Finishing Casks
Finishing Casks
Whisky education from Whisk(e)y Advent 2025 (2025-12-03). Summary below; full write-up with sources and images: calendar/2025-12-03.qmd.
Secondary-cask finishing began historically as cost-saving (reusing wine/port/sherry/rum casks) and now shapes flavor. For bourbon it raises a definitional debate, since bourbon must use new charred oak with no additives; finished bourbons must carry a statement of composition.
Verbatim source text
Reproduced from calendar/2025-12-03.qmd (Whisk(e)y Advent 2025).
Scotch and bourbon are required to be matured in oak barrels, but often additional barrels are also used to impart different flavors to the spirit. It is written that cask finishing began historically as a cost-saving measure; merchants carrying both wine and whisky would refill casks with whisky instead of buying new casks. These days, it is common to see old wine, port, sherry, or rum casks get reused for aging spirits.
While finishing in secondary casks is well-known in the history of scotch and Irish whisk(e)y, in the case of bourbon, there’s been a little more discussion over the past few years around how secondary casking changes the spirit. Remember, a bourbon is defined as
- aged in new, charred oak containers,
- containing no other additives,
Does aging in a different cask with traces of rum, wine, etc. count as an additive? It’s certainly not a new oak container. As recent as 2018, new legislation has been suggested to clarify the issue:
If spirits are aged in more than one oak barrel (for example, if a whisky is aged 2 years in a new charred oak barrel and then placed into a second new charred oak barrel for an additional 6 months,) only the time spent in the first barrel is counted towards the ‘‘age.’’
or
When a producer stores the whisky in oak containers and then stores it in a different type of container, such as a maple barrel, the spirit becomes a distilled spirits specialty product and must be labeled with a statement of composition, such as ‘‘Bourbon Whisky finished in maple barrels.’’
Regardless, barrel-finished bourbons have become as common as they are delicious. We’ll sample a few more before Christmas gets here. In the case of The Burning Chair, the fruit notes are likely thanks to the grenache 1 barrels that the bourbon is finished in.