Mezcal is made by roasting agave hearts in underground pits, crushing them to extract their juices, fermenting the mash with wild yeast, and distilling the liquid in clay pots or copper stills. The entire process, from pit to bottle, takes roughly two to three weeks per batch, though the agave plants themselves need years or even decades to mature before they’re ready. What sets mezcal apart from other spirits is how much of this process still happens by hand, using methods that haven’t fundamentally changed in centuries.
Choosing and Harvesting the Agave
Unlike tequila, which can only be made from Blue Weber agave, mezcal draws from around 20 different agave species. Each one produces a spirit with a distinct flavor profile, and the choice of agave is the single biggest factor in how the final mezcal tastes.
Espadín is by far the most common species in modern mezcal production. It matures in six to ten years, making it the most practical choice for producers. Cuishe, a taller and more slender variety, takes 12 to 15 years to reach maturity. Tepeztate, one of the most prized wild agaves, requires up to 25 years before it’s ready for harvest. That timeline is part of why bottles made from rarer species can cost several times more than an espadín mezcal.
When an agave plant is mature, a worker called a jimador uses a sharp, flat blade called a coa to hack away the thick, spiny leaves. What’s left is the dense core of the plant, called the piña because it resembles a large pineapple. Depending on the species, a single piña can weigh anywhere from 40 to over 200 pounds.
Roasting in an Earthen Pit
This is the step that gives mezcal its signature smoky character. The producer digs a large conical pit in the ground, typically six to eight feet across, and lines it with rocks. A fire is built at the bottom and allowed to burn until the rocks are extremely hot. The piñas are then stacked on top of the heated stones, covered with layers of agave fiber, woven mats, and earth, and left to slow-roast for three to five days.
The buried pit works like a massive underground oven. The hot stones break down the agave’s complex carbohydrates into fermentable sugars, while the smoldering wood and earth impart the smoky flavors that define mezcal. The type of wood, the local stone, even the soil composition all leave their mark on the final spirit. This is one reason mezcal from different regions can taste so different, even when made from the same agave species.
Crushing the Roasted Agave
Once the piñas come out of the pit, they’re soft, caramelized, and deeply aromatic. The next step is crushing them to release the sweet, smoky juice inside. The traditional tool for this is the tahona, a large stone wheel that rolls in a circular pit, grinding the cooked agave into a fibrous mash. The word “tahona” originally just meant “mill” in Spanish, but in Mexico it’s become synonymous with this specific stone wheel.
A donkey, horse, or ox typically pulls the tahona in slow circles. In more remote production sites, the tahona might even be carved from wood rather than stone. Some producers now use tractors to turn the wheel, and a growing number use mechanical shredders for efficiency. But many traditional mezcal makers stick with animal-powered tahonas, partly because the slower, less aggressive crushing extracts flavors differently than a machine. The tequila industry largely abandoned tahonas decades ago, with only a handful of producers still using them.
Fermentation With Wild Yeast
The crushed agave, juice and fiber together, goes into open fermentation vats. These are traditionally made from wood, though some producers use hollowed-out tree trunks, animal hides, or stone basins. Warm water is added to the mash to help kick-start the process.
Most traditional mezcal relies entirely on natural fermentation. No commercial yeast is added. Instead, wild yeast from the environment, the wooden vats, and the agave fibers themselves colonize the mash and begin converting sugars into alcohol. The dominant species is the same one responsible for beer and wine fermentation, but the wild strains found in mezcal distilleries have adapted to the specific conditions of the vats: high sugar concentrations, temperatures that can climb above 100°F, and the acidic, fibrous environment of cooked agave.
Fermentation runs for 8 to 16 days, significantly longer than most commercial spirit production. The open-air vats, wild yeast populations, and variable temperatures mean every batch ferments a little differently. This unpredictability is part of what gives artisanal mezcal its complexity, but it’s also why experienced mezcaleros monitor their vats closely, checking the bubbling, smell, and taste of the mash throughout the process.
Distillation in Clay or Copper
The fermented mash is distilled to concentrate the alcohol and separate out the flavors the producer wants to keep. Two types of stills dominate mezcal production, and the choice between them shapes the character of the spirit.
Clay pot stills, called ollas de barro, are the older method. These are handmade ceramic vessels stacked and sealed together. Clay stills tend to produce a more rustic, textured spirit because they offer less control over the distillation. Some flavor compounds that a more efficient still would strip away make it through, giving clay-distilled mezcal an earthier, more complex profile.
Copper pot stills, called alembiques, arrived in Mexico via European influence. Their sealed chamber and bell-shaped top circulate vapors more efficiently, causing liquid to evaporate and condense multiple times before it exits through a narrow pipe. This repeated condensation gives the distiller more precision in separating desirable flavors from harsh ones. Many producers in the Oaxacan town of Miahuatlán use a technique called the refrescador method, surrounding the top of the copper still with a bucket of cold water that gets refreshed throughout distillation. The cold water speeds up condensation and gives the distiller even finer control over which portion of the distillate to keep.
Most mezcal is distilled twice. The first pass produces a low-proof liquid. The second concentrates the alcohol and refines the flavor. During each distillation, the producer makes “cuts,” discarding the first liquid to come off the still (which contains harsh, volatile compounds) and the last (which is weak and watery), keeping only the heart of the run. This step takes one to two days.
Categories and Regional Protection
Not all mezcal is made the same way, and Mexican regulations recognize three production categories. “Ancestral” mezcal must use clay pot stills and traditional crushing methods. “Artisanal” mezcal allows copper stills and tahonas. “Mezcal” (without a qualifier) permits modern industrial equipment, including diffusers and column stills. The category appears on the label, so it’s a useful shorthand for understanding how hands-on the production was.
Mezcal also carries a Denomination of Origin, meaning it can only legally be called mezcal if it’s produced in designated zones across ten Mexican states. Oaxaca produces the vast majority, but certified mezcal also comes from Guerrero, Durango, Puebla, and others. Some states, like Michoacán and Jalisco, have municipalities that fall within overlapping denominations for different agave spirits.
Why the Process Takes So Long
Adding up the production steps, a single batch of mezcal takes roughly two to three weeks from roasting through distillation. But that timeline obscures the real bottleneck: the agave itself. Even the fastest-growing commercial species needs six years in the ground before harvest. A bottle made from tepeztate represents a quarter-century of plant growth, followed by weeks of labor-intensive processing that yields a relatively small amount of spirit. A single distillation run might produce only a few hundred liters.
This is why mezcal remains fundamentally a small-batch spirit. The earthen pits hold only so many piñas, the tahonas crush slowly, the wild fermentation can’t be rushed, and the clay or copper stills process modest volumes at a time. Every step constrains output in a way that industrial spirits production long ago engineered around. For mezcal, those constraints are the point.