After distillation, tequila may be bottled without oak aging or spend months or years in barrels. Oak can add vanilla, spice and other wood-derived aromas, while a barrel’s previous contents and treatment influence what it contributes. Labels such as reposado and añejo indicate minimum periods in oak.
Before bottling, a producer may also combine tequila from several barrels to keep a product’s flavor consistent. Blending can involve unaged batches too, so it also belongs in the production of some blancos.
Tequila's aging classes
Mexico's tequila standard sets minimum aging periods for reposado, añejo and extra añejo. Añejo and extra añejo must also mature in oak containers no larger than 600 liters. Blanco can be bottled unaged or spend less than two months in oak.
| Class under Mexico's tequila rules | Time in oak | Container condition |
|---|---|---|
| Blanco or plata | Unaged, or less than two months | Brief oak maturation is allowed |
| Reposado | At least two months | Oak container; no 600-liter limit in this definition |
| Añejo | At least one year | Oak container no larger than 600 liters |
| Extra añejo | At least three years | Oak container no larger than 600 liters |
Reposado has no one-year maximum in the standard. El Tequileño's Reposado Rare, for example, matures for six years in a large American-oak barrel, according to the producer. The producer does not specify the barrel's capacity in liters.
How oak changes tequila
Oak contributes aroma compounds associated with vanilla, woody or coconut notes and spice. Heat treatment changes the wood: toasting heats the inside of the barrel, while charring burns its inner surface. Some wood compounds contribute smoky or burnt notes.
Used wine and whiskey barrels add different flavors. Patrón described red-fruit and dried-fruit notes from its Bordeaux-wine casks, and lighter fruit, vanilla and oak notes from used American whiskey casks in 2021.
Tequila evaporates during barrel aging
A barrel of tequila gradually loses liquid through evaporation, known as the angel's share. Conditions in the barrel room affect how much is lost. Patrón put its average loss at about 1% per month in 2021, attributing the relatively high evaporation to barrel rooms without climate control.
For the differences between tequila and bourbon maturation, see Tequila Versus Bourbon — Aging.
Blending before bottling
Patrón blends barrels of aged tequila to keep the flavor consistent from batch to batch. In its 2021 account, the producer described changing the combination of barrels for successive blends. It also blends unaged tequila for Silver, combining separately distilled batches from its tahona (stone-wheel) and roller-mill extraction processes.
Mexico's rules specify the class of mixed tequilas. Reposado mixed with añejo or extra añejo is reposado; añejo mixed with extra añejo is añejo. Blanco mixed with aged tequila is joven or oro.
Joven or oro can also be blanco that has undergone abocamiento, a mellowing treatment using permitted ingredients such as caramel color or oak extract.
For agave preparation, fermentation and distillation, see How tequila is made.
Questions about aging and blending tequila
Does all tequila need barrel aging?
No. Blanco tequila can be bottled without oak aging. Mexico's standard also allows blanco to spend less than two months in oak.
Can reposado tequila be older than one year?
Yes. Mexico's definition of reposado tequila sets a minimum of two months, with no one-year maximum.
Is blended tequila always barrel-aged?
No. Unaged tequila batches can be combined before bottling. Patrón does this for Silver, blending batches made through its tahona (stone-wheel) and roller-mill extraction processes.
Does an older tequila always taste better?
No. More time in wood changes tequila, but age alone does not determine whether you'll enjoy it. Agave, earlier production, barrel choice and blending also affect the flavor.
Does tequila keep barrel-aging after it is bottled?
No. Once bottled, tequila has left the barrel. Years in the bottle do not add to its barrel-aging period.
Sources
- NOM-006-SCFI-2012, §§4.1, 4.24 and 4.36.1–4.36.5; official status record.
- Academia Patrón (2021), pp. 49–54.
- ISC: Toasting Barrels and Barrel Assembly.
- Patrón's process guide.
- El Tequileño: Reposado Rare.