How to store cannabis so it stays fresh
Light, air, heat, and humidity are what age your flower. Simple storage rules, and how long flower, edibles, and carts actually keep.
Updated July 7, 2026 4 min read
Cannabis doesn't spoil like milk, but it does degrade: THC slowly converts to CBN (sleepy, less euphoric), terpenes evaporate, and flower dries to dust or, worse, molds if kept damp. Four enemies do the damage: light, oxygen, heat, and wrong humidity.
The setup that works
An airtight glass jar, stored in a cool dark cupboard, solves most of it. UV light is the fastest degrader, so opaque or tinted jars beat clear ones on a sunny shelf. Aim for roughly 55-65% relative humidity. The two-way humidity packs sold at dispensaries hold that range for months.
What to avoid
Skip the refrigerator and freezer for flower: temperature swings pull moisture in and freezing snaps trichomes off. Plastic baggies build static that strips resin, and stashing near appliances or windows cooks off terpenes. Keep everything locked away from kids and pets; edibles especially look like ordinary snacks.
How long things keep
Well-stored flower stays great for 6-12 months. Sealed edibles follow the food they're made of: gummies outlast baked goods by months. Vape carts and concentrates hold a year or more in cool darkness. If flower smells like hay or nothing at all, its terpenes are gone; if you see fuzz or smell must, throw it out.
Frequently asked questions
Does weed expire?
It degrades rather than expires: potency and flavor fade over about a year, and damp storage can grow mold. Moldy cannabis should be discarded.
Should I keep cannabis in the fridge?
No. Fridge and freezer temperature swings add moisture and damage trichomes. A cool, dark cupboard in an airtight glass jar is better.