Created for Coffee Lovers.

How to Roast Coffee Beans at Home: a Comprehensive Guide

Dave Carter

January 11, 2021

You've probably heard that freshly roasted coffee is far superior to the pre-ground stuff you get in the jars at the grocery store. We are definitely on board with this philosophy! Coffee should be fresh and flavorful and taste like a vacation to your taste buds. But, sadly, it is also one of those things that are sometimes hard to come by unless you live in a big city or know someone who roasts their own beans. Home coffee roasting is a wonderful experience as it allows you to get good control over your roasts by setting the exact time and temperature.

With these little beans, you can create magic that is hard to beat. Whether you are a home roaster or a coffee drinker, single-origin coffee purchased online can give you the roasts you desire. Imagine a freshly roasted bag of coffee beans sitting on your roasting plate, suddenly, you are flooded with an aroma that will bring pleasure to any coffee lover. What's the trick? It's easy! Before they are ground, coffee beans should be cleaned and stripped of their silverskin, (the thin layer covering the bean). Once you master a few steps, it will be easy to turn out perfect roasts every time. This article will teach you how to roast coffee beans at home to create flawless, delicious, and aromatic beans, starting with raw ones. You need just a few tools and products that any kitchen should have on a daily basis. Read on!

(btw. if you are interested in the 10 best coffee machines - click here)

10 Best Coffee Machines

The Best Coffee Machines that You Can Buy Online.
Extensively Reviewed by a Coffee-Enthusiastic.

The Best Coffee Machine Reviews

How to Roast Coffee Beans at Home Without an Oven

Important Things to Know About How to Roast Coffee Beans

So you want to roast coffee beans at home? Great! You won't get a chance to try this very often in most commercial coffee shops. That being said, if you have the passion, we strongly encourage you to consider roasting your coffee. It doesn't matter if you have never roasted before. All that we ask is that you read the instructions carefully, step-by-step on how to roast coffee beans at home.

Roasting coffee beans is a relatively straightforward process, so it's well worth the minimal effort. When it comes to coffee, there are plenty of methods you can use when roasting at home. Many people would love to roast their own coffee beans at home, but they think it's difficult and expensive. At one point, we felt the same way. We didn't know how to roast coffee at home without an oven. We were convinced that we needed special equipment and training to do it. It turned out we were wrong! We came to learn that if you don't have an oven, it is not the end of the world! You can still roast your coffee beans.


Brewing your coffee can be a lot of fun. You get to choose the beans, test out different grinds, and experiment with brewing methods. Consider roasting your coffee beans when you're ready to take things to the next level. If you don't want to invest in a coffee roaster, there are still some ways that you can roast your beans at home without an oven. Here are four methods to roast coffee without an oven.

1. Use a popcorn popper

A popcorn popper can be used to roast coffee beans. It's very similar to using a skillet or frying pan, except you don't have to stir it manually all the time since the machine does that for you. This is a great option if you're looking for something easy, but don't want to use an oven because of its size or other reasons.

2. Use a hot air popcorn popper

A hot air popcorn popper is another alternative method of roasting coffee without an oven. This option is great because it uses hot air instead of direct heat from an open flame like in skillets and frying pans. The downside is that it takes longer than other methods.

3. Use a skillet or frying pan

This is the most common method of roasting coffee without an oven. Using a skillet or frying pan is easy and fast. It's also a very manual process, so you'll need to spend some time learning how to roast coffee beans this way. That said, the results can be great if done right.

What You’ll Need:

  • Coffee beans
  • Cast iron skillet
  • Wooden spoon
  • Metal strainer
  • Cooling rack

Step by Step Guide:

  1. To set up your coffee roaster, fill a large cast-iron frying pan at least 12 inches in diameter with about half an inch of beans and set the heat to medium. 
  2. The beans will begin to expand and take on the appearance of popcorn kernels as they go through the first stage of the roast.
  3. Stir continuously for about 5 minutes until you start to see browning take place, then reduce the heat to low for another 5 minutes or so.
  4. If you are using a gas stove, you may want to move off the hottest part of your burner by turning it down as low as possible - this will help prevent scorching your beans.
  5. Once all your beans have turned golden brown in color, and there are no more popping or cracking sounds coming from them, remove them from the heat immediately!
  6. However, if you want a dark coffee beans roast, return the pan back to medium heat and continue to shake hard until you hear the second crack. 
  7. Turn off the heat 
  8. Transfer roasted beans onto a cooling rack or paper towels laid out on the kitchen countertop using tongs or a wooden spoon handle (not metal!).
  9. If you are not using them immediately, you can store the roasted beans in an airtight container for up to 2 weeks or at room temperature or freeze them for up to 3 months.

How to Prepare your Coffee Beans Before Roasting

The Best Process of Roasting Coffee Beans

The quality of the brewed coffee depends largely on the initial quality of the green coffee beans before roasting. Although the beans’ genetic composition is the most important factor in determining their quality, their origin and the growing conditions also play a major role. The most recognizable coffee varieties used by roasters are Arabica and Robusta. Arabica is known for its fine aromatic qualities, while Robusta is more bitter but has higher caffeine content. The three main factors influencing coffee bean quality are altitude, fertilization and sunlight. The higher the altitude area at which Arabica trees grow, the larger and denser their beans. They will also contain less caffeine.

Too little fertilization can be detrimental to plant growth and production, while an excessive amount can lead to bitterness in the cup. The best approach is to use just enough fertilizer to maintain plant health without overloading them with nutrients. Also, coffee plants need plenty of sunshine for optimal photosynthesis, which leads to heavier fruit production and higher berry yields. So, do you wish to learn how to prepare your coffee beans before storing them? Before roasting and serving coffee, a few steps need to be completed.

Step 1: Inspection

Coffee beans are first inspected for any foreign matter, such as stones and other debris. Then the beans are cleaned either by hand or by machine to remove any seeds or plants that may have been mixed in with the coffee crop. Some coffee beans contain defects that can cause an off flavor in the final product. There are several ways to detect these defective beans. One way is by shaking the beans into a container and listening for the sound of bad beans hitting against each other.

Step 2: Sorting

The next step is to sort out the different beans. They may be sorted according to size, color, density, or shape. Another way is by sorting through the beans one at a time while floating in the water. Defective beans and chaff will float on top of the water because they are less dense than good ones. Good coffee beans will sink to the bottom of the container because they are denser than water.

Step 3: Storing

The coffee beans need to be stored in a ventilated container. Beans absorb moisture from the air, which can cause them to swell and lose their flavor. The water causes the bean to expand and burst, releasing the aromatics inside. This is why roasted beans are often stored in bags that let the air out but not in. To avoid this, store your green coffee beans in a container that lets air circulate but keeps them in the dark place so they don't get too hot. If you live somewhere humid, buy smaller amounts more often, so you don't have to store the beans for very long.

Stored Coffee Beans: How long does it last?

There are a number of variables that contribute to the taste of the coffee. Water temperature, water flow, the coarseness of the grind, and extraction time all play their parts in producing a quality cup of coffee. The essential ingredient is, without a doubt, the coffee beans. Coffee beans are like any other type of food product. While they start as fresh foods, they can go stale and spoil if not stored properly. One thing to note is that coffee beans are not the same as brewed coffee. It is essential to keep in mind that brewed coffee has a much shorter lifespan than roasted beans.

Brewed coffee will usually stay fresh for about twelve hours. After that, it begins to get stale, and eventually, it becomes undrinkable. It is best to drink your coffee within five hours of brewing it, but some people have been known to store it for as long as twenty four hours successfully. Coffee beans are different from brewed coffee in that they don’t go stale nearly as fast. If stored properly, roasted coffee beans can last for months without losing much of their flavor. So, how long does it last when using different storages? This guide will help you to best store your ground or whole bean coffee so that you can keep it fresher for longer and avoid having to buy it more frequently.

Coffee beans are best stored in airtight containers. These containers come in a variety of materials, ranging from glass to metal to plastic. Let us look at each of them in detail as they all affect how long coffee beans last in one way or another.

  •  Glass containers
    Glass or ceramic containers are the most popular options for storing coffee on the kitchen countertop. However, glass is breakable and ceramic isn't airtight. While they don't let any air in, they allow light to pass through, which can affect the quality of your coffee. If you are looking for a long-term storage option that's airtight and durable, then the glass will not serve your purpose as it can only preserve your coffee for a few days.
  • Plastic Containers
    Plastic containers are not recommended as they let in too much oxygen and light. They also tend to absorb coffee's flavor and aroma, which affects the coffee's taste. The best solution is an airtight container or bag that protects from sunlight and moisture.
  • Metal containers
    Metal tins are best used for storing whole bean coffee if you plan on grinding them soon after opening the container. They don't seal as well as plastic or glass jars so they should only be used for short periods of time up to 6 months.
  • Vacuum sealed containers
    Vacuum sealed cans are great at keeping out air and moisture, but only if you plan on using them within a few months. After about 6 months the seal will break down and begin letting in oxygen or carbon dioxide which can affect the quality of your coffee.

Green Coffee Beans: How to Roast in Oven

Different Flavors After Coffee Roasting

It is not the purist's way of roasting coffee, but it is a simple and effective way to go about it. Many people use this method because they don't want to buy a fancy home coffee roaster. Roasting coffee at home is fun, though, so you might want to consider getting a proper roaster if you decide you like it. The goal is to get your beans to bake to the point where they fully express their flavor and aroma potential and with frequent practice you can be out to compete with professional roasters. Here is a step guide of how to roast in oven your green beans.

What You’ll Need:

  • Green coffee beans 
  • Oven mitts or heavy duty gloves 
  • Tray/oven-safe pan 
  • Colander

Directions:

Step 1: 

First, preheat your oven to 500 degrees Fahrenheit of cooking temperature. While it's heating up, fill your colander with water and put it in the freezer. You will use this to cool the coffee beans after they are roasted. Once it's cool enough, place on a layer of paper towels and set aside until you're ready to cool your roasted coffee beans.

 

Step 2:

Once the oven has preheated, remove the pan and add about 1/4 cup of green coffee beans. The beans should be spread out in a single layer. Return the pan to the oven, shaking it slightly so that the beans are evenly distributed across the bottom of the pan.

Step 3:

Set a timer for 8-12 minutes depending on how dark you like your roast, or just watch until they reach your desired color. The beans will go through several stages as they roast. You'll see them go from green to yellow, then tan, then brown, and finally to a dark brown color as they approach their "first crack" stage. If you want your coffee light roast, stop roasting at this point. If you want a medium roast, keep going until you hear your "second crack". If you want a dark roast, continue to roast until the second crack is almost over and then remove immediately but be careful not to over roast as they would burn and lead to a dark smoke rising.

Step 4:

Remove the beans from the oven when they're done roasting and pour into your cooling bin or colander until they are safe to handle with your fingers.

What is the Perfect Temperature for Roasting Coffee Beans?

The perfect temperature for roasting coffee beans can be found by taking into account the volume of the batch, the desired roast level, and the duration of the roast. The perfect temperature used during the roasting process of the green beans is an elusive target. It is a moving target that changes every time you roast because of factors such as bean moisture content, ambient temperature, airflow and altitude. Coffee roasts are divided into categories based on color and flavor profile called roast levels. The darkness of the roast level is primarily determined by how long it is roasted, but also by how hot it gets. The higher the heat during baking, the faster the roast and the more sugars are broken down. The faster the roast, the darker it will get without burning it.

The first five minutes of the roast beans are called the drying phase. The beans don’t undergo much change during this time, but it’s important to make sure that during the drying phase, you drive off all the moisture from inside of the coffee bean. As moisture leaves the coffee bean, it will become porous and brittle and can break apart at any moment. This is known as “first crack”. At this point there are two things that can happen: If you want your beans to be light in color and mild in flavor (think American Roast), then you stop roasting at this point. You have produced a light roast bean. If you want your beans to be darker in color and more intense in flavor (think French Roast), then you continue roasting until you have reached your desired intensity level. You have now produced a dark roast bean. The temperature that you roast coffee beans at can also affect flavor. Higher temperatures will bring out more bitter flavors, while lower temperatures can accentuate sweet flavors.

When you don’t roast your coffee beans at the right temperature, you risk losing some of those precious volatile oils that give us delicious flavors like chocolate or nutmeg! The result can be bitter tasting grounds with very limited aromas - which makes it hard to enjoy.

Is it Cheaper to Roast your Coffee Beans or Buy them?

Methods of Roasting Coffee Beans at Home

A number of people have asked us whether it makes sense to roast our own coffee beans. Like many things, the answer is: it depends! We had a look at the numbers and found that buying roasted beans and roasting your own can be cheaper by about half. Roasting your own coffee beans is probably one of the best things you can do to ensure you get the freshest cup of coffee possible. But it’s not for everyone. If you want to try your hand at roasting your own beans, here’s what you need to know.

There are some savings if you roast your own beans but not enough to justify the time and effort involved in roasting them yourself unless you already roast them and drink enough coffee that the savings are significant over time. Plus there are other factors (like equipment) that may affect cost. Also you should consider whether you want to city roast whole bean coffee or want to grind and brew. Second, what kind of coffee equipment do you need? Third, how much money will it cost to start home roasting? There are a few things that can make or break the decision for you. Whether or not you have a bit of  time for roasting, if you have the space for roasting and if the price is right for your budget. But most importantly, what kind of coffee beans you will buy. The characteristics of the beans will determine if you will have an easy time roasting them yourself.

10 Best Coffee Machines

The Best Coffee Machines that You Can Buy Online.
Extensively Reviewed by a Coffee-Enthusiastic.

The Best Coffee Machine Reviews

Conclusion​

Roasting your own coffee at home can be a fulfilling hobby and a fun way to save money. It is essential to take the necessary steps to roast safely and be aware of the costs associated with roasting large batches of beans. Because it’s challenging to get a uniform roast from batch to batch, this is not recommended for commercial use. Whether you are a beginner or an experienced lover of home-roasted coffee, we hope that this article has provided you with some answers to your questions on how to roast coffee beans at home.

More Posts in this Category:

How to Make a Cappuccino in Your Own Home
Cappuccino Vs Coffee: Classical Differences for these Brews
Cappuccino Vs Latte: Differences that All Baristas Should Know!

Best

Jura E8 Chrome Automatic Coffee Machine TOP 10 Best Coffee Machines

Enjoy an excellent taste with one of our reviewed coffee machines.

Show me the Best Products NOW

Convergentcoffee.com is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com.