Tennessee Whiskey · Mash Bill
Why is Tennessee whiskey not bourbon?
Almost every bottle of Tennessee whiskey on a U.S. shelf is bourbon by every federal definition that matters; the distillers just file it under a different label. Tennessee whiskey meets the federal Standard of Identity for bourbon in full, and a 2013 state law lets producers brand their product as a separate Tennessee whiskey category instead. The line everyone repeats, that charcoal filtration is what makes it "not bourbon," gets the rule backwards, and one Tennessee distillery quietly proves it.
Does Tennessee whiskey meet the federal bourbon definition?
Yes, in every respect. The federal Standard of Identity for bourbon is set by the Code of Federal Regulations (27 CFR 5.143), and it consists of a short list of rules:
- The mash bill must be at least 51% corn.
- It must be distilled to no more than 160 proof (80% ABV).
- It must enter the barrel at no more than 125 proof (62.5% ABV).
- It must be aged in new, charred oak containers.
- It must be made in the United States.
- Nothing can be added except water to reduce proof.
Tennessee whiskey hits every one. The major Tennessee producers use corn-heavy mash bills (Jack Daniel's is roughly 80% corn, 12% malted barley, 8% rye), distill below 160 proof, barrel below 125 proof, fill new charred oak barrels, are made in the U.S., and add nothing. There is no requirement that bourbon be made in any specific state. Kentucky has the brand association, but the federal definition has no geographic restriction inside the country.
So by the only law that matters at the federal level, Tennessee whiskey is a type of bourbon.
| Requirement | Bourbon | Tennessee whiskey |
|---|---|---|
| Mash bill | At least 51% corn | At least 51% corn |
| Distillation proof | 160 max | 160 max |
| Barrel entry proof | 125 max | 125 max |
| Barrel | New, charred oak | New, charred oak |
| Place of production | United States | Tennessee |
| Additives | None except water | None except water |
| Charcoal filtration before barrel | Not required | Required (Lincoln County Process) |
Read that table the right way around: Tennessee whiskey is bourbon plus two extra requirements (Tennessee origin, charcoal filtration). The extras add to the bourbon rules. They do not replace them.
What is the Lincoln County Process, and why is it the line distillers draw?
Before the spirit goes into the barrel, Tennessee distillers run it slowly through a thick column of sugar-maple charcoal. The column can be ten feet deep. The new-make whiskey drips through the charcoal for several days before it ever sees a cask. This step is called the Lincoln County Process, named after the Tennessee county where the practice originated in the 19th century.
The charcoal pulls some of the harsher congeners out of the spirit before maturation. Congeners are the flavor and aroma compounds produced during fermentation and distillation, the things that make a new-make whiskey taste raw. The filtration mellows the spirit's edges before the barrel gets to do its slower work.
Jack Daniel's built its identity around this step. Generations of marketing taught American drinkers that the charcoal mellowing was the thing that made the spirit its own category. When Tennessee codified that identity in 2013, House Bill 1084 (now TN Code § 57-2-106) wrote the Lincoln County Process into state law as a requirement for anything sold as Tennessee whiskey.
Here is the part that gets stated backwards: the Lincoln County Process is an additional step on top of the bourbon rules. It is not a substitute for them, and it does not push the spirit out of the bourbon category. The federal definition of bourbon does not forbid charcoal filtration before barreling. Filtration is silent in the rule. So a spirit that has been through charcoal mellowing and meets the other six bourbon rules still is bourbon, federally. The Lincoln County Process makes a Tennessee whiskey a Tennessee whiskey. It does not unmake the bourbon underneath.
Is Jack Daniel's a bourbon, then?
Federally, yes. Jack Daniel's Old No. 7 meets the bourbon Standard of Identity in full: a corn-heavy mash bill, new charred oak barrels, made in the U.S., compliant proofs at distillation and barrel entry, no additives. The only reason it is not sold as bourbon is that the company chooses to sell it as Tennessee whiskey instead, and Tennessee state law lets them define their product that way.
The brand benefits from that choice. "Tennessee whiskey" sets Jack Daniel's apart from the Kentucky shelf and ties it to a single state's tradition. It is a category of one place, marketed by the few producers in that place. Bourbon, by contrast, is national and crowded. So the label is a positioning decision more than a chemical or legal one. The question of whether Tennessee whiskey can also be called bourbon is a labeling question, not a recipe question.
Is there a Tennessee whiskey that isn't bourbon?
There is one, and it is the case that pins the whole answer down. Prichard's Distillery, in Kelso, Tennessee, makes a Tennessee whiskey that does not go through the Lincoln County Process. When Tennessee passed the 2013 law, Prichard's secured an exemption written directly into the statute, on the grounds that the distillery predated the law and never used charcoal mellowing in the first place.
Prichard's still sells its product as Tennessee whiskey. Federally, that product also meets the bourbon Standard of Identity, because bourbon never required charcoal filtration. So Prichard's is, simultaneously, a Tennessee whiskey by state law and a bourbon by federal law, without the step everyone else points to as the dividing line.
That is what makes the charcoal-filtration answer collapse. If the Lincoln County Process were really what separated Tennessee whiskey from bourbon, Prichard's could not exist as Tennessee whiskey. It does. The category boundary turns out to be a label set by one state, not a technical distinction that holds up under examination. The real difference between Tennessee whiskey and bourbon is the writing on the bottle and the law of one state. The spirit itself is bourbon either way.