Quick answer: Once you smoke THCA or heat it any other way, it turns into THC, and your body handles it exactly like THC from any cannabis. Urine tests usually detect it for 1 to 3 days after one use, about a week or more with regular use, and up to a month or longer with heavy daily use. Saliva tests catch it for about a day, blood for hours, and hair for up to about 90 days.
There is no special “THCA timeline.” Heat changes THCA into delta-9 THC, and your body breaks that THC down into metabolites that stick around much longer than any effects you feel. Here is how long, by test type and by how often you use it.
How long THCA stays in your system, by test type
| Test | What it looks for | Typical detection window |
|---|---|---|
| Urine | THC-COOH (a THC metabolite) | 1 to 3 days after a single use; a week or more with regular use; 30 days or longer with heavy daily use |
| Saliva | THC | Usually up to about 24 hours; sometimes longer in frequent users |
| Blood | THC and metabolites | Usually a few hours; can be longer in frequent users |
| Hair | THC or THC-COOH | Up to about 90 days for a standard 1.5-inch sample |
These are general ranges from medical sources and research, not promises. Your own window can be shorter or longer.
How long THCA stays in your urine, by how often you use it
Urine tests are the most common, so this is the number most people want. How often you use matters more than anything else.
| How often you use | Typical urine window |
|---|---|
| One time | About 1 to 3 days |
| A few times a week | About 5 to 7 days |
| Daily | About 10 to 15 days |
| Several times a day, for months | 30 days or longer |
In one study of chronic users, a heavy user still tested positive about 24 days after stopping. That is why heavy daily users should plan on a month or more.
Why THCA shows up like THC
THCA is the raw acid form of THC in the cannabis plant. When you light a joint or pack a bowl, the heat removes part of the molecule and turns it into delta-9 THC. This is called decarboxylation, and it happens in seconds.
Your liver then breaks THC down into THC-COOH. THC-COOH dissolves in fat, so your body stores it and releases it slowly. That slow release is why it can be detected long after you stop feeling anything.
A drug test can’t tell hemp THC from marijuana THC. For the full testing picture, read Does THCA Show Up on a Drug Test?
What changes how long THCA stays in your system
- How often you use: the biggest factor. Daily users build up stores of THC-COOH.
- How much you use: stronger flower, concentrates and bigger sessions all add up. See What Is a High THCA Percentage?
- Body fat: THC-COOH is stored in fat, so people with more body fat may stay detectable longer.
- Metabolism: everyone processes cannabinoids at a different speed.
- The test cutoff: federal workplace urine tests screen at 50 ng/mL and confirm at 15 ng/mL. A lower cutoff catches smaller amounts for longer.
- How you take it: smoking and edibles both lead to THC-COOH. Edibles made with decarbed flower are mostly THC, so they count too.
What about raw THCA?
Raw, unheated THCA does not turn into much THC, so in theory it should show up less. But there is very little research on it, and THCA flower always contains some delta-9 THC already. More forms as flower ages. Don’t count on raw THCA to keep you clear.
How long do THCA effects last?
The effects wear off long before a test stops seeing it. When smoked, most people feel THCA within minutes, notice a peak within about 30 minutes, and feel back to normal in about 2 to 4 hours. Homemade edibles take longer to start and can last 6 hours or more.
Can you get THCA out of your system faster?
Not in any reliable way. Detox drinks, masking products and heavy exercise right before a test don’t have good evidence behind them, and many labs check samples for tampering. Time is the only thing that clears THC-COOH.
If you could be tested for work, sports, probation or anything else, the safest choice is not to use THCA products at all.
How long does THCA stay in your system: FAQ
How long does THCA stay in your urine?
Usually 1 to 3 days after one use, about a week or more with regular use, and 30 days or longer with heavy daily use.
How long does THCA stay in your saliva?
Usually up to about 24 hours. Frequent users can test positive a bit longer.
How long does THCA stay in your blood?
Usually a few hours, though it can be longer for frequent users.
How long does THCA stay in your hair?
Hair tests can usually detect use for up to about 90 days. Use from the last week or so may not show yet.
Does THCA stay in your system longer than delta-9?
No. Once heated, THCA becomes delta-9 THC, so the timeline is the same. See THCA vs Delta-9.
Will one hit of THCA show up on a drug test?
It can. A single use is often detectable in urine for 1 to 3 days, depending on the test cutoff and your body.
This article is general information, not medical advice. If you take medication or have a question about a test, talk to your doctor or the testing program’s medical review officer. Not facing a test? Browse our lab-tested THCA flower. For adults 21+.
