Cannabis Humidity Level for Long Term Storage: 58-62% RH

Target Humidity Range

The ideal relative humidity for long-term cannabis storage is 58% to 62%. Keep the temperature between 60°F and 68°F. Store buds in an airtight container in a dark place. These numbers slow mold growth and protect terpenes.

62 vs 58 humidity pack for weed

Why Humidity Matters

Mold grows on cannabis above 65% relative humidity. At 70% RH, mold can appear in 24 to 48 hours. Below 55% RH, buds dry out. Trichomes become brittle and break off. Terpenes evaporate. The smoke turns harsh. A humidity level of 58% to 62% keeps buds soft but not wet.

Cannabis Curing Containers With Humidity Packs: How to Store Buds Right

Signs of Wrong Humidity

Too high: white fuzz, ammonia smell, buds feel damp, stems bend without snapping.
Too low: buds crumble, smell fades, smoke burns hot, trichomes turn to dust.

Tools to Measure and Control

Use a digital hygrometer. Place it inside the jar. A two-way humidity pack holds 58% or 62% RH. Boveda and Integra Boost make these packs. Use one 8-gram pack for up to 1 ounce of flower. Use a glass jar with a rubber gasket and a clamp lid. Plastic bags and sandwich containers let air in.

how to use humidity packs for marijuana

Storage Steps

Dry fresh buds to 10% to 12% moisture before storage. A stem snaps when ready.
Place buds in a glass jar. Fill the jar 75% full. Leave space for air.
Add a hygrometer and a humidity pack.
Keep the jar at 60°F to 68°F. Away from light.
Open the jar for 5 minutes each day for the first week. Then open for 5 minutes each month.

How Long Cannabis Lasts

At 58% to 62% RH, cannabis keeps quality for 6 months to 1 year. After 1 year, THC drops by 10% to 20%. Terpenes fade. Flavor turns flat. A sealed jar with a humidity pack extends the window to 2 years for some strains. Freezing is not recommended. Cold breaks trichomes and adds moisture when the jar warms.