Overview: Michter’s US*1 Original Sour Mash sits in an interesting spot — it’s technically classified as a “whiskey” rather than a bourbon or rye, which gives Michter’s freedom to do what they want with the mashbill and process. (If you’re not sure what sour mash actually means, the short answer is: almost every bourbon uses it — Michter’s just puts it on the label.) At 86 proof it’s not going to light anyone’s hair on fire, but there’s a hook here: this bottle has a reputation for starting like a bourbon and finishing like a rye, and I wanted to see if that actually holds up. For the record, Michter’s also claims it was the first American whiskey to win Whisky of the Year from The Whisky Exchange, so expectations are set accordingly.

The “whiskey” classification is the key to understanding this bottle. To be labeled bourbon, the mashbill has to be at least 51% corn; to be rye, at least 51% rye. By calling this a sour mash whiskey, Michter’s sidesteps both requirements and can build a grain bill that doesn’t commit to either camp. That’s almost certainly deliberate — it’s the legal mechanism behind the “starts like a bourbon, finishes like a rye” personality. The undisclosed mashbill is likely sitting somewhere in the middle, with enough corn for the sweet front end and enough rye to drive the spicier finish. It’s a category most drinkers skip right past on the shelf, which is a shame, because the freedom it gives the distiller is the whole point.

How I Found It: This is a regular retail bottle — Michter’s has solid distribution and the US1 line shows up just about everywhere whiskey is sold. No allocation, no hunting. I received and tasted this in late 2023, picked up out of curiosity about the sour mash label more than anything. At around $45 it’s priced in line with the rest of the US1 lineup, which makes it an easy, low-stakes bottle to try something a little different.

Age: NAS

Proof: 86 (43% ABV)

Mashbill: Undisclosed

Nose: Inviting right out of the glass — this might be the most approachable nose in the Michter’s lineup. Rich caramel apple and vanilla bean lead the way, with a syrupy marshmallow quality underneath. There’s a bright hit of orange zest that keeps it from feeling heavy. If you sit with it long enough, you’ll catch a faint sourdough-starter yeastiness — a savory undercurrent that plays well against all that sweetness and hints at what’s coming on the palate.

Palate: Silky and easy at 86 proof, but not thin. Butterscotch, honey, and toffee hit first — classic bourbon sweetness. Then about halfway through, the floor shifts. Baked apricot and nutmeg show up, followed by a pop of rye spice and cinnamon that you don’t see coming at this proof. The mouthfeel is buttery and slightly more substantial than you’d expect from something in this range. The transitions are clean. It doesn’t feel like two whiskeys fighting for space — it feels deliberate.

Finish: Medium length, and this is where the “starts like a bourbon, finishes like a rye” thing actually lands. The sweetness drops off and you’re left with dry oak, leather, and a peppery rye kick that lingers longer than the proof would suggest. There’s a faint touch of dark cherry at the tail end. Clean exit. Palate is ready for another pour before the finish fully fades.

Why “Sour Mash” Is on the Label

It’s worth understanding why this bottle makes a point of advertising “sour mash” when virtually every bourbon and Tennessee whiskey on the shelf uses the exact same process. Sour mash just means a portion of spent mash from a previous distillation gets added to a new batch to regulate pH and keep the fermentation consistent — the bourbon equivalent of a sourdough starter, which is probably why that yeasty note on the nose feels so fitting here. Jim Beam, Jack Daniel’s, Buffalo Trace, all of them are sour mash whiskeys; they just don’t print it on the front label. Michter’s leans into it as branding, a nod to their heritage as one of the oldest American whiskey names. The full story of sour mash is worth a read if you want to understand why the marketing here is technically true but a little cheeky. The genuinely sweet-mash alternative — whiskey made without that backset — is rare enough that when a distillery does it, like Peerless, it becomes the whole identity of the brand.

Final Thoughts: I came into this mildly skeptical — 86 proof whiskey from a brand with a marketing department this active is easy to dismiss. But the bourbon-to-rye transition on the palate is real, and the sourdough note on the nose is the kind of thing you remember. It doesn’t belong in a Manhattan — too gentle for cocktails — but as a gateway bottle for someone who can’t decide between bourbon and rye, it’s legitimately the right answer. At around $45, it earns its price without needing the story behind it.

If You Liked This, Try…

• Michter’s US*1 Single Barrel Rye — The straight rye from the same US*1 lineup. A similar low-proof, clean, approachable house style, but committed fully to the rye side of the spectrum. Good for tasting where the Sour Mash’s spicier finish is coming from.
• Peerless Single Barrel Bourbon — The sweet-mash counterpoint. Where Michter’s advertises its sour mash, Peerless built a brand around being one of the only sweet-mash distilleries in the country. Tasting the two against each other is the clearest way to understand what the mashing process actually contributes.

Rating: Middle Shelf — Rating system explained