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All About Blue Cheese

By Kate Shannon Published

From mild, buttery Cashel Blue to peppery, piquant Roquefort, blue cheeses vary widely in flavor, texture, and intensity. There’s one for everyone—even the skeptics.

In the roughly five years I worked as a cheesemonger, the shoppers I encountered never seemed nervous to pick out a wedge of Brie or a block of cheddar. But people were often a little apprehensive when they approached our blue cheeses. I was sympathetic. Blue cheese is a big, diverse category of cheese with a reputation for being strongly flavored and punchy. It can intimidate or perplex even adventurous eaters, as evidenced by the questions I heard: Is Gorgonzola the Italian word for blue cheese? How does the mold grow? Can you cook with fancy blue cheeses or should you save them for a cheese plate? And—perhaps the most common question—if you love other styles of cheese but have yet to find a blue that you enjoy, what should you buy?

I’m not at the cheese counter anymore, but I still wanted to help clear up the confusion. Rather than assembling a 21-person panel of tasters to sample a selection of blue cheeses in a blind tasting, I approached this topic differently. Because blue cheese is a big category with many different styles—all of which are worth learning about and trying—I decided to highlight a broad selection of styles, each good in its own way.

To put together this list of blue cheeses, I consulted with experts from The Guild of Fine Food, which organizes the World Cheese Awards, and the American Cheese Society to identify some of the world’s best and most important blue cheeses. I then narrowed them down to 14 that are readily available at American supermarkets, specialty shops, or online. I interviewed many of the manufacturers and ordered all the cheeses. Nine of the blue cheeses highlighted here are imports that have been produced for decades or even centuries. Five are produced domestically by cheesemakers that have helped define artisan cheese in America. These 14 blue cheeses are wildly different in flavor, texture, and intensity—and they are all excellent.

Blue Cheese Basics

Let’s get one of those questions out of the way. Gorgonzola is not just the Italian name for blue cheese. Like Parmigiano-Reggiano and Gruyère, it is a unique style of cheese manufactured according to specific regulations defined by European Union law. These regulations, which are divided into two tiers called Protected Designation of Origin (PDO) and Protected Geographical Indication (PGI), limit a given cheese’s production to a specific area and include standards for everything from ingredients to the size of the wheels to the number of days a cheese must be aged. Seven of the imported blue cheeses highlighted here have PDO or PGI status; the other two are trademarked and can each only be made by one specific company. The American cheeses are unique creations often inspired by blue cheeses made abroad but made here by specific cheesemakers in varying locations. American-made blue cheeses cannot be awarded PDO or PGI status.

How Blue Cheese Is Made

Although these 14 blue cheeses vary in size, shape, flavor, and intensity, there are many similarities in how they’re made. In a lot of ways, the process is similar to the processes used to make other cheeses. The milk is heated; cultures are added for flavor; and rennet or enzymes are added to make the milk coagulate into curds, which are drained from the liquid whey and formed into wheels. But for blue cheese, strains of mold are added, either as a liquid to the milk or as a powder sprinkled over the curds. Later, after the wheels are formed, large metal needles are inserted into the wheels, creating holes that allow oxygen to enter and activate the dormant mold spores.

The Science of Blue Mold

All blue cheeses are made with the same mold, Penicillium roqueforti. Cheesemakers select specific strains (or a combination of strains) to produce the colors, intensities, and flavors that they want in their cheeses. In order for the mold spores to grow properly, the cheese curds have to be the right size. Dean Sommer, cheese technologist at the University of Wisconsin–Madison’s Center for Dairy Research, explained that blue cheese curds are usually fairly big, about ½ inch in diameter, and form a wheel with an open structure. When the wheels are pierced, each needle creates “a highway for oxygen to enter into the interior of the cheese,” Sommer said. Those highways transport oxygen to the “streets” and “back roads” between the curds, allowing the spores to grow and develop flavor. If the curds are too small, they can collapse on themselves and restrict the flow of oxygen. When that happens, mold growth—and the development of flavor—is restricted to the hole created by the piercing needle, resulting in a cheese that’s fairly acidic and tastes more like feta than blue cheese. 

All blue cheeses are made with the same species of mold, Penicillium roqueforti.

Depending on the size of the wheel and the style of the blue cheese, each cheesemaker customizes how and when the piercing occurs. It can be done manually by inserting an individual needle into the wheel at various intervals or mechanically by inserting a number of needles welded onto a large plate into the wheels in unison. Roquefort, for example, is pierced about 40 times while wheels of Bayley Hazen Blue are pierced about 100 times. Cheeses with comparatively softer curd structures that are more prone to collapsing, such as Gorgonzola, may be pierced twice over a period of several days to ensure proper mold growth inside the wheels. Adjusting their piercing processes is an important way that cheesemakers can control mold growth, producing everything from the delicate, marble-like blue veining of Stilton to the big, hollow pockets of mold typical of Roquefort. 

Putting the Blue in Blue Cheese

  • The blue veins inside blue cheese are sometimes very regular and evenly spaced. It sometimes looks almost like the mold has been injected in the cheese. But that’s not how it works. Instead, spores of Penicillium roqueforti are added long before the curds are formed into wheels. The wheels are eventually pierced with stainless-steel needles; each opening creates a pathway for oxygen to enter and activate the dormant mold. The mold tends to grow best in the pathways created by the needles—which creates very even blue or green channels—but it also spreads out and grows in delicate, spidery patterns between the curds.

The Milk Matters

The milk is another major variable. Most blue cheeses, especially those made in the United States, are made with cow’s milk. There are a few notable exceptions, including Roquefort, which is made with sheep’s milk, and Valdeón, which is made mostly from cow’s milk and a bit of goat’s milk (and sometimes sheep’s milk). Compared to the grassy, tangy flavor of goat’s milk and earthy, gamy flavor of sheep’s milk, the flavor of cow’s milk is milder. But, depending on the breeds and their diets, even the flavors and colors of milks gathered from the same type of animal can vary. The milk of cows that eat a lot of fresh grass in summer will contain more carotenoids (plant pigments) and will appear darker in color, and the cheese made with it will have a yellow hue. According to David Gremmels, president of Rogue Creamery, a cheesemaker in southern Oregon, the flavor and composition of his herd’s organic milk is at its finest in the fall, so that is when he chooses to make his Rogue River Blue. Gremmels and other cheesemakers also stressed the importance of the milk’s freshness. The milks they use to make their cheeses sometimes come from their own herds and, in at least one case, can be transported from the dairy parlor where the cows are milked to the cheese vat in as little as 4 hours.

In many cases, the milk is treated in some way. It’s sometimes homogenized, a process that breaks down the fat globules so that they stay incorporated in the milk instead of rising to the top, which is not typically done with milk used to make other cheeses. “By breaking up the larger fat globules in the milk into smaller globules,” Sommer explained, “there will be more surface area of fat globules for the molds to act on, resulting in more flavor development.” In addition to generating bold blue cheese flavor, homogenized milk produces a cheese that’s very white in color and has a very creamy mouthfeel, two hallmarks of Danish blue cheeses and those inspired by them, including Point Reyes Farmstead Cheese Company Original Blue. Finally, the milk can be pasteurized at a high temperature to kill off potentially harmful organisms, treated at a relatively low temperature, or kept raw. In past comparisons of cheeses, we have sometimes found cheeses made with pasteurized milk to be milder than their raw-milk counterparts, but that is not the case with these blue cheeses. Due to the milk, mold, and cultures, even the mildest ones are rich in flavor.

FAQs about Storing Blue Cheese

We’ve assembled some of our most frequently asked questions about shopping for and storing blue cheese.

The Wheels Are Salted, Aged, and Wrapped

Blue cheeses come in a number of shapes and sizes. Cashel Blue, from Ireland, is formed into 3.3-pound wheels, while wheels of Gorgonzola can weigh as much as 26 pounds. After the wheels are formed, they’re salted or placed in a salt brine. In addition to flavoring the cheese, the salt pulls moisture out of the wheel and starts the formation of a dry, firm natural rind that eventually grows mold of its own. Manufacturers encourage rind development for many styles of blue cheeses. On the other hand, the exteriors of rindless blue cheeses, including Roquefort and Danish blues, are intended to have very little mold growth and instead be relatively smooth and mild. If any mold does form on the exterior, it is gently scraped off. Cambozola, a sort of Camembert-Gorgonzola hybrid made in Germany, is an outlier among blue cheeses. After the wheels are salted, they are sprayed with a white mold that produces the type of rind usually found on soft-ripened Brie and Camembert. 

The particulars of the aging process—both the length of time and the temperature and the humidity of the environment—also affect the flavors and textures of all blue cheeses. To start the aging process, wheels are usually placed in relatively warm, high-humidity environments to encourage the growth of the blue molds. Then, to control the rate of mold growth and to allow the cheese’s flavors to continue developing, the wheels are transferred to cooler, drier locations. Sommer pointed out that although they’re not readily available to many manufacturers, natural caves are ideal spots for aging blue cheeses because their conditions are very consistent. (By way of comparison, he described how the air rushes in or out of a cooler each time its door is opened.) There is another advantage to aging blue cheeses in caves: Many, including the natural limestone caves of Roquefort-sur-Soulzon in France and the sandstone caves of Faribault, Minnesota, act as a natural “sink,” absorbing the ammonia gases that are naturally produced as the cheeses age and mature. 

Mateo Kehler, of Jasper Hill Cellars in Vermont, uses a "cheese trier" to take a rind-to-center sample of a wheel of Bayley Hazen Blue. After he evaluates the texture and the development of blue veining, he'll return the sample to the wheel and reseal the exterior. Each batch is sampled multiple times during the aging process. Photo credit: Lilith Spencer for Jasper Hill

During the aging process, the wheels are turned regularly to ensure that they mature evenly. As the Penicillium roqueforti spores grow and build flavor and the starter cultures break down the cheese at a molecular level, the mold digests both protein and fat, creating a variety of smaller molecules with savory, mushroomy, tangy, buttery, herbaceous, or other flavor notes. Some blue cheeses that are aged for long periods of time develop crunchy crystals called brushites, which are similar in texture to those found in Parmigiano-Reggiano or aged gouda. At varying points during the aging process, some manufacturers coat their wheels with wax or place them inside loosely sealed plastic bags or plastic wrap. Sommer explained that these wrappings create “microenvironments” of precisely the right humidity, allow some oxygen to penetrate the cheese, and also prevent air currents from drying out the exteriors of the wheels. Thus protected, the interiors of these cheeses can continue aging until the desired texture is achieved. In some cases, as with traditional Valdeón and Rogue River Blue, the wheels are wrapped with leaves that have been sterilized, often by soaking in alcohol or liqueur. The leaves imbue the cheeses with an earthy flavor (plus the flavor of the liquid they’re soaked in) and act as a moisture barrier, giving the cheese a creamier texture. Those leaves generally remain on the cheeses when they’re shipped, but most other cheeses are uncovered and wrapped in aluminum foil. All told, the aging processes of the different cheeses we looked at can take anywhere from eight weeks to nearly a year. 

The Best Blue Cheese: It Depends on Your Preferences

The result of all the variations in manufacturing methods is a category of cheese with many distinct styles covering the full range of flavors: salty, sweet, acidic, bitter, and savory. Some are robust, piquant, and peppery, while others have a softer, mellower, earthy flavor. The textures of some are firm, but others are so soft that they’re almost gooey; they can be dense and fudgy or firm and crumbly. 

All the 14 blue cheeses featured here are unique and worth trying. They are listed by where they are made, with background information and tasting notes included to help you decide which ones suit your flavor and texture preferences. Whether you already love blue cheeses or are just beginning to explore them, I hope you’ll give a new one a try. 

Taste Test Blue Cheese

From mild, buttery Cashel Blue to peppery, piquant Roquefort, blue cheeses vary widely in flavor, texture, and intensity. There’s one for everyone—even the skeptics.

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16 days

Absolutely the best chicken ever, even the breast meat was moist! It's the only way I'll cook a whole chicken again. Simple, easy, quick, no mess - perfect every time. I've used both stainless steel and cast iron pans. great and easy technique for “roasted” chicken. I will say there were no pan juices, just fat in the skillet. Will add to the recipe rotation. Good for family and company dinners too. I've done this using a rimmed sheet pan instead of a skillet and put veggies and potatoes around the chicken for a one-pan meal. Broccoli gets nicely browned and yummy!

Absolutely the best chicken ever, even the breast meat was moist! It's the only way I'll cook a whole chicken again. Simple, easy, quick, no mess - perfect every time. I've used both stainless steel and cast iron pans. great and easy technique for “roasted” chicken. I will say there were no pan juices, just fat in the skillet. Will add to the recipe rotation. Good for family and company dinners too.

9 days

Amazed this recipe works out as well as it does. Would not have thought that the amount of time under the broiler would have produced a very juicy and favorable chicken with a very crispy crust. Used my 12" Lodge Cast Iron skillet (which can withstand 1000 degree temps to respond to those who wondered if it would work) and it turned out great. A "make again" as my family rates things. This is a great recipe, and I will definitely make it again. My butcher gladly butterflied the chicken for me, therefore I found it to be a fast and easy prep. I used my cast iron skillet- marvellous!

11 days

John, wasn't it just amazing chicken? So much better than your typical oven baked chicken and on par if not better than gas or even charcoal grilled. It gets that smokey charcoal tasted and overnight koshering definitely helps, something I do when time permits. First-time I've pierced a whole chicken minus the times I make jerk chicken on the grill. Yup, the cast iron was not an issue.