American single malt explained

A new category with old roots

The United States has long been a corn and rye country for whiskey. Bourbon and rye dominate the shelves. Over the last two decades, a growing number of craft distillers began making whiskey from 100% malted barley, often inspired by Scotch but with American ideas about casks and climate.

Those distillers pushed for a legal definition so customers could trust the term. The US Alcohol and Tobacco Tax and Trade Bureau (TTB), which writes the standards of identity for spirits, added American single malt whisky as a formal category in late 2024.

What the rules require

To be called American single malt whisky, the spirit must be:

• made from 100% malted barley
• distilled entirely at one distillery in the United States
• mashed, distilled and matured in the United States
• distilled to no more than 80% ABV
• matured in oak barrels of no more than 700 litres
• bottled at a minimum of 40% ABV

The rules do not require new charred oak, pot stills or a minimum age beyond what the general whisky rules set. That freedom is deliberate.

How it differs from bourbon

Bourbon is made from at least 51% corn and must be filled at no more than 62.5% ABV into new charred oak containers. That new wood gives bourbon its bold vanilla, caramel and toasted sugar. American single malt is all malted barley and can use any oak barrel: new or used, charred or not, ex-bourbon, ex-wine or ex-sherry.

So the two can taste very different. Bourbon is sweet and corn led. American single malt is malty, bready and fruity, with the cask adding whatever the distiller chose.

How it differs from Scotch

Single malt Scotch must be distilled in pot stills at one distillery in Scotland and aged at least three years in oak in Scotland. American single malt allows any type of still, so some producers use column stills or hybrid stills with columns attached. Many American producers also use new charred oak, which Scotch makers rarely do for malt.

Climate matters too. Much of the US has hot summers and cold winters, which speeds up how fast spirit and wood interact. A five year old American single malt from a hot warehouse can taste older and more oak heavy than a five year old Scotch. Our guide to Indian single malt covers similar effects in Indian heat.

What it tastes like

Because the rules allow so much, the flavours vary widely. Common threads include:

• a malty, biscuity or bready core from the barley
• bold vanilla and baking spice when new charred oak is used
• dried fruit or red berry notes from wine or sherry casks
• smoke, when the malt is peated or smoked with local woods

Some producers smoke their barley with wood rather than peat, giving notes quite unlike Islay whisky.

Why American distillers wanted the category

Before the definition, a bottle labelled American single malt could mean almost anything. Some producers used it for whiskey blended from several distilleries. Others used it for 100% malt from a single site. Customers had no way to tell from the label alone.

The craft producers behind the push wanted a clear promise: all malted barley, one distillery, made in the United States. That gives a bar or a shop a reason to put the category on its own shelf rather than lumping it in with bourbon or imported Scotch.

A defined category also changes how distilleries plan. They can commit to malt production knowing the term on the label will carry meaning. When you find one on an Indian shelf, the category name now tells you the grain, the country and that a single distillery made every drop.

How to taste it

Set up a small flight: one bourbon, one Scotch single malt and one American single malt. Pour 20 ml of each. Nose them in that order and notice where the American malt sits between them. Taste neat, then with a little water. Keep water nearby and the pours small. Never drive after tasting.

Your first step: look at the label of an American malt for the words American single malt. Then check the cask type on the back label. That one detail will tell you most of what to expect.

Common questions

What is American single malt whisky?

Whisky made from 100% malted barley at a single US distillery, distilled to no more than 80% ABV and matured in oak barrels of 700 litres or less.

Does American single malt need new charred oak?

No. Unlike bourbon, American single malt can use new or used oak barrels, charred or uncharred.

How is American single malt different from Scotch?

It can use any still type, including column stills. It is matured in the US, often in hotter climates that speed up cask influence.