Barrel strength bourbon — also called barrel proof or cask strength — is bottled at the same proof it comes out of the barrel, without adding water to lower the alcohol. That makes it more potent and intensely flavored than standard bourbon, often between 110 and 130+ proof.
How it's different from standard bourbon
After aging, most bourbon is "proofed down" — distillers add water to bring the alcohol to a target bottling proof, often somewhere around 80 to 100 proof. Barrel strength skips that step. The whiskey goes into the bottle at the proof it came out of the barrel, undiluted. That's why it's more potent and more intensely flavored — nothing has been watered down.
Barrel strength, barrel proof, cask strength — what's the difference?
In practice, these terms all point to the same idea: bourbon bottled without cutting it down with water. You'll see "cask strength" used widely, while "barrel proof" is the more regulated U.S. term for whiskey bottled at (or very near) the strength it left the barrel. For a drinker, the takeaway is the same — you're getting it the way it came out of the cask.
What proof is it, and how do you drink it?
Because it isn't diluted, barrel strength bourbon often lands anywhere from about 110 to 130+ proof, and it varies barrel to barrel. Many people enjoy it neat to taste its full intensity, then add a few drops of water or a single ice cube to "open it up" and soften the heat — the choice is yours, which is part of the appeal.
Taste it straight from the barrel in Louisville
Our Premium Tasting pours whiskey straight from the barrel — uncut and unfiltered. That's barrel strength by definition: you're tasting it exactly as it comes out of the cask, side by side across multiple distilleries. See all our tasting experiences.