You opened a package of tempeh and it’s covered in white fuzz with a few dark spots. Looks like it went bad. You are about to throw it away. Before you make it: This is exactly what fresh, healthy tempeh is supposed to taste like. Knowing just one fact will save you from throwing away perfectly good food more than once.
Does tempeh go bad?
The short answer: Yes, but the signs of spoilage are different from most foods because tempeh is a live fermented product. Opened tempeh will keep for 3 to 5 days in the refrigerator in an airtight container. Unopened refrigerated tempeh is generally good for 5 to 7 days past the expiration date when kept cold at all times. White mold and black or gray spots are normal and harmless. Pink, green or blue mold means throw away. A smell of ammonia means rejection.
For a broader overview of how fermented and plant-based foods are stored, check out our Food Storage Guide. If you also cook with tofu, see Does tofu go bad?
Key takeaways
Opened tempeh: 3 to 5 days in an airtight container in the refrigerator Unopened refrigerated tempeh: 5 to 7 days past expiration date if still cold Vacuum pasteurized tempeh (most store bought): can last for weeks past the expiration date, unopened Cooked tempeh: 3 to 5 days airtight in the refrigerator Freezer: up to 3 to 6 months; slight change in texture but not dangerous White fluffy coating and black or gray spots: normal, no deterioration Pink, green, blue or orange mold: spoilage, discard immediately Ammonia or strong chemical odor: spoilage, discard Ambient temperature limit: 2 hours Why tempeh is different from other foods Tempeh is made by inoculating cooked soybeans with a mold culture called Rhizopus oligosporus and allowing it to ferment. The mold binds the soybeans together into a dense cake and creates the white mycelium layer you see on the outside. This coating is not a sign of deterioration. It was the mold culture that produced the tempeh in the first place, and it continues to grow slowly in the refrigerator.
Much of the confusion around tempeh spoilage comes from applying the wrong framework to it. For most foods, visible mold means they should be thrown out. For tempeh, white, fluffy mold on the surface is a sign of a healthy, active product. The question is not whether there is mold. The question is what color it is.
Most store-bought tempeh has been pasteurized, which kills live cultures and greatly extends shelf life. Pasteurized tempeh will show less visible mold activity in the package, but the same indicators of spoilage apply. Fresh, unpasteurized tempeh from specialty markets or Asian grocery stores contains live cultures and will have more visible mycelium growth. Both types must remain refrigerated and follow the same time windows.
How long does tempeh last? Type Fridge Freezer Unopened, fresh or vacuum packed 5 to 7 days after the expiration date 3 to 6 months Open, raw 3 to 5 days airtight 3 to 6 months Cooked tempeh 3 to 5 days airtight 3 to 6 months The sell-by date on tempeh is a storage guide for the store, not a strict safety limit. Unopened tempeh that has been kept continuously cold often stays good for several days. The best before or best before date is a better guide when printed. Once opened, the time since opening matters more than any date on the package.
The Mold Color Guide: What’s Normal and What’s Not This is the most important section for anyone new to cooking with tempeh. The color of mold on tempeh tells you almost everything you need to know about whether it’s safe.
Normal and safe
White plush coating: The Rhizopus mycelium that makes tempeh what it is. A thick white fluff on the outside of the block is a sign of a fresh, well-fermented product. It should be present throughout the block, binding the soybeans together. Black or gray spots: Mature Rhizopus spores. As the mold culture ages, the white mycelium develops black or gray spots where it reproduces. This is a normal part of the fermentation life cycle. Spots may give tempeh a slightly stronger flavor but do not indicate spoilage. Overall light gray tint: As the tempeh ages in the refrigerator, the white exterior gradually takes on a gray tint. Normal. If the smell and texture are good, the tempeh is fine. Not normal. Discard immediately.
Pink mold: Contamination by a foreign mold species, not by Rhizopus. Discard the entire block. Green mold: Contamination. Throw. Blue mold: Contamination. Throw. Orange or yellow spots: Contamination. Throw. Blurred growth of any color other than white or gray: Contamination. Throw. The rule is simple: white and gray are from the Rhizopus culture and are safe. Any other color means a foreign organism has taken hold and the tempeh should not be consumed.
How to tell if tempeh has gone bad The color of the mold is the first control, but not the only one. Healthy tempeh has a sweet, earthy, mushroom-like smell with a slight yeasty or nutty note. It should smell like a good mushroom or a quality piece of bread: earthy and sweet, without anything pungent or chemical. The smell becomes stronger and more pungent as the tempeh ages, which is normal, but it should never smell like ammonia, sharp chemicals, or anything rotten.
Signs that tempeh has gone bad
Ammonia or chemical smell: The clearest signal of deterioration. A slight ammonia note can develop in aging tempeh and is a sign to cook it immediately rather than storing it further. A strong ammonia odor or strong chemical odor means rejection. Don’t cook through it and hope the smell will go away. Pink, green, blue or orange mold: As described above. Contamination by foreign molds. Discard the entire block without cutting around the affected area. Viscous texture: Fresh tempeh is firm and slightly dry on the surface. A slimy or wet coating means bacterial growth and spoilage. The soybean has turned dark brown or black inside: The beans inside the fresh tempeh should be tan or cream in color when you cut into the block. Dark brown or black beans inside may indicate excessive fermentation. Dark spots on the inside alone are not always a definitive signal for elimination since Rhizopus spores can grow both indoors and outdoors. Judge by smell and texture as well as color. If the interior darkening is accompanied by an ammonia odor or a slimy texture, throw it away. Crumbling without mold structure: The tempeh should hold together once sliced. A block that disintegrates into grains without visible mycelium binding them has degraded beyond the point of use. Note that frozen and thawed tempeh is naturally more crumbly than fresh. Thawed tempeh that crumbles but smells and looks normal is safe to cook. After the time window: Opened tempeh older than 5 days should be thrown away regardless of its appearance. Best Storage Practices
Store the tempeh in its original packaging until you are ready to use it. After opening, wrap the unused portion tightly in plastic wrap or transfer to an airtight container and refrigerate immediately. Store toward the back of the refrigerator, not in the door, for a consistent temperature Don’t store tempeh in water like you would tofu. It does not need to be submerged and excess moisture can encourage unwanted mold growth. Label of opened tempeh with opening date If you don’t use an opened block within 5 days, freeze it immediately rather than waiting to see if it holds. Why fermentation doesn’t make tempeh last forever
See also
Fermenting tempeh gives it the natural antimicrobial properties of Rhizopus mycelium, which is why it resists spoilage longer than unfermented soy products like fresh tofu. But fermentation does not create a shelf-stable product. Tempeh still contains plenty of moisture and protein and promotes bacterial growth if left at room temperature or kept in the refrigerator for too long. The USDA two-hour rule applies: Tempeh left at room temperature for more than two hours should be refrigerated or discarded. At warm temperatures, the live fermentation culture also accelerates rapidly, which accelerates overfermentation and makes the tempeh stronger, more bitter and ultimately dangerous.
Can you freeze tempeh? Yes, and it’s the best way to significantly extend shelf life when you have more than you can use within 3-5 days. Tempeh freezes better than tofu. The dense, firm structure is less likely to break down than the water-heavy structure of fresh tofu.
After thawing, the texture may be slightly more crumbly than fresh tempeh, but it holds up well enough for most culinary applications, including stir-fries, crumbled dishes, and marinades. To freeze: Wrap the block tightly in plastic wrap, place it in a freezer bag, expel as much air as possible, and freeze for up to 3 to 6 months. Thaw overnight in the refrigerator rather than at room temperature. Use within 24 to 48 hours of thawing.
Further reading Does tofu go bad? Should tofu be refrigerated? Does soy sauce go bad? Does miso paste go bad? Does sesame oil go bad? Chinese Chicken Lettuce Wraps Teriyaki Pork Bowls Rainbow spring rolls Does tempeh go bad FAQ Is it safe to eat tempeh with white mold? Yes. The white mold on tempeh is the Rhizopus oligosporus culture that fermented the soybeans in the first place. This is not a sign of deterioration. This is the sign of a fresh and active product. Tempea, a tempeh producer, describes the The white, fluffy exterior as the healthiest state the product can be in. Eat it normally. The only mold colors that mean rejection are pink, green, blue and orange.
What do black spots on tempeh mean? Black spots on tempeh are mature Rhizopus spores and not contamination. As the mold culture ages, the white mycelium develops black or dark gray spots where it reproduces. This is a completely normal stage in the fermentation life cycle and tempeh is safe to consume. Blackheads may contribute to a slightly stronger, more intense flavor. If the smell is good and the texture is firm, black spots are no reason to throw them away.
How long does tempeh last after opening? Opened tempeh will keep for 3 to 5 days in the refrigerator when stored in an airtight container. This applies to raw tempeh that you have cut but not yet cooked. Cooked tempeh will also keep for 3 to 5 days airtight in the refrigerator. If you know you won’t use the remainder of an open block in this window, freeze it immediately rather than letting it sit.
What does bad tempeh smell like? Bad tempeh smells like ammonia or sharp chemicals. Fresh tempeh has an earthy, mushroom-like, slightly yeasty smell that is pleasant and recognizable. As we age, the smell gets stronger and more pungent, which is normal. The line is crossed when the smell turns into ammonia or something rotten. If you are unsure, checking smell is more reliable than color for tempeh which is borderline aged.
Can you eat tempeh after the expiration date? Often yes, if the package is still sealed and the tempeh has remained consistently cold. The sell-by date tells the store when to rotate inventory, not when the product becomes unsafe. Unopened refrigerated tempeh is often good for 5-7 days past the expiration date. Vacuum pasteurized tempeh may last longer. Open it, check the smell, check the color of the mold, and use the complete spoilage guide above. If this passes, it’s okay to cook and eat.
My tempeh tastes bitter. Did it go wrong? Not necessarily. Bitterness in tempeh is usually a sign of overfermentation, meaning the Rhizopus culture is past its peak and the flavor has intensified. d beyond the soft, nutty baseline. Overly fermented tempeh is generally safe to eat but less pleasant on its own. Cooking it with a strong marinade, soy sauce or sauce usually masks the bitterness effectively. Bitterness only becomes a signal for elimination when it is accompanied by an ammonia odor, slimy texture or foreign mold color. Bitterness alone, without any other warning signs, is a quality problem rather than a safety problem.
Better Living may earn commissions through affiliate links and may occasionally offer sponsored or partnered content. If you make a purchase through our links, we may receive a small commission at no cost to you.