Mash Bills Explained: How Grain Recipes Shape American Whiskey
A "mash bill" is the proportional grain recipe used in distillation, expressed as percentages — for example, a typical bourbon mash bill might be 75% corn, 13% rye, 12% malted barley. The mash bill is one of the defining variables for American whiskey and is the principal way Kentucky bourbon brands differentiate their product. Each grain contributes distinct character.
Corn
Corn (maize) is the dominant grain in American whiskey and the legal majority (51% minimum) in bourbon. Corn produces sweet, full-bodied, creamy character — vanilla, caramel, butter, soft sweetness. The higher the corn percentage, the rounder and sweeter the whiskey: Heaven Hill's old Bottled-in-Bond Mellow Corn is essentially all corn; most bourbons are 70-78% corn.
Rye
Rye is the spicy grain. Rye in a bourbon mash bill (the "high-rye" style) produces black pepper, clove, baking spice, and a drier finish — think Wild Turkey, Bulleit, Four Roses high-rye recipes. Pure rye whiskey (51%+ rye) is dramatically more spicy and dry: Sazerac Rye, Pikesville, Rittenhouse.
Wheat (in wheated bourbon)
Wheat as the secondary grain (in place of rye) produces "wheated bourbon" — softer, sweeter, breadier, with less spice. Maker's Mark is the most famous wheated bourbon. The Pappy Van Winkle and W. L. Weller lines (both Buffalo Trace wheated mash bills) are the prestige wheated category.
Malted barley
A small percentage of malted barley (typically 5-15%) is included in most American mash bills, primarily for its enzymes — malted barley provides the diastatic enzymes that convert grain starches to fermentable sugars. Malted barley itself contributes a bready, slightly nutty character but in such small proportions its flavour impact is modest.
Unusual mash bills
Some craft distillers and a few major producers experiment with unusual grains: Balcones uses Texas blue corn; FEW has used Cold Cut Bourbon proofed with coffee; some American single malts use only barley (no corn at all); millet, sorghum, spelt, and oat-based whiskeys exist at the craft margins.
Typical bourbon mash bill examples
- Buffalo Trace Mashbill #1: 76% corn, 10% rye, 14% malted barley (used for Buffalo Trace, Eagle Rare, George T. Stagg)
- Buffalo Trace Mashbill #2: 76% corn, 12-14% rye, 10-12% malted barley (higher rye for Blanton's, Elmer T. Lee, Hancock's Reserve)
- Wheated Mashbill (W.L. Weller, Pappy Van Winkle): 70% corn, 16% wheat, 14% malted barley
- Sazerac Rye: 51% rye, 39% corn, 10% malted barley (the legal minimum for rye)
- Wild Turkey: 75% corn, 13% rye, 12% malted barley (with much-discussed proprietary yeasts)
Plan your next trip
American distilleries cluster overwhelmingly in Kentucky for bourbon, with craft producers spread nationally for innovative mash bills. The interactive map shows the geography. Visitor tours at Kentucky distilleries almost always explain the local mash bill in detail.