Lost Lantern Whiskey

Boulder Spirits Colorado Straight Bourbon

Bourbon At Its Peak, From The Peaks

Boulder Spirits was founded by Scotsman Alastair Brogan, who has brought Scottish whiskymaking traditions to the Colorado Rockies. This dry, high-elevation environment makes for bold and unique spirits.

We are proud to have this unique straight bourbon whiskey as our first selection from the state of Colorado, one of the hotbeds of the whiskey renaissance taking shape all over the country. And this whiskey captures just why we’re so excited about Boulder Spirits, and about Colorado whiskey in general: it does something new.

Befitting Alastair’s roots in Scotland, Boulder uses a traditional Forsyths Scottish still and much of its output is Colorado single malt. So it’s only fitting that this straight bourbon whiskey, which was aged for 5 years in a 53-gallon new American oak cask, has a very unusual high-malt mashbill: 51% corn, 44% malted barley, and 5% rye. That’s the highest proportion of malt we’ve ever seen in a bourbon, and it works spectacularly well.

The result, after 5 years of aging at over a mile in elevation, is a very big, rich, juicy straight bourbon whiskey. Hearty oak surrounds chocolate mousse, maple syrup-drenched waffles, fudge, and toffee.

With a natural cask strength of 69.3%, this is a bourbon for people who love big bourbon, with a flavor profile that could only come from the mountains.

2021 Single Cask #3: Boulder Spirits Colorado Straight Bourbon Whiskey

Proof: 138.5
Age: 5 years
Quantity produced: 181 bottles
Format: 750mL
Details: Cask strength; Non-chill filtered; no color added

Cask Details

  • Mashbill — 51% corn, 44% Scottish malted barley, 5% rye
  • Maturation Barrel Info — New American Oak, Kelvin Cooperage
  • Barrel Entry Proof: 124.9
  • Barrel Size — 53 gallons
  • Finishing Barrel Info — N/A
  • Length of Secondary Maturation/Finishing — N/A
  • Age of Spirit — 5 years


  • Type: Single Cask
  • Pour: Neat or with a splash of water
  • Glass: glencairn or rocks glass
Whiskey Case Pack
Whiskey Drink

About Boulder Spirits / Vapor Distillery

Boulder Spirits (also known as Vapor Distillery) was founded by Scotsman Alastair Brogan, who has brought Scottish whiskymaking traditions to the Colorado Rockies. Using an authentic Scottish Forsyths copper pot still, Boulder makes American single malt (peated and unpeated) as well as bourbon in this dry, high-elevation environment. The rapid evaporation in the high mountain climate makes for bold and powerful spirits. Colorado is one of the hotbeds of the American whiskey renaissance, and Boulder truly stands out for intermingling the region’s unique climate and pioneer culture with Old World single malt traditions.

Learn more about Boulder Spirits

Want more barrel details? Interested in partnering with us? Get in touch.

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Lost Lantern Whiskey October 7, 2021


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