Moldy Cheese Day 🧀

Overview

Moldy Cheese Day, celebrated annually on October 9th, is an unofficial holiday dedicated to appreciating and enjoying the distinctive flavors and textures of cheeses ripened with beneficial molds. From the pungent notes of blue cheeses to the creamy, earthy profiles of Brie and Camembert, this day encourages gourmands and casual enthusiasts alike to explore the diverse world of these unique dairy products, which owe their characteristic qualities to specific fungal cultures.

Origin and story

The blue veins in cheeses like Roquefort, Gorgonzola, and Stilton are caused by the *Penicillium roqueforti* mold.

The white rind on cheeses such as Brie and Camembert is formed by *Penicillium camemberti* or *Penicillium candidum*, which contributes to their creamy texture and earthy aroma.

Quick facts

• DateOctober 9
• TypeFood / Dessert
• Great forFoodies, Chocolate lovers, Home bakers

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Ways to celebrate

The mold in blue cheese is a controlled culture, not spoilage — and researchers recently watched it genuinely evolve in real time inside an aging cave, in an experiment that started, unexpectedly, with a marriage proposal.

Try some intentionally moldy cheese

Celebrate by:

• Trying a blue cheese variety you've never had, like Roquefort, Gorgonzola, or Stilton.
• Pairing a blue cheese with something sweet, like honey or fruit, to balance the sharpness.

See the science behind the mold

Helpful resources:

• Scientists Watch Fungi Evolve in Real Time, Thanks to a Marriage Proposal in a Cheese Cave (Smithsonian Magazine)

Did you know?

The mold responsible for blue cheese's flavor, Penicillium roqueforti, produces up to 200 distinct compounds as it grows through tiny air channels punched into the cheese — that's where the sharp, tangy taste actually comes from.

Fun facts

• The blue veins in cheeses like Roquefort, Gorgonzola, and Stilton are caused by the *Penicillium roqueforti* mold.
• The white rind on cheeses such as Brie and Camembert is formed by *Penicillium camemberti* or *Penicillium candidum*, which contributes to their creamy texture and earthy aroma.
• The molds used in cheese production are specially cultivated and are safe to consume, playing a crucial role in the cheese's aging, flavor development, and texture.

Sources and attribution

Scientists Watch Fungi Evolve in Real Time, Thanks to a Marriage Proposal in a Cheese Cave (Smithsonian Magazine)

External links may lead to third-party websites.

Continue your streak

Open one more holiday before you go to build daily momentum.

• Yesterday: American Touch Tag DayQuick context from the day before.
• Tomorrow: Angel Food Cake DayKeep the streak going with tomorrow's pick.
• Random pick: National Banana Bread DayJump to another surprise holiday.
• Popular: National Beer DayA fan favorite with broad appeal.

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FAQ

When is Moldy Cheese Day?

It is observed on October 9 each year.

What is Moldy Cheese Day?

Moldy Cheese Day, celebrated annually on October 9th, is an unofficial holiday dedicated to appreciating and enjoying the distinctive flavors and textures of cheeses ripened with beneficial molds. From the pungent notes of blue cheeses to the creamy, earthy profiles of Brie and Camembert, this day encourages gourmands and casual enthusiasts alike to explore the diverse world of these unique dairy products, which owe their characteristic qualities to specific fungal cultures.

How do people celebrate Moldy Cheese Day?

Try a blue cheese variety you've never had, like Roquefort or Gorgonzola, paired with something sweet like honey.

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