US State

Cannabis and hemp laws

Washington

Recreational and medical marijuana legal; THCA and hemp delta-9 restricted; delta-8, delta-10 and HHC illegal

Adult use
Legal
Medical
Legal
Last reviewed
May 27, 2026

Washington

Cannabinoid status board

All states and compounds

Delta-10 THC

Illegal

Limits

Chemically synthesized delta-10 THC is treated as a Schedule I controlled substance under RCW 69.50.204. WSLCB-licensed cannabis licensees may not manufacture, purchase, or sell hemp-derived delta-10.

Key law

Washington SB 5367 (2023); WSLCB Policy Statement #PS21-01 (2021); RCW Chapter 69.50; RCW 69.50.204

Effective

July 23, 2023

Full rules

Delta-8 THC

Illegal

Limits

Chemically converted delta-8 THC from CBD is a Schedule I controlled substance under RCW 69.50.204. WSLCB-licensed cannabis processors and retailers are barred from manufacturing, purchasing, or selling hemp-derived delta-8.

Key law

Washington SB 5367 (2023); WSLCB Bulletin 21-03; Policy Statement #PS21-01 (2021); RCW Chapter 69.50; RCW 69.50.204

Effective

July 23, 2023

Full rules

Delta-9 THC

Restricted

Limits

Any product with detectable THC, including hemp-derived delta-9 edibles and beverages, is a cannabis product and may only be sold by WSLCB-licensed cannabis retailers to adults 21+. Adult-use limits: 1 oz useable cannabis, 16 oz solid infused, 72 oz liquid infused, 7 g concentrate.

Key law

Washington SB 5367 (2023); RCW Chapter 69.50; RCW Chapter 15.140; Initiative 502 (2012); WSLCB rules

Effective

July 23, 2023

Full rules

HHC

Illegal

Limits

Hexahydrocannabinol (HHC) is produced by hydrogenation of hemp-derived cannabinoids and is treated as a synthetic/chemically converted cannabinoid. WSLCB prohibits HHC at all retail tiers; licensed processors may not manufacture it and retailers may not sell it.

Key law

Washington SB 5367 (2023); WSLCB Policy Statement #PS21-01 (2021); RCW Chapter 69.50; RCW 69.50.204

Effective

July 23, 2023

Full rules

THCA

Restricted

Limits

Smokable hemp containing THCA that exceeds 0.3 percent total THC post-decarboxylation is treated as cannabis and is restricted to WSLCB-licensed retailers. Adult-use limits: 1 oz useable cannabis, 16 oz solid infused, 72 oz liquid infused, 7 g concentrate for adults 21+.

Key law

Washington SB 5367 (2023); RCW Chapter 69.50; RCW Chapter 15.140; WSLCB intoxicating-cannabinoid rules; Initiative 502 (2012)

Effective

July 23, 2023

Full rules

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Washington

Latest news and analysis

All news

May 28, 2026

TSA Medical Marijuana by State: Where Patients Actually Get Arrested at the Airport in 2026

The variable that matters in 2026 is not the TSA page. It is the airport you land at. A 28-airport breakdown of permissive, discretionary, and prohibitionist enforcement, with the source-state and destination-state details patients actually need.

Can You Fly With Medical Marijuana in 2026? A Patient Travel Guide

TSA's April 27, 2026 page update changed the federal picture for state-licensed medical patients. The practical picture changed less than the headlines suggest. A patient travel guide for 2026, by documentation, by airport, by scenario.

Can You Bring Edibles on a Plane in 2026? TSA Rules for THC, Hemp and CBD Gummies

TSA does not search for edibles, but it refers illegal ones to law enforcement. The product, the arrival state and the Dec 11 federal hemp date decide the rest.

Multi-State Hemp Policy Tracker Spring 2026: GA, IN, KY, MN, MO, VA, and WA Legislative Activity

Spring 2026 hemp legislation in Georgia, Indiana, Kentucky, Minnesota, Missouri, Virginia, and Washington is creating a fragmented multi-state compliance map.

COA Fraud Is Spiking in 2025: Digital Signatures, Raw Data Links, and Retailer Audit Playbooks That Actually Work

COA fraud in 2025 ranges from edited PDFs to mismatched lot IDs and Franken-COAs, pushing retailers toward digital signatures, raw data links, and audits.

Washington's My Health My Data Act Meets Cannabis: Geofencing, Retargeting, and 'Consumer Health Data' Risks in 2025

Washington's My Health My Data Act limits geofencing, retargeting, and health-data uses in cannabis marketing, with private suits raising 2025 risk.

FAQ

Common questions

Is marijuana legal in Washington?

Recreational marijuana is legal in Washington. Medical marijuana is legal.

Is THCA legal in Washington?

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.

Is delta-8 THC legal in Washington?

No. Washington does not permit hemp-derived delta-8 THC at general retail, and licensed cannabis retailers are barred from stocking it as well.

Is hemp-derived delta-9 THC legal in Washington?

Restricted. Hemp-derived delta-9 THC edibles, beverages, and tinctures are treated as cannabis products under Washington law and may only be sold by WSLCB-licensed cannabis retailers to adults 21 and over.

This is general information, not legal advice.

Seed Legality

Adult-use state but non-medical home grow is still a felony (SB 6204 died in 2026); seeds limited to licensees/patients.
Hemp seeds
Restricted
Marijuana seeds
Restricted
Sale
Restricted
Transacting
Restricted
Gifting
Illegal

Washington legalized adult use in 2012 but still bans recreational home cultivation — growing remains a class C felony, and 2026's SB 6204 (six plants per adult, 15 per household) was shelved in Senate Rules before the February 2026 cutoff. Seeds circulate only inside the licensed system: RCW 69.51A.250 lets registered medical patients and cooperatives purchase plants and seeds from licensed producers and grow at home (4–15 plants depending on authorization), while recreational consumers' possession allowances under RCW 69.50.360 do not include seeds, so buying or gifting viable seeds outside these channels is unlawful. Hemp cultivation requires a WSDA license under RCW ch. 15.140.

Key law:
RCW 69.50.360, 69.50.4013; RCW 69.51A.250; RCW ch. 15.140
Last reviewed:
July 3, 2026
This section is provided for informational purposes only and is not legal advice. Seed laws change frequently — verify current law with qualified counsel before making decisions.
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