Best Method recommended method with best effort-to-efficacy tradeoff 2-3 months
Pantry Then Fridge (Commercial)
- Keep in a cool, dark pantry for 2-3 months after opening per the National Peanut Board
- Seal the lid tightly between uses
- Move to the fridge after the pantry window to keep quality extends usable life another few months
- Always use a clean utensil to avoid introducing crumbs or moisture
Alternative another good method that's just different 6-9 months
Refrigerated (Natural)
- Stir thoroughly to reincorporate the separated oil
- Refrigerate after opening to slow further oil separation natural jars have no stabilizers and can go rancid faster at room temp
- Alternatively: store the jar upside down in the pantry to redistribute oil
- Let a cold jar warm slightly before spreading if it stiffens
Fun Facts
- Commercial peanut butter keeps far longer than natural because added stabilizers like hydrogenated oil bind the peanut oil so it cannot separate or go rancid as fast.
- Storing a natural jar upside down lets the oil migrate back down through the peanut solids, so it self-mixes instead of pooling at the top.