Can You Double Roast Coffee Beans?

Roasting your own coffee is an experimentative and exciting process especially when you are brand new to roasting.

There are so many variables that come into play during each roast: temperature, time, bean size, and technique to list a few.

It only becomes a matter of time before you end up with a roast that is inconsistent – some beans are darker than others, or the entire batch might be under-roasted.

Alternatively, you may have purchased some roasted beans that aren’t as dark as you’d hope.

Ultimately this leads you to ask yourself.

“Can I double roast my coffee beans?”

And if you can

“Should I?”

In this article I will explore if roasting your coffee beans twice is something you should do and if you botch a roast are you able to salvage it?

Can you roast coffee beans a second time?

While you can roast your coffee beans a second time, it will not help produce more flavor.

Rather, it will result in a flavor that is bitter, burnt, and even smokey.

Why does this occur?

This generally occurs because the chemical reactions that take place during the initial roast are caused and driven by the moisture content in the beans.

During the second roast, the beans don’t have any moisture content remaining as it has all been stripped away during the first roast.

This leaves you more likely to just smoke the beans rather than develop any further internal taste, running the risk of erasing the flavors from the coffee beans.

I’d report that the taste of coffee that has been re-roasted would taste worse, if not the same as coffee that has become stale.

I would advise you against serving double roasted coffee to your guests.

Can you re-roast under-roasted coffee beans?

For whatever reason, your batch of coffee beans has come out under-roasted and you want to salvage it if you can.

As a general rule, if you botch a roast, there is no saving it…


Depending on when you notice it being under-roasted can be the deciding factor.

If you notice you’ve under-roasted the beans before they’ve had a chance to cool down, throw them back on the pan, in the oven, or back in the machine (whatever your roasting method is) and you might have a chance at salvaging them.

This ultimately comes down to a bit of luck, as if too much time has passed allowing the beans to cool off, you run the risk of the chemical reaction not taking place and burning out the flavor of the beans.

If you notice you’ve under-roasted your beans and they have cooled down, I advise not re-roasting them.

As described above, double roasting more often than not doesn’t end well for the coffee drinker.

In saying this, you should try it out yourself to find out.

The next time you under-roast a batch, re-roast it and see how it tastes, you might find the flavor enriching and enjoyable but if you are like me, you might not.

What is the process of roasting coffee beans?

Roasting coffee beans sounds like a simple process but it takes many attempts to perfect and initially when beginning you will end up with under-roasted, over-roasted, and completely botch batches.

Don’t be disheartened, eventually, you will master the art of roasting and be able to brew a delicious coffee.

The roasting process can be simplified into 3 parts.

  1. Picking the beans.
  2. Roasting the beans.
  3. Storing the beans.

Picking the beans

Fresher is better.

Fresh Green Coffee Beans

The first thing you should look for when selecting coffee beans is their color, fresh coffee beans are a nice green color, if you notice any browning, find another batch.

The second thing you need to look for is the consistency of the bean size in the batch, ensuring the beans are all similar sizes (I prefer larger coffee beans).

Having the beans all the same size lessens the chance of you having an inconsistent roast as they should all crack at approximately the same time.

Roasting the beans

Choosing how you want to roast your beans comes down to a few different factors: Equipment, time, and what you are most comfortable with.

Pan Roasting

Pan roasting requires an open flame, a stovetop will do, and a non-stick pan or cast-iron skillet.

Typically taking 10-15 minutes for a quality roast.

However, I do recommend roasting outside as pan roasting coffee beans can get a little smokey.

Oven Roasting

Oven roasting is one of the most effective methods of roasting (aside from a coffee roaster machine) as it gives an even heat distribution across the beans.

Throw your beans and evenly spread them across your cookie tray, giving them a stir every couple of minutes, and within 5 – 10 minutes, you’ll have nicely roasted beans.

Popcorn Roasting

If all you have is a popcorn popper, you are still in luck.

Although they aren’t designed for roasting you might find your roasts inconsistent, this is due to the uneven heat distribution across the beans.

Place your beans into the popper, ensuring a continuous stir until they begin to move on their own. 5 to 10 minutes later and your coffee beans should be roasted, how evenly is dependent on the machine.

Air Fryer Roasting

Air fryers are not only the healthy alternative to deep frying they can also double up as a coffee roaster.

It’s great if you prefer a medium roast as achieving a dark roast without setting it a-light is very difficult.

Throw your beans into the basket, allow the air fryer to circulate the hot air roasting your beans in approximately 10 minutes.

I’ve written a detailed guide on using an air fryer to roast your coffee beans for better results.

Coffee Roaster

Not everyone has a coffee roaster at home but if you are serious about your roasting this is an investment you should make.

Giving directions for coffee roasters is difficult as each model operates differently, so reading the instructions is needed.

Generally, the process is easy, 7 minutes and you will have a very even roast across all your beans assuming they are the same size.

Storing the beans

Proper storage of the beans will make sure all your roasting efforts don’t go to waste.

Placing your beans into an airtight container to keep in all the gases and storing them in a cool place will keep them freshest for the longest.

Not following this will cause your coffee beans to become stale much quicker than they normally would.


Can you roast your coffee beans twice?


Should You?


Roasting for a second time doesn’t enhance any of the characteristics or flavoring and results in spoiling the flavor of the coffee.

Avoid roasting double roasting, save your time and frustration, just grab another bag of fresh coffee beans and try again.