Does Your Coffee Have Mold in It?

The honest answer is: it depends on what kind of coffee you're drinking.

Mold in coffee is a real risk. It's not a myth invented by wellness influencers, and I'm not going to pretend otherwise. Coffee grows in warm, humid climates. It goes through fermentation during processing. If beans are improperly dried, stored in damp conditions, or left sitting long enough in a warehouse that isn't climate controlled, mold can develop. The toxic compounds mold produces, called mycotoxins, have been detected in coffee samples in peer-reviewed studies. That part is true.

What's also true is that the risk depends almost entirely on the quality of the coffee and how it was handled every step of the way from the farm to your cup.

Where Lower-Grade Coffee Falls Short

Commodity-grade coffee, the kind you'd get at the grungiest of gas stations, is more likely to contain mycotoxins for a simple reason: the economics don't reward quality. When farmers are paid poorly for their crop, there's little financial incentive to invest in meticulous drying, careful sorting, or controlled storage. Beans get harvested indiscriminately, dried inconsistently, and moved through supply chains that prioritize volume over quality. Warm, humid conditions at any point in that journey create the conditions mold needs to grow.

This is where the fear has a legitimate foundation. Poorly handled, low-grade coffee is a different product from specialty coffee, not just in flavor, but in how it was treated at every stage of production.

What Makes Specialty Coffee Different

Specialty coffee isn't just a marketing term. It refers to beans that have been evaluated and scored by certified Q Graders, professionals trained and certified by the Coffee Quality Institute, against a 100-point scale. To earn a specialty designation, a coffee must score above 80. Fungal damage is a Category 1 defect under the Specialty Coffee Association's grading system. One moldy bean can disqualify an entire lot from specialty classification.

That means the grading process itself is a mold screening. Moldy beans don't make it through. They never reach a specialty roaster.

Chris Kornman, Director of Education at Royal Coffee and one of the most respected voices in green coffee, has written about this extensively. His position: coffee is not a meaningful source of mycotoxins, and industry-wide improvements in processing and handling have driven mycotoxin levels in commercial coffee down significantly over the past two decades.

James Hoffmann, likely the most recognized coffee educator in the world, commissioned independent lab tests across a range of coffees — from inexpensive grocery store bags to high-end specialty to premium "mold-free" branded products. Every sample came back well below EU safety limits, and all of the specialty coffees tested with no mold detectable. The expensive lab-certified brands tested identically to everything else.

Fear Sells

Fear is one of the most effective sales tactics in existence. And using a partial truth to generate that fear — yes, mold exists in agriculture; no, specialty coffee is not putting you at meaningful risk — is effective precisely because it can't be called an outright lie. The concern is real. The conclusion being sold to you is not supported by evidence.

Among specialty coffee professionals, "mold-free" marketing is widely viewed as exploiting health-conscious consumers by manufacturing a problem and then selling the only solution. Even worse? I've tried several of the products, and in my personal opinion, they don't even taste that great. So you're paying a premium for an inferior product, because of nothing but fear.

What I Do on My End

I don't just buy specialty-grade beans. I buy exceptional beans. A grade of 80 is the floor to be called specialty, but my standard is much higher. That means the level of care from the producers is that much higher, and that is the foundation. But how those beans are handled after they leave the farm matters too, and I take that seriously.

• 1
  Kept off the ground Mold thrives in the moisture that accumulates at floor level. Direct contact with any surface that holds humidity is an easy risk to eliminate, so every bag stays elevated.
• 2
  Climate-controlled storage I store all my green coffee in my office, where the temperature stays controlled and never climbs above 76 to 77 degrees Fahrenheit, and humidity stays under 60%. I measure both constantly with multiple devices. One notifies me if humidity hits 60%.
• 3
  No temperature swings or humidity fluctuations Temperature swings and humidity fluctuations are two of the primary drivers of mold growth. A consistent environment removes that risk entirely.
• 4
  Moisture content measured on every lot I verify moisture content with a digital moisture meter. Specialty-grade green coffee should come in at 10 to 11 percent moisture, with 13 percent as the absolute ceiling. I verify this on every lot. It's not something I take on faith from the supply chain.

The Bottom Line

If you're buying the cheapest coffee you can find, with no roast date and no information about where it came from or how it was processed, the mold conversation is worth having.

If you're buying specialty-grade coffee from a roaster who sources carefully, handles beans properly, and roasts to order, take the premium money you'd spend on "mold-free" coffee and spend it on a bag of coffee that actually tastes premium instead.

That's what you're getting with Hawk Coffee. You won't get a fancy lab certificate and a pretty stamp on the bag that jacks up the price of average coffee. You will get delicious coffee, handled right, from someone who actually cares what ends up in your cup.

Have other questions about coffee? I answer the most common ones on the Coffee Brewing Guides & FAQ page.

Neal Reasland is the owner and roaster at Hawk Coffee Roasters in Valrico, FL, serving Brandon, Lithia, FishHawk, Riverview, and Bloomingdale.