Best Humidity for Curing Cannabis: The Curing Humidity Chart
The best humidity for curing cannabis is 58-62% RH inside a sealed jar. Stay in that band and buds cure smoothly, keeping their aroma and potency; drift too high and you risk mold, too low and the cure stalls. Below you will find a full curing humidity chart by stage, plus exactly how to lower humidity when a jar runs damp.
Curing usually takes two to four weeks, and humidity is what makes or breaks it. The right level lets buds release moisture slowly while enzymes break down chlorophyll, which is what turns harsh, freshly dried flower into smooth, aromatic weed. Terpenes like myrcene and limonene drive that aroma, and they are exactly what you lose if the jar dries out too fast.
Recommended Strains
Colombian Gold
|
THC | 16% - 19% (Medium) |
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Type | Feminized |
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Yield | Medium |
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Phenotype | 25% Indica / 75% Sativa |
Colombian Gold Auto
|
|
THC | 21% - 25% (High) |
|
|
Type | Autoflowering |
|
|
Yield | High |
|
|
Phenotype | 25% Indica / 75% Sativa |
| Stage | Target humidity (RH) | Notes |
|---|---|---|
| Drying (hanging buds) | ~45-55% room RH | 60-70°F, slow and dark, 7-10 days until small stems snap |
| Curing, weeks 1-2 (in jars) | 58-62% | Burp jars daily for 5-10 minutes |
| Curing, weeks 2-4+ (in jars) | 58-62% | Burp every few days; buds get smoother over time |
| Long-term storage | 55-62% | Add a 2-way humidity pack; keep cool, dark and sealed |
In short, the best humidity for curing cannabis is 58-62% RH inside the jar. Higher risks mold; much lower stalls the cure and strips terpenes.
Why Humidity Matters When Curing Cannabis
Why Humidity Matters
Humidity controls the pace of the cure. Enough moisture keeps enzymes active so chlorophyll and sugars break down, which is what removes that grassy harshness. Too little and the process simply stops; too much and mold takes hold. Using the curing humidity chart above as a reference keeps you in the safe 58-62% window at every stage.
In practice the sweet spot is 55-65% relative humidity inside the jar, with around 62% a popular target. Go much below 55% and the cure stalls while the buds dry out harsh; go above 65-70% and you risk mold. A two-way humidity pack plus a small hygrometer in the jar takes the guesswork out and holds the range steady.
Does Strain Type Change the Ideal Humidity?
Bud density matters more than indica-versus-sativa labels. Dense, chunky buds (often indica-leaning) trap moisture, so they sit comfortably at the top of the range, around 60-62%. Airier, fluffy buds (often sativa-leaning) dry faster and hold less water, so they do well nearer 58-60%. When in doubt, 60% suits almost everything.
Promos & Deals
How to Lower Humidity in Curing Jars
Step-by-Step: Burping and Lowering RH
- Open the jar and let it stand for 5-10 minutes so moist air escapes and fresh air enters.
- Give it a gentle turn or shake to move the buds, then reseal.
- Check the hygrometer; if it reads above 65%, burp again later that day.
- If RH stays above 70%, spread the buds on a screen or in a paper bag for a few hours to shed excess moisture.
- Repeat daily for the first two weeks, then every few days as levels stabilize.
Tools: Hygrometers and Humidity Packs
A small digital hygrometer inside each jar is non-negotiable; it is the only way to know your true RH and react before mold starts. Cheap analog dials are unreliable, so use a calibrated digital one and check it daily during the first two weeks.
Two-way humidity packs are the easiest way to hold a jar steady. Rated at 58-62%, they both absorb and release moisture to keep RH constant, which is why they are the go-to for the best humidity pack for curing weed and for long-term storage. Drop one in beside the buds and it does the fine-tuning for you, though you should still burp early on.
Advanced: Curing Chambers
If you cure large or frequent harvests, a dedicated curing chamber gives you room-level control over humidity and temperature at once. By holding conditions steady across many jars it produces a more even, repeatable cure than burping by hand, which is why serious growers eventually move to one.
A chamber can be as simple as a repurposed wine fridge with a humidity controller, or a purpose-built unit for serious volume. The appeal is room-level control of humidity and temperature at once, so every jar cures evenly. It is overkill for a single plant, but for large or frequent harvests the smoother, more consistent result pays for itself.
Pro Tips for Curing Cannabis
- Hold 58-62% RH in the jar. Below 55% arrests the cure and dries out terpenes; above 65% invites bud rot within a couple of days.
- Use a calibrated digital hygrometer, not an analog one, and put it inside the jar for a true reading.
- Burp jars daily for the first two weeks to release moisture, then taper to every few days.
- Add a 2-way humidity pack (58-62%) to hold levels steady and prevent swings.
- Run a dehumidifier in the room if your climate is humid, rather than aiming a fan into the jars.
- Store jars cool, dark and sealed to protect cannabinoids and terpenes from light and heat.
FAQs: Curing Cannabis Humidity
What should the humidity be in a curing jar?
The best humidity for curing cannabis in a jar is 58-62% RH, with 55-65% as the safe outer range. This lets buds release moisture slowly, preserving terpenes and cannabinoids while keeping mold away. Denser buds sit near 62%, airier buds near 58%. A 2-way humidity pack makes hitting this range effortless.
How do I lower humidity in a curing jar?
Burp the jar: open it for 5-10 minutes so damp air escapes and fresh air enters, and repeat daily. If RH stays above 65%, run a room dehumidifier or add a 58-62% humidity pack. For an emergency above 70%, spread the buds on a screen or in a paper bag for a few hours, then re-jar.
How often should I burp curing jars?
Burp daily for the first two weeks, opening each jar for 5-10 minutes to swap out moist air and check the hygrometer. After that, taper to every two or three days as the RH stabilizes around 60%. Well-cured buds can then be sealed with a humidity pack for long-term storage.
At what humidity does curing stop?
Curing effectively stops when jar humidity falls below about 55% RH. At that point the buds are too dry for the enzymatic reactions that smooth out flavor, so the cure stalls and terpenes start to fade. If a jar reads under 55%, add a 62% humidity pack to rehydrate slightly and restart the process.
Can I use a fan to reduce humidity in curing jars?
Do not aim a fan into the jars; it dries buds unevenly and blows off terpenes. Instead, improve airflow in the room and use a dehumidifier to bring ambient humidity down. Inside the jar, rely on burping and a humidity pack. Gentle room circulation, not direct wind, is what protects a smooth cure.
Can you cure different cannabis strains in the same jar?
You can, and the humidity will equalize between them, but it is not ideal. Buds with different moisture levels can push each other out of the safe range, and strong aromas transfer, so a pungent strain will scent a milder one. For best flavor and mold safety, cure distinct strains in separate labeled jars.
Dialing in curing humidity is easier when the rest of your environment is under control. See our guides on the best dehumidifier for a grow tent for humid rooms, and on setting up a grow tent humidifier if your air runs too dry.
