# Long-term storage

> Keeping cured cannabis for months or years with minimal loss, by holding it cool, dark, airtight and at a stable water activity of about 0.55-0.65.

- Canonical: https://genetixbay.com/knowledge/glossary/long-term-storage.html
- Also written: cannabis storage, storing cannabis, stash storage, storing buds, long term storage
- Glossary category: Harvest, drying and curing · Evidence: Established
- Status: Draft: awaiting expert review · Updated: 2026-10-31
- Licence: CC BY-SA 4.0 (https://creativecommons.org/licenses/by-sa/4.0/), attribute "GenetixBay cannabis glossary"

Long-term storage covers what happens after the cure. The enemies are light, heat, oxygen and moisture swings. [THC](https://genetixbay.com/knowledge/glossary/thc.md) degrades slowly to [CBN](https://genetixbay.com/knowledge/glossary/cbn.md) mostly through oxidation, and [terpenes](https://genetixbay.com/knowledge/glossary/terpene.md) evaporate. Stored dark at room temperature, cannabis keeps reasonably well for one to two years; in light and warmth the loss is much faster (Fairbairn et al. 1976; Zamengo et al. 2019).

## In practice

The basics:
- **Container**: airtight glass, filled well to limit headspace; opaque or kept in a dark cupboard.
- **Temperature**: cool and stable, roughly 15-21 °C (60-70 °F) or cooler; avoid heat swings.
- **Moisture**: stable around 0.55-0.65 aw, set by a proper cure.
- **Light**: none. UV and visible light speed THC breakdown.
- **Handling**: open as little as possible.

Freezing [cured](https://genetixbay.com/knowledge/glossary/curing.md) flower is debated. Frozen [trichome heads](https://genetixbay.com/knowledge/glossary/trichome-heads.md) become brittle and break off with handling. If you freeze, seal airtight first and let jars warm fully before opening to avoid condensation.

House position: [humidity packs](https://genetixbay.com/knowledge/glossary/humidity-pack.md) are not needed, a marketing gimmick that robs terpenes.

## Don't confuse with

- **Curing**: the active finishing phase, with [burping](https://genetixbay.com/knowledge/glossary/burping.md).
- **Seed storage**: seeds need drier conditions and cold.
- **Vacuum sealing**: can crush buds; it's one storage option, not a must.

## Related terms

[Water activity](https://genetixbay.com/knowledge/glossary/water-activity.md), [Terpene loss](https://genetixbay.com/knowledge/glossary/terpene-loss.md), [Curing](https://genetixbay.com/knowledge/glossary/curing.md), [Humidity pack](https://genetixbay.com/knowledge/glossary/humidity-pack.md)

## Read more

- [Long-term storage: keeping cured flower potent and aromatic](https://genetixbay.com/knowledge/harvest-cure/long-term-storage.md)

## Sources

1. Fairbairn JW, Liebmann JA, Rowan MG. 1976. The stability of cannabis and its preparations on storage. Journal of Pharmacy and Pharmacology 28(1):1-7. https://doi.org/10.1111/j.2042-7158.1976.tb04014.x
2. Zamengo L, Bettin C, Badocco D, et al. 2019. The role of time and storage conditions on the composition of hashish and marijuana samples: a four-year study. Forensic Science International 298:131-137. https://doi.org/10.1016/j.forsciint.2019.02.058
3. ASTM D8197. Standard Specification for Maintaining Acceptable Water Activity (aw) Range (0.55 to 0.65) for Dry Cannabis Flower. ASTM International. https://store.astm.org/d8197-22.html