Is THCA legal in Washington?
Washington wrote one of the strictest lines in the country: any detectable THC in a consumable product makes it cannabis, and THCA is counted.
The short answer: Not as hemp. Washington treats any product meant to be inhaled or ingested “with any detectable amount of THC” as a cannabis product, and it counts THCA when measuring THC concentration (RCW 69.50.101). Only state-licensed cannabis retailers may sell high-THCA flower, to adults 21 and over. Status as of Oct. 3, 2026.
Washington at a glance
| Question | Answer, as of Oct. 3, 2026 |
|---|---|
| THCA flower through hemp retail | Closed |
| THCA flower through licensed cannabis retail | Open, 21+ |
| Line between hemp and cannabis products | Any detectable THC in a consumable |
| THC measure | THC plus THCA |
| Per-sale limit | 1 oz usable cannabis (RCW 69.50.360) |
| Regulator | Washington State Liquor and Cannabis Board (LCB) |
| Federal change | Dec. 11, 2026 |
Two definitions that close the gap
Washington’s controlled substances act handles THCA flower in two lines.
First, RCW 69.50.101 defines “cannabis products” as usable cannabis, concentrates and infused products, “including any product intended to be consumed or absorbed inside the body by any means including inhalation, ingestion, or insertion, with any detectable amount of THC.” There is no 0.3 percent allowance for a smokable or edible product; detectable is enough.
Second, the same section defines “THC concentration” as the percent of THC in the plant or product “or the combined percent of tetrahydrocannabinol and tetrahydrocannabinolic acid.” THCA is counted by statute.
Those amendments came in 2023, through SB 5367, which aimed at intoxicating hemp products sold outside the licensed system. Hemp itself remains defined by reference to the state’s agriculture code, RCW 15.140.020, and growers can still farm it. What they cannot do is sell a consumable with detectable THC except through the licensed cannabis supply chain.
The licensed market
Washington began adult-use retail sales in 2014. LCB-licensed retailers sell flower that is tested and tracked as cannabis, with THCA levels on the label that match or exceed hemp-labeled flower sold elsewhere. Adults 21 and over may buy up to an ounce of usable cannabis per transaction, plus specified amounts of solid and liquid infused products and concentrates.
Already stricter than Congress
Washington’s “any detectable THC” rule for consumables is already stricter than the federal container cap that arrives with the THCA change on Dec. 11, 2026 (federal dates), so buyers in the state see no practical difference.
For Washington buyers
- Buy from LCB-licensed retailers; the board publishes licensee lists.
- Hemp-labeled THCA flower mailed into the state is, under Washington’s definitions, a cannabis product sold without a license.
Sources
- RCW 69.50.101, definitions; RCW 69.50.360, retail sales
- Washington State Liquor and Cannabis Board, notice on SB 5367
Last reviewed Oct. 3, 2026, by the state desk. Not legal advice.
Washington THCA questions
Is THCA flower legal in Washington state?
Not as hemp. RCW 69.50.101 defines cannabis products to include anything meant to be inhaled or ingested 'with any detectable amount of THC,' and defines THC concentration as THC plus THCA. Only Liquor and Cannabis Board-licensed retailers may sell high-THCA flower, to adults 21 and over.
How much cannabis can a Washington retailer sell an adult at once?
Under RCW 69.50.360, a licensed retailer may sell a person 21 or older up to 1 ounce of usable cannabis in a transaction, along with set amounts of infused products and concentrates.
When did Washington close the hemp THC market?
The 2023 law SB 5367 brought consumable products with any detectable THC into the cannabis definition, so they must move through the licensed system.
Disclosure: THCA Group sells flower. State Pages are reported and edited apart from the market; this page is not an offer to sell or ship into Washington, and no Order Request is confirmed before an Operator has spoken with the buyer.
Not legal advice: read the statute, and ask a lawyer licensed in Washington. Every state · Shop