If you’ve ever asked, “What is bourbon?” — you’re not alone.
Bourbon is a distinctly American whiskey with strict legal standards that define how it’s made, aged, and labeled. While often confused with other types of whiskey, bourbon has specific requirements that set it apart.
Here’s exactly what bourbon is — and what makes it different.
What Is Bourbon? (Simple Definition)
Bourbon is an American whiskey made from at least 51% corn, distilled in the United States, and aged in new, charred oak barrels.
To legally be called bourbon, it must:
Be made in the United States
Contain at least 51% corn in the mash bill
Be aged in new, charred oak barrels
Be distilled to no more than 160 proof
Enter the barrel at no more than 125 proof
Be bottled at 80 proof (40% ABV) or higher
Contain no added flavoring or coloring
That’s it. No additives. No shortcuts.
Is Bourbon Only Made in Kentucky?
No — bourbon can be made anywhere in the United States.
While Kentucky produces the majority of the world’s bourbon (thanks to its limestone-filtered water and long distilling history), bourbon is legally defined as an American product — not a Kentucky-only spirit.
Think of it like Champagne: all Champagne is from France, but bourbon is from the U.S. as a whole.
What Is Bourbon Made From?
Bourbon is made from a fermented grain mash. The primary ingredient must be corn (at least 51%), but most bourbons also include:
Rye (for spice and structure)
Wheat (for softness and sweetness)
Malted barley (to assist fermentation)
This grain recipe is known as the mash bill, and it significantly influences flavor.
High-Rye Bourbon
Spicier, drier, more peppery.
Wheated Bourbon
Softer, rounder, often sweeter.
What Makes Bourbon Different From Whiskey?
All bourbon is whiskey — but not all whiskey is bourbon.
Here’s the difference:
Bourbon
Other Whiskey
Must be made in the U.S.
Can be made worldwide
51%+ corn
Varies by style
New charred oak barrels
May use used barrels
No additives allowed
Some styles allow coloring
Scotch, Irish whiskey, Canadian whisky — all different traditions, ingredients, and aging rules.
Why Does Bourbon Taste Sweet?
Tasting bourbon is certainly an art. While corn naturally produces some sweetness, when combined with caramelized sugars from charred oak barrels, you get classic bourbon flavor notes like:
Vanilla
Caramel
Brown sugar
Toasted oak
Baking spice
Dark fruit
The longer bourbon ages, the more influence the barrel has on its flavor profile.
What Is Straight Bourbon?
“Straight Bourbon” means the whiskey:
Is aged at least two years
Contains no additives
If aged less than four years, must state the age on the label
Most premium bourbons are labeled “straight bourbon whiskey.”
What Is Small Batch Bourbon?
“Small batch” is not legally defined.
Generally, it means bourbon blended from a limited number of barrels for consistency or character. Each distillery defines “small” differently.
What Is Single Barrel Bourbon?
Single barrel bourbon comes from one individual barrel — not blended with others.
Because each barrel ages slightly differently, single barrel releases often show more distinct character and variation.
Does Bourbon Have to Be Aged?
Yes — but technically, there is no minimum aging requirement to be called bourbon.
However:
To be called Straight Bourbon, it must age at least 2 years.
Most premium bourbons age between 4–12+ years.
Where Does the Name Bourbon Come From?
The name is widely believed to originate from Bourbon County, Kentucky, named after the French Bourbon dynasty.
By the 1800s, whiskey shipped down the Ohio River from that region became associated with the name “bourbon.”
FAQ: What Is Bourbon?
What is the difference between bourbon and whiskey?
Bourbon is a type of American whiskey made with at least 51% corn and aged in new charred oak barrels.
Does bourbon have sugar added?
No. Bourbon cannot legally contain added sugar, flavoring, or coloring.
Can bourbon be made outside Kentucky?
Yes. It can be made anywhere in the United States.
Is bourbon gluten-free?
While made from grains containing gluten, the distillation process removes gluten proteins. Most experts consider bourbon gluten-free, though those with severe sensitivities should consult a physician.
What proof is bourbon?
Bourbon must be bottled at 80 proof or higher. Barrel proof bourbons can exceed 120 proof.
The Bourbon Concierge Perspective
At The Bourbon Concierge, we focus on sourcing exceptional bourbons worth indulgence, from single barrel selections to rare and highly allocated releases.
Whether you’re exploring your first bottle or seeking a specific vintage expression, understanding what bourbon is — and what makes it unique — is the first step in appreciating the craft behind every pour.
Explore our curated collection of premium bourbons and discover the depth of America’s native spirit.
