What Is Bourbon? A Straightforward Explanation

Bourbon is America's native spirit — but the word gets used loosely enough in everyday conversation that a lot of drinkers can't confidently say what actually makes a whiskey a bourbon. Here's the straightforward version.

The Short Answer

Bourbon is an American whiskey distilled from a grain mash of at least 51% corn, aged in new charred oak barrels, with no added colouring or flavouring. It can be made anywhere in the United States — not just Kentucky — though Kentucky produces the large majority of it.

Where the Name Comes From

The most widely accepted origin story ties the name to Bourbon County, Kentucky, a major shipping point for barrels of corn whiskey heading down the Mississippi in the early 1800s. The exact history is debated among historians, but the name has been tied to Kentucky corn whiskey for close to two centuries.

The Rules, in Plain English

• Grain: At least 51% corn in the mash bill. The rest is typically rye or wheat (for flavour), plus a small amount of malted barley (needed for fermentation).
• Barrel: Must go into a brand-new, charred oak barrel — never reused. This is a major reason so many other spirits categories (Scotch, Irish whiskey, rum, tequila) age in used bourbon barrels afterward.
• Proof: Distilled to no more than 160 proof, barrelled at no more than 125 proof, bottled at no less than 80 proof.
• Purity: No added colouring, flavouring, or blending agents of any kind — what's in the bottle came entirely from the grain, the yeast, the water, and the barrel.

What Bourbon Tastes Like

Because of the corn-forward mash bill and new-oak ageing, bourbon typically shows vanilla, caramel, and baking spice notes up front, with the depth of oak character growing the longer it ages. Compared to Scotch or Irish whiskey — which almost always use used barrels — bourbon tends to pull noticeably more flavour directly from new wood, which is part of why it reads sweeter and more oak-forward than most other whiskey styles.

A Few Bourbon Terms Worth Knowing

• Straight bourbon: Aged a minimum of two years, no added colouring or flavouring.
• Single barrel: Bottled from one individual barrel, unblended.
• Small batch: Blended from a limited, hand-selected group of barrels.
• Wheated bourbon: Uses wheat instead of rye as the secondary grain, for a softer profile.
• Bottled-in-bond: A stricter quality standard — one distiller, one season, four years minimum, bottled at exactly 100 proof.

Once you know these basics, reading a bourbon label stops being guesswork — every term on it is telling you something specific and verifiable about how the whiskey was actually made.