Baked Goods
How long does packaged yeast last?
A sealed packet of yeast keeps 2 years in a cool, dry pantry, but once it’s open USDA moves it to the cold: 4 months in the fridge or 6 months in the freezer.
How long does it keep?
| Pantry, from purchase | 2 years |
|---|---|
| Fridge, opened | 4 months |
| Freezer | 6 months |
- Pantry, from purchase: Store in cool, dry place. Must be refrigerated or frozen once opened.
Can you freeze yeast? YES, FREEZE IT →
Can it sit out?
Unopened, packaged yeast is shelf-stable. Once opened, treat it as perishable — the FSIS 2-hour rule applies.
Perishable food left at room temperature for more than 2 hours should be thrown out — 1 hour if it’s 90°F or hotter (a picnic, a hot car, a summer kitchen).
How to tell if packaged yeast has gone bad
- No foam or froth when you proof a pinch in warm sugar water
- A flat, cardboard smell instead of the yeasty tang
- Granules clumped together from a damp scoop
When in doubt, throw it out.
Proof a pinch before you commit five cups of flour to it — dead yeast is the one pantry failure you can test for in a glass.
Quick answers
How long does packaged yeast last?
A sealed packet of yeast keeps 2 years in a cool, dry pantry, but once it’s open USDA moves it to the cold: 4 months in the fridge or 6 months in the freezer.
Can you freeze packaged yeast?
Once the packet is open, yeast belongs in the cold — USDA gives it 6 months in the freezer against 4 months in the fridge.
How long can packaged yeast sit out?
Sitting out isn’t the safety question for unopened packaged yeast — once opened, the FSIS 2-hour rule applies. Perishable food left at room temperature for more than 2 hours should be thrown out — 1 hour if it’s 90°F or hotter (a picnic, a hot car, a summer kitchen).