cannabis curing jar setup
A cannabis curing jar setup pairs airtight amber glass, a hygrometer, and two-way humidity packs to hold flower at a steady 58–62% while it cures.
How many jars for curing weed?
Plan on one quart Mason jar per ounce of dried flower. Fill each jar to roughly 75 percent of its volume, so buds sit loose with air around them. A one-pound harvest needs about 16 quart jars. A half-pound harvest needs about 8 quart jars. An ounce needs one quart jar or two pint jars.
Jar count by harvest weight
- 14 grams (0.5 oz): 1 pint jar
- 28 grams (1 oz): 1 quart jar, or 2 pint jars
- 112 grams (4 oz): 4 quart jars
- 224 grams (8 oz): 8 quart jars
- 448 grams (16 oz): 16 quart jars, or 8 half-gallon jars
These counts assume dense buds at about 58 to 62 percent relative humidity. Airy sativa buds take more space, so add one spare jar per four.
Why fill jars only 75 percent
Curing is a slow exchange of moisture and air. Buds need room to breathe. A packed jar traps moisture against the flower, which raises mold risk and slows the cure. The top quarter of the jar holds the air pocket that buffers humidity swings. Wide jars give more surface area than tall, narrow jars of the same volume.
Jar sizes and capacity
- Half-pint (8 oz): about 7 grams
- Pint (16 oz): about 14 grams
- Quart (32 oz): about 28 grams
- Half-gallon (64 oz): about 56 grams
Use glass Mason jars with airtight lids and a rubber gasket. Plastic containers hold odor and can carry static, which pulls trichomes off the flower.
how long to cure cannabis in jars
What you need
- Clean quart Mason jars with lids
- Calibrated hygrometer, one per jar or one per group
- Small humidity packs for large jars
- Labels and a marker
- Dark, cool storage space near 60 to 70 degrees F
Steps to prep and fill jars
- Dry the flower until small stems snap instead of bending.
- Trim fan leaves and sugar leaves from the buds.
- Wipe each jar and lid with isopropyl alcohol.
- Let the jars air dry.
- Fill one jar to the 75 percent mark with loose buds.
- Place a hygrometer inside the jar above the flower.
- Seal the lid.
- Label the jar with the strain and date.
- Repeat the fill for each jar and keep the same headspace.
Burping schedule
- Open each jar for 5 to 10 minutes on day one.
- Repeat the open step twice a day for the first week.
- Check the hygrometer at each burp.
- Note the reading in a log.
- Reduce to one open per day in week two if humidity holds at 58 to 62 percent.
- Open once a week in weeks three and four.
- Seal jars for long storage after four weeks when the smell settles.
When to add or remove a jar
If the hygrometer reads above 65 percent after 24 hours, spread the buds on a tray for an hour, then refill the jar. If it reads below 55 percent, the cure has stalled. Add a humidity pack and give it a week. If buds feel wet on the outside but stems are dry, split the contents into two jars to increase air space.