How To Dry And Store Used Coffee Grounds: Dry In Oven And Microwaves

How To Dry And Store Used Coffee Grounds?

Coffee is one of the world’s most popular drinks, and it’s not uncommon to find people at any time of day making a cup.

Whether you are brewing a pot for yourself or your office mates have gone ahead and brewed for everyone, the coffee grounds will eventually need to be disposed of. But then, how to dry out used coffee grounds? 

It is not hard to research ways on how to properly dispose of or how to dry coffee grounds; some methods may even seem more convenient than others.

But what you need to do is find a method that works for you and your lifestyle and environment. So, in this article, we will learn how how to dry coffee grounds in oven, how to dry coffee grounds in microwave and how to dry out used coffee grounds.

Let’s get started!

Coffee grounds are not suitable for brewing coffee twice. There are many other uses. They are as follows:

How do you dry out used coffee grounds?
  1. Making compost for your garden
  2. Weeding in soil that is being prepared for planting flowers, vegetables, grass, and trees
  3. Adding as own personal fertilizer to plants
  4. Protecting plants from diseases and pests
  5. Reducing the number of molds in your home or office (if you keep it dry)
  6. Cleaning stains on furniture or carpeting (If you have a wet/dry vacuum cleaner)
  7. Cooking with (Dry Method)
  8. Coffee grounds can also be used as a mulch in flowerbeds around the neighborhood.
However, we are not always able to utilize coffee grounds immediately. Storing them for a little while is the solution.

This guide will help you do that:

  • How to dry used coffee grounds.
  • How to store used coffee grounds.

How to dry out Used Coffee Grounds

Drying used coffee grounds can be done in two different ways:

  1. The Sun
  2. In an Oven

Drying Used Coffee Grounds In The Sun:

Drying used coffee grounds in the Sun:

In order to dry coffee grounds in the sun, you will need:

  • Baking sheet or any other similar container (wide but not tall)
  • Dry newspaper/paper sheets
  • Sunlight

This process is fun and easy

Drying in the sun does not require much of your attention for a prolonged period of time. Instead, you can just place coffee grounds in the sun and leave them there for a couple of days.

The drying process for coffee grounds typically takes between two and four days.

If you live in an area with strong winds, consider leaving coffee grounds inside your home.

If you favor keeping coffee in the sun (like we do), it might be advantageous to follow these steps:

  • Line the baking sheet with newspaper or paper sheets (this will enable you to clean coffee grounds from the baking sheet easily)
  • Place coffee grounds on the baking sheet
  • Remember to turn the grounds around so that wet ones on the bottom of pot can be on top
  • If it is wet, change the paper and put a dry sheet instead
  • Bring the coffee grounds inside barring it starts to rain or if it gets too harsh

How to dry coffee Grounds In Oven

How do you keep coffee grounds from going Mouldy?

This method is perfectly suited for those who are short on time and don’t like to leave plastic items in sunlight for too long.

In order to dry coffee grounds in the oven, you will need a:

  • A baking sheet
  • Dry newspaper/paper sheets
  • An oven

This process is much faster but requires more attention and efficiency. When drying coffee grounds, make sure you don’t burn them.

The oven should not be at more than 200 degrees. If your oven is electric, it should not be on the highest setting. It can stay on the medium or lower setting.

If you don’t have a lot of grounds to dry, you can even place them in the oven right after switching it off.

The grounds can be left in the oven overnight to dry. However, this might not work if the quantity of the grounds is more.

Below mentioned are the steps you need to follow on how to dry coffee grounds in Oven:

  • Place coffee grounds on the baking sheet
  • Pre-heat the oven at a temperature of a maximum of 200 degrees
  • Put the baking sheet in the oven
  • Turn the coffee every half an hour to facilitate the even spreading of the heat among the

How To Store Used Coffee Ground?

Once the coffee beans are nicely dry, we recommend carefully preserving coffee grounds to avoid humidity.

We recommend storing coffee grounds in a cool, dark place in airtight containers.

When storing used coffee grounds, consider two factors – their container and their storage place. Your goal should be to find containers that are easy to open, close, and carry.

You can use the below-mentioned types of containers for storing dried or unused coffee grounds.

  • Plastic containers
  • Glass containers
  • Vacuum sealed bags

How Long Can I Store Used Coffee Grounds?

How long can you save used coffee grounds?

The period of time before you use these used coffee grounds again depends on the conditions in which you are storing the grounds.

The more frequently they are exposed to air and humidity, the shorter their lifespan will be.

The life of dried coffee grounds is usually between six months and a year. After that period, the bacterium in them will start to grow, which will develop very quickly once it is exposed to moisture and heat.

Pros And Cons Of Sun Drying

What are the advantages of sun drying method?


  1. It is healthy and sustainable because the heat from the sun makes your coffee grounds dry out, which prevents mold growth.
  2. The process does not require any further attention from you, and you can just wait for the drying to finish in its own time.
  3. There are no chemicals or preservatives needed for drying your coffee grounds.
  4. Drying coffee by the sun helps preserve the flavor of your beans (which can happen with microwaving).
  5. It is a free and natural method of drying food.


  1. Sun-drying coffee grounds can take an extremely long time, in some cases even up to several days.
  2. It requires UV light, which may be harmful to your skin and eyesight when you have to perform the activity outside for a prolonged period of time.
  3. Leaving coffee grounds in the sun might not work if it’s windy or rainy, which may happen more often than expected or desired.

Pros And Cons Of Oven Drying

What are the disadvantages of oven drying?


  1. It is a fast and efficient method for drying used coffee grounds, giving you the ability to store them in airtight containers.
  2. It is an easy-to-use method of drying used coffee grounds, which makes it very suitable for people who have limited time to dry their used coffee grounds.
  3. It is a quick and simple process of drying used coffee grounds that can be performed in the comfort of your own home or office.
  4. Drying coffee grounds in the oven gives you the ability to control the process of drying, as well as temperature.


  1. Temperature control can be challenging in an oven because there is always a possibility that your house will overheat while you are gone or asleep.
  2. The smell of used coffee grounds can be very unpleasant and even dangerous if it develops fungus or bacteria, which makes it unsuitable for storing them at home or at work.
  3. If you are drying coffee grounds in an oven that is electric, the temperature will be extremely high for a long period of time and can cause a fire hazard.


1. How to dry coffee grounds in microwave?

In a hurry and need to dry your used coffee grounds quick? Place the used coffee grounds on a microwave safe plate and cover with cloth, then put in microwave for 2 minutes. Remove and let cool before transferring to a paper bag.

2. How to dry used coffee grounds in oven?

Preheat oven to 200 degrees F (93 degrees C). Spread the used coffee grounds evenly on a greased baking sheet and bake for 20 minutes or until dry. Let cool and then transfer to a paper bag or another airtight container.

3. How to dry coffee grounds in food dehydrator

Run your food dehydrator and set temp to 120 degrees F. Spread the used coffee grounds evenly on a tray and place in the middle of the dehydration chamber. Let it run until completely dry, which should be around 8 hours.

How do you store used coffee grounds so they don’t mold?

It is up to you if you want to store your used coffee grounds in airtight containers. However, it is better to leave the containers inside a cool, dark place so that space does not remain for humidity. In addition, an airtight container prevents the coffee beans from absorbing any new flavors from the container or anything else surrounding the beans. Moreover, it helps them keep an aroma from being released.

Can you dry out coffee grounds and use them again?

Yes, you can use dried coffee grounds for coffee again. This can be done by placing a small amount of dried coffee grounds in your fresh coffee and mixing it at the end. If you are planning to use dry coffee grounds for your ground coffee, then add it to the grinder or clean it first or else the used coffee grounds will leak into your drink.

Is it best to keep ground coffee in the freezer?

When it comes to storing ground coffee, you can either place it in a plastic freezer bag or in a glass container. However, if you choose to go with the latter, be sure to use only those that fit in your refrigerator. Also, keep in mind that the container used for the storage of frozen coffee grounds should have an airtight seal so that moisture does not get inside.

Can used coffee grounds grow mold?

No, used coffee grounds will not grow mold in the refrigerator. In fact, you can keep them in there for months without any damage occurring to your coffee beans or ground coffee.

Why should I save my coffee grounds?

Used coffee ground is a great way of keeping your coffee beans fresh and also a nice addition to your home. In addition, used coffee grounds make an excellent compost for your garden if you are not using it for the preparation of potpourri or flower arrangements.

Do used coffee grounds still have caffeine?

They do have about 4 to 9mg of caffeine . Although this number is lower compared to their original dry form, it is still a considerable amount of caffeine.

Is coffee good for garden soil?

Yes, coffee is considered to be a good ingredient for your garden soil. It can attract earthworms and other organisms that help in the decomposition of the dead leaves, which leads to the creation of topsoil.

Can you store coffee grounds in a Mason jar?

Yes, you can store coffee grounds in a Mason jar. However, you should make sure that it is tightly sealed to prevent any moisture from seeping inside which can lead to the development of mold.

Conclusion: How To Dry And Store Used Coffee Grounds

How do you explain a conclusion?

So, did you find the answers for your questions on “how to dry coffee grounds?” and “how to dry coffee grounds in oven or the microwave?” 

If you are looking for a way to preserve the flavor of your coffee beans and want to keep them fresh for a long time, then the sun is the best option.

However, you should not choose it if your environment is not very good for being in direct sunlight.

Furthermore, if you are drying only a small amount of coffee grounds or you need them right away, it might be better to use an oven. 

There are also ways to dry your coffee grounds without using oven or microwave. However, for those methods to be effective, you should know how long you must leave your beans in the sun to dry them.

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