How Long Does Sugar Last?
Granulated and powdered sugar keep indefinitely in the pantry when stored dry in a sealed container. The best-by date, often about 2 years, refers to texture only. Hard or lumpy sugar is still safe to use.
Sugar — dry (uncooked)
shelf life- Prepared: 1 month in the fridge
Fridge at 40°F (4°C) or below · freezer at 0°F (−18°C). Freezer times are for best quality; frozen food stays safe longer.
Granulated white sugar is nearly pure sucrose with almost no water, and it binds any moisture so tightly that bacteria and mold cannot grow in it. That makes it one of the few foods that never truly spoils. What goes wrong with sugar is physical: it absorbs humidity and hardens, picks up odors, or attracts ants.
How to store sugar
- Pour sugar from its paper bag into an airtight canister. Paper lets humidity in, which is what turns sugar into a brick, and it is no obstacle to ants.
- Keep sugar away from the stove, kettle and dishwasher vent, and always use a dry spoon; a few drops of water create hard lumps.
- Store it apart from strongly scented foods like coffee, onions and spices, because sugar absorbs odors over time.
- Break up hardened granulated sugar by pulsing it in a food processor or tapping the bag with a rolling pin; sift powdered sugar that has clumped.
How to tell if sugar has gone bad
- Ants, other insects or insect debris in the container.
- An off smell picked up from neighboring foods or cleaning products.
- Visible mold or wet, syrupy patches, which happen only if a significant amount of water got in.
- Hard lumps or a solid block are not spoilage; the sugar has absorbed and then lost moisture and is still safe.
Bacteria that cause food poisoning usually do not change the look, smell or taste of food. Go by the time limits first, and the signs above second.
Sugar shelf life chart
| State | Fridge | Freezer | Pantry |
|---|---|---|---|
| Dry (uncooked) | Not recommended | Not recommended | Indefinitely |
| Pantry is the right place. Cold storage is never needed, and fridge humidity or condensation makes sugar cake into lumps. | |||
| Prepared | 1 month | Not recommended | Not recommended |
| Homemade simple syrup, 1:1 sugar and water, in a clean sealed bottle. Discard if cloudy or moldy. | |||
Not safe = perishable: no more than 2 hours at room temperature (1 hour above 90°F / 32°C). Not recommended = possible, but quality suffers or it serves no purpose.
Frequently asked questions
Does sugar ever expire?
No, not in a food-safety sense. Sugar's extremely low moisture prevents microbial growth, so it remains safe indefinitely if kept dry and clean. Manufacturers print a best-by date of roughly two years because sugar can clump or pick up odors, not because it becomes harmful.
Is hardened sugar still good?
Yes, hardened white sugar is completely safe and works normally once broken up. Lumps form when the sugar absorbs humidity and dries again. Crush them in a food processor, grate the block, or warm it briefly in a low oven and then break it apart.
Does powdered sugar go bad?
Powdered sugar keeps indefinitely as well, though it clumps more easily than granulated sugar. It contains a small amount of cornstarch to keep it free-flowing. Sift out lumps before using it in frosting, and discard it only if it smells off or has gotten wet.
How long does homemade simple syrup last?
Basic 1:1 simple syrup lasts about 1 month in the fridge in a clean, sealed bottle. Once sugar is dissolved in water it loses its protection, and mold or cloudiness can develop. Rich 2:1 syrup keeps longer. Discard any syrup that looks cloudy or has floating specks.
How do I keep ants out of sugar?
Store sugar in a container with a gasketed, screw-on or clamp lid, and wipe spilled grains from the outside and the shelf. Ants cannot get through a true airtight seal. If ants are already inside the sugar, discard it rather than trying to sift them out.
Related foods
| Food | Fridge | Freezer | Pantry |
|---|---|---|---|
| Brown Sugar Opened |
Not recommended | 1–2 years | Indefinitely |
| Honey Opened |
Not recommended | Not recommended | Indefinitely |
| Maple Syrup Opened |
1 year | 2 years | Not recommended |
| Flour Dry (uncooked) |
1 year | 1–2 years | 6–12 months |
| Cornstarch Dry (uncooked) |
Not recommended | Not recommended | Indefinitely |
| Salt Opened |
Not recommended | Not recommended | Indefinitely |
More baking staples: Baking Powder, Baking Soda, Cornmeal, Whole Wheat Flour, Yeast.
Reviewed 2026-09-20. Times follow published USDA FoodKeeper / FSIS, FDA and CDC storage guidance; where sources differ we use the shorter time. How we compile this data.