The nacho cheese came out of the slow cooker an hour ago and there is still some left. Or maybe you have a can of Rico’s that you opened on game day and aren’t sure whether to put the rest in the fridge or in the trash. Does nacho cheese need to be refrigerated?
Short answer: Yes, once opened or created, always. Unopened canned nacho cheese can be stored. The moment nacho cheese is opened, exposed to air, or made from scratch, it is a perishable dairy product and must be refrigerated and used immediately. The only question is how fast, but that depends on the type.
For more information on comparing shelf life of seasonings and fresh produce, check out our complete guide to food preservation.
Important points
- All opened nacho cheese must be refrigerated. There are no exceptions to any type.
- Unopened canned nacho cheese: Can be stored in the pantry until opened. No need to refrigerate before opening.
- The two-hour rule is solid: Nacho cheese that has been left at room temperature for more than 2 hours should be discarded.
- Rico’s says to eat within 4 days after opening. Then refrigerate. No preservatives added.
- Tostitos’ question: Refrigerate after opening. Can be used for up to 2 weeks. Can be used for up to 2 months.
- Homemade or restaurant queso: Refrigerate immediately. Please use up within 3-4 days.
- Reheating unsafe cheese does not make it safe. If it’s been sitting too long, throw it away.
Unopened and opened: two completely different rules
There are two completely different answers to the refrigerator question, depending on whether the can or jar is open.
Before opening: Commercially available canned nacho cheeses (ricos, rosalita, ortega que bueno) are shelf-stable and do not require refrigeration. The commercial canning process sterilizes the contents and creates a sealed environment that keeps the product safe at room temperature for up to 18 months. Store unopened cans in a cool, dark pantry. Do not refrigerate before opening. Freezing only wastes space and provides no benefit.
After opening: The moment the seal is opened, the contents are exposed to air, environmental bacteria, and potential contaminants. Store all opened nacho cheese in the refrigerator. This applies to all types: canned, bottled, homemade, etc.
How long does each type last in the refrigerator?
| type | Refrigerate after opening? | how long does it last |
|---|---|---|
| Ricos canned nacho cheese | Yes — right away | 4 days (by manufacturer) |
| rosarita nacho cheese sauce | Yes — right away | up to 1 week |
| Tostitos Queso (bottled) | Yes — right away | Best within 2 weeks. Safe for up to 2 months |
| homemade queso | Yes – within 2 hours | 3-4 days |
| Restaurant Queso (Takeout) | Yes – within 2 hours | 3-4 days |
Why you can’t give up nacho cheese
The two-hour rule is non-negotiable.
Nacho cheese is a dairy-based sauce that contains milk solids, real or processed cheese, and often cream. Dairy products are one of the most common vehicles for foodborne illness, as their room temperature provides an ideal environment for bacterial growth. The USDA defines the temperature danger zone as 40°F to 140°F. Nacho cheese left at room temperature will quickly move into this zone.
of F.D.A. Two-hour rule applies. Nacho cheese that has been left at room temperature for more than 2 hours should be discarded. If the outdoor temperature is above 90°F, that time frame is reduced to 1 hour.
Importantly, it is not safe to reheat cheese that has been left out too long. Some bacterial toxins are heat stable and can withstand cooking temperatures. A safe choice is to always discard cheese that is older than 2 hours rather than reheating and serving it.
Game Day and Party Serving: How to Stay Safe
Nacho cheese at parties is one of the most common food safety issues in home kitchens. Here’s how to do it right:
Warm up using a slow cooker set. If you’re serving the nacho cheese over a few hours, use a small slow cooker on the lowest setting to keep the cheese above the danger zone of 140°F. Check the temperature regularly with a food thermometer.
Take it out of the refrigerator little by little and enjoy. Rather than serving all the cheese at once, refrigerate the main cheese and refill portioned plates from the refrigerator little by little. This limits the time of the portion at room temperature.
Set a timer. Two hours can go by quickly during a party. Set reminders so you never lose track of when you’re out of cheese.
Do not mix fresh and old cheese. Do not add fresh cheese to a bowl that already contains cheese. Old cheese may already have reached its limit.
What happens if you don’t refrigerate opened nacho cheese?
Why preservatives alone are not enough
Even brands that contain preservatives (Tostitos, Rosarita) are not safe to leave at room temperature after opening. The preservatives in these products are designed to slow spoilage when the product is sealed and refrigerated and are not intended to provide long-term storage of the product once opened. If you open it and let it sit at room temperature, the preservative will slow the process, but it won’t stop it. In warm environments suitable for dairy products, bacterial growth still occurs and is significantly accelerated.
The risks are even more pressing in the case of Licos, which has no added preservatives. The company’s four-day refrigerated guidelines are more than just a quality recommendation. This reflects the actual shelf life of preservative-free dairy products after exposure to air.
Storage best practices
The correct way to store nacho cheese
Immediately transfer opened canned cheese to an airtight container. Cans are not suitable for storage in the refrigerator. Transfer unused portion to a sealed glass or plastic container immediately after opening. This prevents metallic odors from escaping the can and keeps the cheese properly sealed.
Refrigerate within 2 hours after opening or consuming. Don’t leave the nacho cheese on the counter while you finish your meal. Return it to the refrigerator immediately.
Press the plastic wrap directly onto the surface of the cheese. Before sealing the container, press plastic wrap onto the surface of the cheese to prevent crust formation and reduce exposure to air.
See also
Never double dip. Lycos clearly warns against this. Saliva introduces enzymes that break down the cheese emulsion and promote spoilage. Use a clean spoon to serve the chips instead of dipping them directly from the storage container.
Store it on the main shelf, not the refrigerator door. The temperature of the door changes every time you open it. The main shelf at the rear keeps perishable dairy products in the most stable and cool condition.
Label with opening date. The date is displayed on the container so you always know exactly how long the cheese has been opened.
Do not freeze licos. The manufacturer does not explicitly recommend it. Freezing will destroy the texture. Other brands may allow freezing for cooking purposes, but the quality will be reduced.
Recipes using nacho cheese
FAQ
Is it okay to put nacho cheese in the slow cooker and leave it warm all day?
Only if the slow cooker keeps the cheese above 140°F continuously. Check using a food thermometer. If the slow cooker temperature drops below 140°F at any point, the cheese enters the danger zone and the clock starts. A slow cooker with a “warm” setting is not guaranteed to stay above 140°F all the time, especially since it heats and cools between cycles. Check regularly and discard any cheese that has been in the uncertainty zone for more than 2 hours cumulatively.
Should I put unopened nacho cheese in the refrigerator?
No, unopened commercial canned nacho cheese (Licos, Rosalita, Ortega) is shelf-stable and does not need to be refrigerated before opening. Store in a cool, dark pantry away from heat sources. After opening, transfer the contents to an airtight container and store in the refrigerator immediately.
I reheated the leftover nacho cheese from yesterday. Is it safe?
Yes, it is safe to reheat and eat as long as the cheese has been properly refrigerated within two hours of last use and has been in the refrigerator for no more than four days (for licos) or two weeks (for tostitos). If cheese is left at room temperature for more than 2 hours, it is not safe to reheat. Some bacterial toxins survive reheating. If in doubt, discard it.
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Source: Better Living – onbetterliving.com
