Is THCA Legal in Washington?

Last reviewed: May 22, 2026

Restricted. Washington treats any product with detectable THC as a cannabis product under SB 5367 (2023), which means high-THCA hemp flower lands inside the licensed cannabis system rather than at general hemp retail. Adults 21 and over can buy THCA flower from a WSLCB-licensed retailer; smokable THCA flower from unlicensed hemp shops and out-of-state online retailers is not permitted in Washington.

Washington Cannabis & Hemp Overview

Washington legalized adult-use cannabis through Initiative 502 (2012), one of the first two U.S. states to do so. The Washington State Liquor and Cannabis Board (WSLCB) administers the licensed cannabis market under RCW Chapter 69.50, the state's Uniform Controlled Substances Act. The Washington State Department of Agriculture (WSDA) administers hemp cultivation under RCW Chapter 15.140 (the Washington Hemp Production Act). Adults 21 and over may possess up to 1 ounce of useable cannabis, 16 ounces of cannabis-infused solid product, 72 ounces of cannabis-infused liquid, and 7 grams of concentrate under RCW 69.50.360 and RCW 69.50.4013.

SB 5367 (2023), signed by Governor Inslee on May 9, 2023 and effective July 23, 2023, reshaped how Washington treats intoxicating hemp. The bill amended the RCW 69.50 definition of "cannabis product" to include any product with detectable THC, and it removed the prior delta-9-only language from "THC concentration." That single drafting change pulled high-THCA flower, hemp-derived delta-9 edibles, and converted cannabinoids into the licensed cannabis channel.

What Washington Law Actually Says

Under SB 5367, "THC concentration" is measured across delta-9, delta-8, delta-10, THCA, and other tetrahydrocannabinols rather than delta-9 alone. THCA flower routinely tests above 0.3 percent total THC once the post-decarboxylation conversion is applied (the standard conversion factor is 0.877). Flower that exceeds 0.3 percent total THC is a cannabis product under Washington law and may only be sold by a WSLCB-licensed cannabis retailer to adults 21 and over.

WSDA still licenses hemp cultivation under RCW Chapter 15.140, and hemp at the field stage must remain at or below 0.3 percent delta-9 THC on a dry-weight basis. The federal delta-9-only field test is what WSDA uses for compliance sampling. The state-level retail test under SB 5367, however, is a total-THC test, so a field-compliant THCA crop can become a cannabis product the moment it is processed into smokable form.

WSLCB licensed cannabis retailers may stock high-THC flower regardless of cannabinoid profile, including THCA-dominant cultivars. Products must be tracked in WSLCB's traceability system and labeled with the post-decarboxylation total THC figure. Unlicensed hemp retailers may not stock THCA flower for smokable sale.

How Enforcement Has Played Out

WSLCB has run enforcement sweeps against unlicensed retailers selling intoxicating hemp products since SB 5367 took effect. The agency posts enforcement bulletins through its rulemaking page and coordinates with local code enforcement on inspections. Convenience stores, smoke shops, and CBD shops have been the primary targets. Unlicensed retail sale of any product with detectable THC, including THCA flower, exposes the seller to controlled-substance penalties under RCW 69.50 and civil enforcement action.

What This Means for Retailers Selling THCA in Washington

• Hold an active WSLCB cannabis retailer license if you stock THCA flower or any smokable hemp that exceeds 0.3 percent total THC after decarboxylation. Hemp registration alone is not enough.
• COAs must show post-decarboxylation total THC, not just delta-9. The federal Farm Bill delta-9-only number is not what WSLCB measures at retail.
• Verify age 21 at point of sale. Track product through WSLCB traceability.
• Pull unlicensed THCA flower SKUs. SB 5367 does not include a phase-in or grandfather clause for previously stocked product.
• Watch the federal hemp redefinition. H.R. 5371 §781 takes effect November 12, 2026 and applies the same total-THC math as Washington at the federal level.

What This Means for Consumers Buying THCA in Washington

You can buy THCA flower from a WSLCB-licensed cannabis retailer if you are 21 or older. Smokable THCA flower at gas stations, smoke shops, and unlicensed CBD shops is not permitted under SB 5367 because the post-decarboxylation total THC reading exceeds the 0.3 percent hemp ceiling. Out-of-state online retailers that ship THCA flower to Washington addresses are exposing the buyer and themselves to enforcement, and that risk increases after the federal H.R. 5371 effective date. THCA shows up on every standard drug test once heated because it converts to delta-9 THC.

Pending Legislation to Watch

The federal hemp redefinition in H.R. 5371 §781, signed November 12, 2025 and effective November 12, 2026, replaces the 2018 Farm Bill's delta-9-only standard with post-decarboxylation total-THC testing and caps finished hemp products at 0.4 mg total THC per container. The federal language closely tracks Washington's SB 5367 approach. For the legislative backstory see our potential revisions to the 2018 Farm Bill explainer. For Washington-specific implementation see our Washington after SB 5367 guide.

Frequently Asked Questions

Is THCA flower legal in Washington in 2026? Restricted. SB 5367 (2023) classifies products with any detectable THC as cannabis products subject to WSLCB licensing. Smokable THCA flower may only be sold by licensed cannabis retailers to adults 21 or older.

Why does THCA count as THC under Washington law? SB 5367 amended the RCW 69.50 definition of "THC concentration" to include any tetrahydrocannabinol. When heated, THCA converts to delta-9 THC, and the post-decarboxylation total-THC test captures that conversion.

Can I buy THCA flower at a Washington smoke shop? No. Unlicensed retail sale of any product with detectable THC is prohibited under SB 5367. THCA flower routinely exceeds the 0.3 percent total-THC ceiling once decarboxylated.

Does THCA show up on a drug test? Yes. Once heated, THCA converts to delta-9 THC and produces the same metabolites tested by standard urine, saliva, and hair screens.

Can I order THCA flower online and have it shipped to Washington? Out-of-state shipments of smokable THCA flower into Washington violate SB 5367 because the finished product is a cannabis product under state law and is not licensed for sale by a WSLCB retailer.

What changes for Washington hemp on November 12, 2026? The federal hemp redefinition aligns federal law with Washington's total-THC approach and caps lawful hemp at 0.4 mg total THC per container, ending most federal Farm Bill defenses for THCA flower sold across state lines.

How does Washington compare to other states on THCA? Washington's SB 5367 total-THC standard is one of the strictest in the country. See our 2025 hemp regulation roundup for state-by-state comparisons.

This page is provided for informational purposes by ComplyAssistAI LLC and is not legal advice. Hemp and cannabis law in Washington changes frequently. For business compliance questions, consult a Washington-licensed cannabis attorney. Find one in our Cannabis Lawyer Directory.