Summer?

Yes, oak trees can always & anytime recover from brown leaves in the summer with proper care & management if provided. Firstly you need to address the underlying issue and then take appropriate action while providing adequate care, which helps trees begin to recover and new leaves grow.


As I told you, if your oak tree leaves turn Brown in summer, it can be caused due to many factors like environmental stress, disease, pests, soil and water issues, and more. I highly recommend you be vigilant and identify the root cause of the problem, which will help you revive your oak tree and prevent further damage.

Take proper care, like watering, fertilizing, protecting from pests and diseases, pruning, and other tips mentioned above. You can save your oak tree from the effects of summer stress very efficiently.

I recommend you be proactive and regularly take proper care and management of your oak tree, so it continues to thrive for many years. I tried my best to give you all the information along with the question, ‘why do my oak tree leaves turn brown in summer.’

If you find this article helpful, then consider sharing it. Your share will help many people learn about the cause of tree leaves turning Brown in the summer. Do check our other helpful guides on tree care and management. See you in the next post, till then take care and goodbye.