Cheddaring is a specific step in cheesemaking where drained curds are cut into thick slabs, stacked on top of each other, and repeatedly flipped. The weight of the stacking squeezes out whey, lowers moisture, and creates the dense, smooth texture that defines cheddar cheese. It’s the single step that separates cheddar from most other cheese varieties, and it relies on a precise combination of pressure, acidity, and time.
How the Process Works
After milk is coagulated and the resulting gel is cut into small cubes (typically 6 to 10 millimeters), the curds are stirred and heated to expel whey. Once enough whey has drained off, the curds mat together into a solid mass at the bottom of the vat. This is where cheddaring begins.
The cheesemaker cuts that matted curd into rectangular slabs, usually a few inches thick, and stacks them two or three high. The weight of the upper slabs presses down on the lower ones, forcing out more whey. Every 10 to 15 minutes, the slabs are flipped and restacked so the pressure is applied evenly. This cycle of cutting, stacking, and flipping continues for roughly one to two hours, during which the slabs visibly flatten and become smoother, denser, and more pliable.
Throughout this process, bacteria in the curd are steadily producing lactic acid, which drops the pH. The cheesemaker monitors acidity closely, because cheddaring needs to end at the right moment. Once the curd reaches the target acidity, the slabs are milled (torn or cut into small finger-sized pieces), salted, and then pressed into molds for aging.
Why Stacking Changes the Texture
Cheddaring isn’t just about squeezing out moisture. The combination of pressure and the curd’s own weight physically rearranges the protein structure inside the cheese. As the slabs are stacked and turned, the casein proteins (the main structural proteins in cheese) get stretched, knitted together, and aligned into parallel fibers. This is what gives well-cheddared curd its characteristic “chicken breast” texture: you can tear a slab along those fibers the way you’d pull apart cooked meat.
This fibrous alignment only happens under specific conditions. Research dating back to the late 1950s showed that the curd must reach a pH of about 5.8 or lower before mechanical forces can create this structure. At higher pH levels, pressing and flipping won’t produce the same effect. What’s happening is that rising acidity partially loosens the protein network, and then the physical forces of stacking and gravity stretch and orient those loosened fibers into an organized arrangement. Pressure and flow don’t create the fibers from scratch. They organize fibers that acidity has already started to form.
Moisture Control During Cheddaring
Removing whey is a running theme throughout the entire cheesemaking process, but cheddaring is one of the final opportunities to dial in the moisture content before the cheese goes into molds. During the earlier stages of cutting and cooking curds, roughly 18 to 25% of the moisture present in the curd at cutting is expelled, depending on how much bacterial culture was used. More acid production means more moisture loss.
By the time cheddar is pressed and ready for aging, its moisture content typically sits around 35 to 38%. The height of the stacking, the size of the slab blocks, and how often they’re turned all give the cheesemaker fine control over how much additional whey drains out. A longer cheddaring time or taller stacks push more moisture out, resulting in a drier, firmer cheese. Shorter cheddaring keeps more moisture in, producing a softer result. This is one reason cheddar can range from creamy and mild to hard and crumbly: the cheddaring step is tuned differently.
Milling and Salting
Once the slabs reach the target acidity, the cheesemaker tears or cuts them into small irregular pieces, a step called milling. This dramatically increases the surface area of the curd, which serves two purposes. First, it allows salt to be distributed evenly when it’s mixed in by hand or machine. Second, the salt slows down the bacteria that have been driving acid production, essentially locking in the flavor and texture profile the cheesemaker wants. Without milling, salt would only reach the outside of the slabs, leaving the interior under-salted and still acidifying.
After salting, the milled curds are packed tightly into molds and pressed under heavy weight for hours. This final pressing fuses the small pieces back into a solid block, which then ages for anywhere from a few months to several years.
Traditional Hand-Cheddaring vs. Modern Methods
In a traditional creamery, cheddaring is done entirely by hand. A cheesemaker physically lifts and flips slabs that can weigh several pounds each, repeating the process dozens of times per batch. It’s labor-intensive work, and estimates from the 1960s highlighted just how much manual effort traditional cheddar production required compared to other cheese styles.
Most large-scale cheddar today is made using mechanized systems. Tower-style machines and conveyor setups automate the stacking and turning, processing curd continuously rather than in individual batches. The curd travels through a series of stages that replicate the pressure and timing of hand-cheddaring but at much higher volumes. While these systems produce consistent results, some artisan cheesemakers argue that hand-cheddaring allows for more precise adjustments based on how the curd looks and feels on a given day, since factors like milk composition and humidity can shift the ideal timing.
A number of cheeses beyond cheddar also use a cheddaring step, or a variation of it, to achieve a similar dense, smooth texture. Colby, Monterey Jack, and some territorial English cheeses involve modified versions of the process, though the stacking duration and target acidity differ. The technique is defined by the action, not the cheese it ends up in.