Cannabis Dry and Cure Humidity Chart: Target RH by Stage
A stage-by-stage cannabis dry and cure humidity chart with target RH, temperature, airflow, and burping guidance for a clean, steady finish.
Hold the dry room at 58-62% relative humidity with the air at 60-70°F (15-21°C). Keep the room dark, move air with a gentle fan, and plan on 10-14 days. Below 58% RH, buds dry too fast and lose smell. Above 62% RH, mold risk climbs. Read the range at canopy height with a calibrated hygrometer, not at the wall.
Cannabis Dry and Cure Humidity Chart: Target RH by Stage
Why 58-62% RH
This range slows water loss while keeping the surface of the bud dry enough to resist mold. Slow drying gives chlorophyll time to break down and protects terpenes. A room at 58-62% RH and 60-70°F is a working target for small harvests. Large rooms need more sensors and more airflow control, but the range stays the same.
cannabis drying humidity in tent
Equipment to set first
- Calibrated hygrometer and thermometer
- Dehumidifier with a continuous drain
- Cool-mist humidifier or steam humidifier
- Oscillating fan for indirect air
- Dark room or light-blocking cover
- Drying racks or lines with space between buds
How to set the room
- Calibrate the hygrometer with a salt test or a reference meter.
- Place sensors at canopy height in two spots, away from doors and walls.
- Set the room temperature to 60-70°F.
- Set the dehumidifier to hold 60% RH.
- Set the humidifier to hold 58% RH.
- Point the fan at a wall or ceiling, not at the buds.
- Seal light gaps and block windows.
- Load buds with space between them and no pileups.
- Record the first RH and temperature reading.
Daily checks
- Read RH and temperature at canopy height at the same time each day.
- Squeeze a test bud to check surface dryness, then return it.
- Refill the humidifier before it runs dry.
- Empty or check the dehumidifier drain.
- Adjust fan speed if buds move or leaves flutter.
- Log the readings and note any drift.
Troubleshooting drift
RH drops below 58%
Lower fan speed, close the door, and raise the humidifier output in small steps. Do not mist the buds. If the room is above 70°F, cool it first, then adjust humidity.
best hygrometer for drying cannabis
RH climbs above 62%
Raise dehumidifier output, add a second sensor, and open the room for short air exchanges. Check for packed buds and wet trim. If RH stays above 65%, spread the buds into a thinner layer.