Shelf Stable Foods
How long does molasses last after opening?
Unopened molasses keeps 1–2 years in the pantry and 6 months once opened — it’s sugar, so it fails slowly, going flat and stale-tasting before anything else.
Pantry, from purchase
How long does it keep?
| Pantry, from purchase | 1–2 years |
|---|---|
| Pantry, opened | 6 months |
Can it sit out?
Molasses is shelf-stable, so sitting out at room temperature isn’t the safety question — storage time is.
How to tell if molasses has gone bad
- Mold blooming on the surface or around the cap threads
- A boozy, fermented smell
- Sugar grown into grit through a bottle that used to pour smooth
- A thin, watery layer sitting on top
When in doubt, throw it out.
Wipe the neck before you re-cap — dried molasses on the threads is where mold gets its foothold.
Quick answers
How long does molasses last after opening?
Unopened molasses keeps 1–2 years in the pantry and 6 months once opened — it’s sugar, so it fails slowly, going flat and stale-tasting before anything else.
How long can molasses sit out?
Sitting out at room temperature isn’t the safety question for molasses — storage time is.