There is a tin of mixed nuts left from last Christmas, or a bowl of in-shell nuts that has been on the coffee table since Thanksgiving. Do mixed nuts go bad? They do, and how long a mix keeps depends on its ingredients, freshness, packaging and storage. Here is what extension guides, USDA and FDA say about mixed nut shelf life, rancidity, mold and recalls.
Do mixed nuts go bad?
The Short Answer
Yes. Their oils can turn rancid, and moisture can encourage mold. The sources we reviewed list nuts in general, not mixed nuts specifically, and give different quality estimates by packaging and temperature. For unopened products, follow the package date and storage directions. Guides list about 4 months for unopened in-shell nuts and 3 months to 1 year for an unopened vacuum can. Once opened, Kansas State and the Pacific Northwest guide list 2 weeks and 1 month at 70°F, and NDSU lists 4 to 6 months refrigerated. Refrigerate after opening, and freeze for longer storage. Colorado State puts walnuts, pecans and Brazil nuts at the short end of its nut shelf-life ranking, so check your mix’s ingredients. These are quality estimates, not a promise of safety. Discard nuts with mold, and don’t eat a mix that matches a recall notice.
For a complete pantry and fridge reference, see our Food Storage Guide. For single nuts, see whether almonds, pecans, pistachios, walnuts, peanuts, cashews and chestnuts go bad.
Hosting this season? See whether eggnog, champagne, ham and cranberry sauce go bad.
Mixed Nuts: At a Glance
Unopened vacuum can
12 months (Pacific Northwest Extension, NDSU) or 3 months at 70°F (Kansas State)
Other unopened packaging
3 months (NDSU). Follow the date on the package
In shell, unopened
4 months (Pacific Northwest Extension, Kansas State, NDSU)
Opened, room temperature
2 weeks (Kansas State) to 1 month (Pacific Northwest Extension) at 70°F. Refrigerate after opening
Opened, refrigerator
4 to 6 months (NDSU)
Freezer (0°F or colder)
Extension guides say freeze for longer storage. NDSU Prairie Fare: up to 1 year
Shorter-lived nuts
Walnuts, pecans and Brazil nuts are at the short end of Colorado State’s ranking
Moldy mixed nuts
Discard them. USDA’s mold page lists nuts under “Discard”
Recalled mix
Don’t eat it. Follow the recall notice
“Best by” date
A quality date, not a safety date, per USDA
Key Takeaways
The sources we reviewed give no storage times for mixed nuts, so the figures come from guides that list nuts as a group.
Colorado State gives a general ranking of shortest to longest shelf life: walnuts, pecans, Brazil nuts, peanuts, almonds, pistachios, cashews and hazelnuts. It gives no times.
Package type matters. Pacific Northwest Extension and NDSU list 12 months for an unopened vacuum can, Kansas State lists 3 months, and NDSU lists 3 months for other unopened packaging.
Kansas State and Pacific Northwest Extension say to refrigerate nuts after opening. NDSU lists 4 to 6 months for an opened
