To cure cannabis well, dry it slowly first, then cure it in glass jars. Oregon State University Extension gives slow drying targets of about 64 to 70 F (18 to 21 C) and 50 to 55 percent relative humidity. Jar buds when small stems snap, fill jars about three quarters full, open them daily in week 1 and less often after that, then store sealed in a cool, dark place.

Why curing matters

Harvest day is not really the finish line. How you dry, cure and store your buds shapes their smell, flavor and smoothness as much as the last weeks of flower do. A slow dry and a patient cure let moisture leave the buds evenly, from the inside out. Rushing either step tends to leave buds that smell grassy or harsh, or that stay too wet in the middle and risk mold in the jar.

Good storage is what protects all that work. Buds kept sealed, cool and dark can hold their quality for many months, while buds left in a warm, bright spot lose it much faster.

Before the cure: drying

Curing only works on buds that were dried properly first. Oregon State Extension recommends a slow dry at about 18 to 21 C, which is about 64 to 70 F, with relative humidity of 50 to 55 percent. NC State Extension adds that good airflow matters, with humidity at 60 percent or less.

How long drying takes depends on your room. UVM Extension’s Hemp 101 notes that plants can take anywhere from 3 to 14 days to fully dry down, depending on airflow, humidity and temperature. In a 2021 University of Vermont drying trial, hemp flower dried at room temperature with fans was pulled after about four days with a dehumidifier and about six days without one. Drying time varies, so judge by the stem snap test.

A common grower rule of thumb is to jar buds when small stems snap instead of bending. If they still bend, give them a bit more time.

How to dry and cure, step by step

1. Hang branches in a dark room at about 64 to 70 F and 50 to 55 percent humidity.
2. Jar when small stems snap instead of bending.
3. Fill glass jars about three quarters full and add a small hygrometer.
4. Open jars daily for a few minutes in week 1, then less often.
5. Oregon State gives 45 to 55 percent RH for storage.
6. After the cure, store sealed, cool and dark.

The 10 tips

1. Cure at the right light, temperature and humidity

Keep jars in the dark and at a steady temperature. Oregon State gives storage conditions of about 18 C, which is about 64 F, and relative humidity between 45 and 55 percent. Utah State University Extension explains why: “Higher temperatures, as well as light and oxygen, can degrade cannabinoids and reduce flower quality.”

Oregon State also gives a target of 55 to 65 percent for the moisture content of the flower itself during the cure. That figure is the water inside the buds, not the humidity of the room or the air in the jar, so do not use it as a hygrometer target.

2. Burp your cannabis on time

Opening jars lets out moisture and lets in fresh air. Follow the burp schedule below.

3. Choose glass

Wide mouth glass jars with tight lids are the best choice for curing and storing. Many plastic containers are not airtight, and trichomes stick to plastic. Plastic bags are the worst option.

4. Seal well for storage

Once the cure is done, seal jars tightly so buds stop curing and do not dry out. A vacuum sealing kit made for jars is one option. Do not vacuum seal buds into plastic bags.

5. Consider nitrogen packs

Some growers use food grade nitrogen packs to push oxygen out of storage containers. It takes extra time and supplies, and most home growers simply seal jars well instead.

6. Keep jars out of direct light

Jars look nice on a shelf, but store them in a dark cabinet or closet, away from sunlight.

7. Do not let jars get too warm

A closed cabinet can heat up in summer. Keep jars in a cool spot that stays close to Oregon State’s storage temperature.

8. Do not freeze your cannabis

Freezing makes resin brittle, so it can shake off the buds. Fridges also have shifting humidity, so they are a poor place for open jars.

9. Keep jars sealed

Once buds move into storage, avoid opening jars just to check on them. Every opening lets in air and moisture.

10. Open one jar at a time

Store in smaller jars so you open less at once. Take out what you need, then reseal right away, and watch the hygrometer.

A note on labels

Label every jar with the strain, harvest date and the date you started the cure. When you run several strains at once, it is easy to mix them up, and the dates tell you at a glance which jars still need burping. A short note on how each jar smelled at week 1, week 2 and week 4 also helps you judge your drying and curing next time, since you can see which conditions gave the best results in your space.

Burping schedule

Time	How often to open	How long
Week 1	Daily	A few minutes each time
Week 2	Every few days	A few minutes each time
Week 3 and after	Less often, about once a week	Briefly, to check smell and humidity

If the hygrometer reads high and stays there, see the troubleshooting table. Always smell the buds and look for fuzzy spots when you open a jar.

Signs the cure is going well

A good cure smells better each week. The grassy smell from fresh drying fades and the strain’s own aroma comes forward. Buds should feel dry on the outside but not crumble, and the jar hygrometer should stay steady between burps. If humidity climbs back up after each burp, the buds still hold extra moisture, so keep burping more often until readings stay put.

Calibrate your hygrometer

Small hygrometers are often off by a few percent, so test yours before you trust it. The salt test is simple, and Seedbank, a seed shop, notes that “Saturated salt solution stabilizes at 75% RH at room temperature.”

1. Mix table salt with a little water into a damp paste in a small cap.
2. Seal it with the hygrometer in a zip bag.
3. Wait 6 to 8 hours.
4. Read it. It should show 75 percent. Note the offset.

If it reads 72 percent, for example, add 3 to every reading from then on. For more on how temperature and air change humidity, see https://kindseed.com/what-factors-affect-relative-humidity-control-for-cannabis/.

Troubleshooting

Sign	Likely cause	What to do
Jar humidity stays high	Buds jarred too wet	Separate the buds and check them carefully. Discard anything moldy
Hay smell	Can happen during drying or curing	Check dryness, airflow and storage again. Curing will not fix moldy material, so throw it out.
Ammonia smell	Too wet in jar	Open, dry, check for mold
Fuzzy white or gray spots	Mold	Discard affected buds. Do not consume moldy material
Buds crumble	Over dried	Over drying cannot be fully undone. Store sealed and dry slower next time

NC State Extension warns that after drying, flower must be kept dry “or it will absorb moisture and may mold.” That is why a jar hygrometer and steady storage conditions matter so much. If in doubt about mold, throw it out.

For more grow and harvest guides, see https://kindseed.com/seed-bank-blog/.

Sources: Oregon State University Extension, Post Harvest Processing of Hemp Flowers (https://extension.oregonstate.edu/catalog/post-harvest-processing-hemp-flowers). NC State Extension, Hemp Harvest Timing and Drying (https://hemp.ces.ncsu.edu/hemp-harvest-timing-and-drying/). Utah State University Extension (https://extension.usu.edu/crops/research/ten-frequently-asked-questions-about-growing-cannabis). UVM Extension, Hemp 101 (https://www.uvm.edu/d10-files/documents/2024-06/2020_Hemp_101.pdf). University of Vermont Extension, 2021 Hemp Cannabidiol Drying Trial (https://www.uvm.edu/d10-files/documents/2024-08/2021_Hemp_Cannabidiol_Drying_Trial.pdf). Seedbank, THCFarmer, Leafly and Herb grow guides.

FAQ

What humidity should you aim for inside curing jars?

Oregon State gives 45 to 55 percent RH for jar storage. If it stays high, the buds may have been jarred too wet, so check them for mold.

What storage temperature keeps cured flower stable?

Oregon State Extension gives about 18 C, which is about 64 F, for storage. Keep jars cool, dark and steady, and avoid warm cabinets in summer.

Why burp jars during the cure?

Burping lets out moisture and lets in fresh air, so humidity stays in range while the cure finishes. Open daily in week 1, then less often.

Should you freeze cannabis for long term storage?

No. Freezing makes resin brittle, so it can shake off the buds. Sealed glass jars in a cool, dark place work better.

How long should I cure?

Most of the change happens in the first few weeks. Open jars daily in week 1, every few days in week 2, then about once a week. Many growers cure for several weeks before moving buds into sealed storage.