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How to store cannabis.
Good storage does two jobs. It keeps your cannabis fresh, and it keeps it away from children and pets. Both come down to a few simple habits.
What makes cannabis go stale
- Light and heat: in a multi-year study, THC broke down faster in samples kept in light at room temperature than in samples kept dark and cold. As THC breaks down, it turns into CBN, so the product slowly loses potency.
- Air and time: THC oxidation and terpene loss continue over time. One study found terpenes, the aroma compounds, decreased rapidly under every storage condition tested.
- Grinding: the same study found whole, unground buds stored cool held up best.
- Humidity: California requires dried flower to pass a water-activity test meant to keep microbes in check. Damp storage works against that, so keep cannabis dry.
Storage by product
| Product | How to store it |
|---|---|
| Flower and pre-rolls | Airtight container, cool and dark. Keep buds whole until you use them. |
| Edibles and drinks | Original child-resistant package. Refrigerate if the label says “Keep refrigerated” or “Refrigerate after opening.” |
| Vapes | In the package, away from heat, such as a hot car. |
| Concentrates | Original airtight container, cool and dark. |
There’s no single shelf life. Storage conditions matter more than the calendar, and if the aroma has faded, potency may have dropped too.
Keep it away from children and pets
The California Department of Public Health recommends that you:
- Keep cannabis products in a locked, childproof container.
- Keep the container out of sight and out of reach of children and pets.
- Keep products in the original childproof packaging from the store.
- Reseal packages after use.
- Dispose of cannabis where it can’t be easily seen or reached.
Pediatricians suggest storing cannabis the way you’d store medications, and keeping edibles away from regular snacks.
If a child eats cannabis, call California Poison Control at 1-800-222-1222, or 911 in an emergency. If a pet does, call your veterinarian or the ASPCA Animal Poison Control Center at 888-426-4435 (a fee may apply).
On the move
In a vehicle, keep cannabis sealed. An opened package or loose flower belongs in the trunk. If you grow at home, California requires plants, and any harvested cannabis over 28.5 grams, to be kept in a locked space at the residence, out of public view.
Sources
- Trofin IG et al. Revista de Chimie (2011). Influence of storage conditions on the chemical potency of herbal cannabis
- Zamengo L et al. Forensic Science International (2019). The role of time and storage conditions on the composition of hashish and marijuana samples: a four-year study
- Meili L et al. Frontiers in Plant Science (2020). Metabolic profiling of cannabis secondary metabolites for evaluation of optimal postharvest storage conditions
- California Code of Regulations, Title 4, § 15717. Moisture content and water activity testing
- California Department of Public Health. Cannabis safety measures
- California Department of Public Health. Cannabis poisoning
- California Department of Cannabis Control. Responsible cannabis use
- American Academy of Pediatrics, HealthyChildren.org. Edible marijuana dangers: how parents can prevent THC poisoning
- ASPCApro. Marijuana toxicosis in animals
- California Vehicle Code § 23222. Open containers of cannabis in vehicles
- California Health and Safety Code § 11362.2. Personal cultivation and storage of harvested cannabis
This guide is general education, not medical or legal advice. Talk to a doctor about your health, and check current California law.