Lost Lantern 2023 Single Cask #6: Boulder Spirits


Classification: Straight Bourbon

Company: Lost Lantern

Distillery: Vapor Distillery

Release Date: July 26th, 2023

Proof: 142.6

Age: 6 Years

Mashbill: 51% Corn, 44% Malted Barley, 5% Rye

Color: Amber

MSRP: $120 (2023)

Official Website


Orange rind | Milk chocolate | Golden raisin | Mango | Papaya


Prune | Heavy barrel char | Vanilla extract | Dried fruit


Cola | Molasses | Dark chocolate | Barrel char | Black pepper


A pump in age and proof makes this a whopper of a sip for both good and bad reasons.

Lost Lantern’s latest batch of releases dubbed, “Summer of Bourbon” includes eight whiskeys in total ranging from the Blend Series (blends of whiskeys from multiple distilleries), the Single Distillery Series (blends of multiple casks from a single distillery), and the Single Cask Series (whiskeys from a single barrel from a single distillery). To learn more about these releases, check out the company’s press release for more information.

Distilled in a custom Scottish copper pot still, Boulder Spirits Straight Bourbon utilizes a non-traditional high malted barley mashbill. Reaching 6 years old marks some of the oldest bourbon from Boulder Spirits they’ve released outside of their home state of Colorado. Adding two additional years beyond when we first reviewed their Bottled in Bond Bourbon, a much more pronounced oak note is found throughout along with a heavy dose of cola and molasses which are now present. Coming in at a whopping 142.6 proof will turn a lot of eyes in its direction based on its proof alone, but it comes with a caveat. This is a case where the proof gets in the way of the whiskey’s unique characteristics - mainly, it drowns out its high malted barley note.

Thankfully, if you’re not offended by adding in a few drops of water and potentially stripping the bourbon of its HAZMAT status, you’re rewarded with a much more palatable and rich tasting bourbon. Though it may sound strange to get a richer tasting bourbon by diluting it, adding water helps this bourbon’s flavors open up as its proof is being tamed. I still feel the whiskey’s 44% malted barley isn’t being showcased as well as it deserves, but that will likely change as more 6+ year old whiskey is released by Boulder Spirits and potentially selected for future Lost Lantern releases.  

The barrel chosen for this release produced a total of 151 bottles.

The sample used for this review was provided to us at no cost courtesy its respective company. We thank them for allowing us to review it with no strings attached.
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Written By: Eric Hasman

July 20, 2023
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