Step-by-Step Process of Making Cheddar Cheese

Cheddar cheese is one of the most widely consumed cheeses in the world, and its production follows a precise sequence of steps – each one building on the last. From selecting the right milk to pressing the final block, cheddar making is a controlled process of moisture removal, acid development, and curd transformation. Let’s walk through each stage of how cheddar cheese is actually made.

Milk selection and standardization 🔗

Every batch of cheddar begins with high-quality milk. The milk – almost always cow’s milk – is first tested for acidity, bacterial count, and the presence of antibiotics or inhibitors that could interfere with starter cultures later in the process. Milk that fails any of these tests is rejected outright.

Once approved, the milk goes through standardization, which means adjusting its fat and protein content to specific levels. For cheddar, the target is typically around 3.2-3.5% fat and a similar protein percentage. This is done by either adding cream (to increase fat) or skim milk (to reduce it). Standardization is essential because the protein-to-fat ratio directly affects yield and texture of the final cheese. Without consistent ratios, the same recipe would produce different results from batch to batch.

Modern cheese plants also check for somatic cell count, which can indicate mastitis in cows and lead to poor coagulation. In short, the quality of cheddar starts well before anything happens in the vat.

Pasteurization 🔗

After standardization, the milk is pasteurized to eliminate harmful pathogens such as Salmonella, E. coli, and Listeria. The most common method used in cheddar production is High Temperature Short Time (HTST) pasteurization, where the milk is heated to approximately 72°C (161°F) for 15 seconds and then rapidly cooled.

This step is non-negotiable in commercial production. While some artisanal producers use raw milk (which must then be aged for at least 60 days under food safety regulations), pasteurization provides a reliable safety baseline. It does slightly affect the protein structure and can subtly alter final texture, but the safety benefits in large-scale production far outweigh those minor differences.

After pasteurization, the milk is cooled to around 30-32°C (86-90°F) – the ideal temperature for the next step.

Addition of starter cultures 🔗

At this stage, starter cultures – carefully selected strains of lactic acid bacteria – are introduced into the milk. The primary species used in cheddar making are Lactococcus lactis subspecies (lactis and cremoris), often combined with Streptococcus thermophilus.

These bacteria do one crucial job: they convert lactose (milk sugar) into lactic acid. This acidification lowers the pH of the milk and sets the stage for proper coagulation, flavor development, and preservation. The cultures are typically added at about 1-2% of the milk volume and allowed to ripen for 30-45 minutes. During this period, the pH drops from around 6.6 to approximately 6.4.

Some producers also add adjunct cultures – such as Lactobacillus casei or Lactobacillus plantarum – to enhance flavor complexity during aging. Colour additives like annatto may also be added at this stage to give certain cheddars their characteristic orange hue.

Coagulation with rennet 🔗

Rennet is the enzyme responsible for transforming liquid milk into a semi-solid gel. Traditionally derived from the stomach lining of milk-fed calves, rennet contains chymosin, which acts on casein proteins and causes them to aggregate into a network that traps fat and moisture.

Today, most commercial cheddar production uses microbial or recombinant (GMO) rennet, which was first approved by the U.S. FDA in 1990. The rennet is diluted in clean, chlorine-free water and gently stirred into the cultured milk for even distribution. The vat is then left undisturbed for about 30-40 minutes.

The result is a firm, gel-like coagulum. The classic way to check readiness is the “clean break” test – a flat blade is inserted at a 45-degree angle and lifted slowly. If the curd breaks cleanly with a glassy fracture, it’s ready to cut.

Cutting the curd 🔗

Once the coagulum is set, it’s cut into small, uniform cubes using stainless steel wire knives or curd harps. For cheddar, the cubes are typically cut to about 6-16 mm in size.

Curd size directly affects moisture content in the finished cheese. Smaller cubes release more whey, producing a drier cheese, while larger cubes retain more moisture. The goal for cheddar is a relatively low-moisture product, so cubes are usually on the smaller side.

Cutting must be done gently and efficiently. Rough handling at this stage causes fat and protein to leak into the whey, reducing yield. According to standard practice, whey fat content should stay at or below 0.3% – a key indicator of how clean the cut was. After cutting, the curds are left to settle briefly for 10-15 minutes before the next step.

Heating (scalding) and stirring 🔗

The cut curds and whey are now gradually heated – a process called scalding or cooking. For cheddar, the temperature is slowly raised from the cutting temperature (around 30°C) to approximately 38-39°C (100-102°F) over 20-60 minutes.

This gradual heating serves two purposes. First, it causes the curd particles to shrink and expel more whey, making them firmer. Second, it helps develop the right texture by causing protein strands to fuse together. Throughout this step, the curds are stirred continuously to prevent clumping, ensure even heat distribution, and avoid overcooking.

The endpoint of scalding is typically judged by feel – the curds should be firm and springy when squeezed, breaking cleanly between the fingers. By the end of cooking, the whey pH reaches approximately 6.1 to 6.4.

Draining the whey 🔗

Once the curds are sufficiently firm, the whey is drained off. In most cheese vats, this is done by opening a gate or valve at the bottom of the vat while keeping curds in place with a screen or gate. The curds are raked to the sides of the vat, creating a channel in the middle for whey to flow out.

At this point, the curds begin to mat together – forming a solid, slab-like mass at the bottom of the vat. This matting is the natural transition into the next and most defining step of cheddar production.

Cheddaring 🔗

This is the step that gives cheddar cheese its name and its identity. Cheddaring involves cutting the matted curd into blocks (loaves), then repeatedly stacking, turning, and re-stacking those blocks over a period of about 1.5-2 hours.

The weight of the stacked blocks squeezes out additional whey, while the warmth of the curd (maintained at around 35-38°C) allows the starter cultures to continue producing acid. As the pH drops – typically reaching 5.1-5.3 by the end – the curd undergoes significant physical changes. Calcium phosphate is gradually lost from the protein matrix, causing the texture to shift from crumbly and granular to smooth, pliable, and fibrous.

This fibrous texture is the hallmark of properly cheddared curd. You can test it by tearing the curd – well-cheddared curd pulls apart in long, chicken breast-like strands rather than breaking into chunks. The process also contributes significantly to the final flavor and body of the cheese.

Milling 🔗

After cheddaring is complete, the large curd slabs are fed through a curd mill, which cuts them into small, uniform pieces – roughly 1-2 cm in size. These milled pieces have a shape sometimes compared to thick chips or small fingers.

Milling serves a practical purpose: it increases the surface area of the curd, which allows for more even salt distribution in the next step. The milled curds are stirred continuously after milling to prevent them from re-matting into a solid mass again.

Salting 🔗

Salt is added directly to the milled curds – a process known as dry salting. The amount typically ranges from 1-3% by weight of the curd, and the salt is mixed thoroughly to ensure even distribution.

Salting plays several roles in cheddar production. It enhances flavor, drawing out more whey and further reducing moisture content. It acts as a preservative by inhibiting the growth of unwanted bacteria. And critically, it halts starter culture activity, stopping acid production at the desired level. Without this check, the cheese would become excessively sour and develop a chalky, crumbly texture.

Some of the salt – roughly 0.5% – washes away with the whey that continues to drain after salting, leaving around 1.5-1.8% salt in the finished cheese.

Hooping and pressing 🔗

The salted, milled curds are now packed into cheese hoops (molds), which are typically lined with cheesecloth to aid drainage and create a smooth surface. The hoops give the cheese its final shape – whether a traditional wheel or a rectangular block.

Pressing happens in stages. Initial light pressure (around 10-20 psi) allows gentle whey removal, followed by progressively higher pressure (up to 40-50 psi) for final consolidation. The cheese is turned and re-wrapped several times during pressing, which usually lasts 12-24 hours.

The goal of pressing is to fuse the individual curd pieces into a solid, homogeneous block and to eliminate any trapped air pockets. Air pockets are a concern because they can harbor bacteria during the long aging period. After pressing, the cheese has a firm, smooth exterior and is ready for the final stage.

Aging (ripening) 🔗

The freshly pressed cheddar is moved to a temperature-controlled aging room, typically maintained at 6-8°C. Here, complex biochemical changes – including proteolysis (protein breakdown) and lipolysis (fat breakdown) – gradually develop the characteristic flavor, aroma, and texture of the cheese.

Aging duration depends on the desired product. Mild cheddar is aged for about 2-3 months. Medium or sharp cheddar typically ages for 6-12 months. Extra mature or vintage cheddar may be aged for 18 months to several years – with some specialty cheddars aged up to a decade.

During aging, the cheese may be waxed, vacuum-sealed in plastic, or wrapped in traditional cheesecloth (muslin). Cloth-bound cheddar allows more moisture and gas exchange, often resulting in more complex flavors. Waxing, on the other hand, is easier to manage and retains more moisture.

Quality control throughout the process 🔗

At every stage – from milk reception to final aging – quality parameters are monitored closely. The key measurements include pH, temperature, moisture content, fat content, and microbial safety. Finished cheddar should typically have a moisture content of 36-39%, appropriate fat levels for its grade, and a pH that reflects proper acid development.

Modern cheese plants use computerized monitoring systems to track these variables in real time. However, the experienced cheesemaker’s ability to assess curd firmness by touch, whey clarity by sight, and acid development by taste remains irreplaceable. The entire active manufacturing process – from milk to pressed cheese – typically takes 8-12 hours.

Summary of manufacturing steps 🔗

Here’s a quick overview of the complete cheddar cheese manufacturing sequence:

Milk selection and standardization → Pasteurization → Addition of starter cultures → Coagulation with rennet → Cutting the curd → Scalding and stirring → Draining whey → Cheddaring → Milling → Salting → Hooping and pressing → Aging

Each step is carefully designed to control moisture, develop acidity, build structure, and prepare the cheese for ripening. Even small variations in timing, temperature, or pH at any stage can significantly impact the final product’s quality, flavor, and texture.

What do you think? Given how precise and interconnected each step of cheddar making is, which stage do you think has the greatest influence on the final flavor? And with modern automation increasingly entering cheese production, can technology truly replicate the instinct and judgment of a skilled cheesemaker?

References

1. https://www.milkfacts.info/Milk%20Processing/Cheese%20Production.htm
2. https://dairyprocessinghandbook.tetrapak.com/chapter/cheese
3. https://www.usdairy.com/news-articles/how-is-cheese-made
4. https://en.wikipedia.org/wiki/Manufacture_of_cheddar_cheese
5. https://www.sciencedirect.com/topics/food-science/cheddar-cheese
6. https://www.sciencedirect.com/topics/agricultural-and-biological-sciences/manufacture-of-cheddar-cheese
7. https://www.cheddargorgecheese.com/how-cheddar-cheese-is-made/