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Also known as: Washington cannabis possession laws · Washington marijuana possession limits

Cannabis Possession Limits in Washington

Adult possession caps, where you can use it, and why home growing remains illegal.

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This article is general information, not legal advice. Laws change; check current rules with official sources or a lawyer.

↯ The honest take

Washington lets adults buy and carry a reasonable amount of cannabis, but it's stricter than most legal states in two ways: no home growing allowed (even for recreation), and no legal gifting carve-out. The possession limits are what you can buy per transaction and what you can hold at once—they don't stack. Public consumption and driving under the influence carry real penalties.

Adult possession limits

Adults 21 and older in Washington may legally possess the following amounts of cannabis purchased from a licensed retailer, for personal use [1] Strong evidence:

These are separate categories—you could legally hold the maximum of each at the same time, though carrying near-maximum amounts may attract law enforcement attention.

Possession above these amounts is a criminal offense. More than 40 grams of usable cannabis is a Class C felony under RCW 69.50.4013 [2] Strong evidence. Amounts between the legal limit and 40 grams are a misdemeanor.

Where you can and cannot use it

Legal possession does not permit use anywhere. Washington law prohibits public consumption of cannabis. Under RCW 69.50.445, opening a package of cannabis or consuming it in view of the general public is a civil infraction [3] Strong evidence.

Other location restrictions:

Federal land: National parks, national forests, military bases, and federal buildings remain under federal law, where cannabis is a Schedule I controlled substance [4] Strong evidence.

Vehicles: Driving under the influence is illegal. Washington has a per se THC limit of 5 nanograms per milliliter of active THC in blood (RCW 46.61.502) [5] Strong evidence. Cannabis in a vehicle must be in a sealed container, similar to alcohol rules. See Cannabis Driving Impairment Laws in Washington for more detail.

Crossing state lines: Illegal under federal law, even into other legal states.

Workplaces and rentals: Employers and landlords can prohibit possession or use on their premises.

Home cultivation: prohibited for adults

Recreational home cultivation is not permitted in Washington. It is the only legal-use state on the West Coast that bans non-medical home growing [6] Strong evidence.

Growing any amount of cannabis without a license or medical authorization is a felony under RCW 69.50.401.

Medical patients: Those registered in the Department of Health's medical cannabis authorization database may grow up to 6 plants and possess up to 8 ounces of usable cannabis from those plants. A healthcare practitioner may authorize up to 15 plants and 16 ounces if medically necessary (RCW 69.51A.210) [7] Strong evidence. Up to four registered patients living together can form a cooperative to grow jointly, subject to registration and location restrictions.

Recreational home-grow legalization bills have failed in the legislature as of this date.

Purchase limits vs. possession limits

The possession limits are also the per-transaction purchase limits at licensed retailers under WAC 314-55-079 [8] Strong evidence. A retailer will decline to sell you more than 1 ounce of flower (or the equivalent in other product categories) in a single transaction.

Washington does not maintain a consumer-facing database of cumulative purchases across retailers. However, the legal possession cap does not increase based on purchase frequency. If you purchase an ounce of flower at two different stores on the same day, you exceed the possession limit as soon as you have both in your possession, regardless of where you bought them.

Gifting, sharing, and selling

Washington law does not contain an explicit personal gifting exception. Any transfer of cannabis outside a licensed retailer is technically a "delivery," and unlicensed delivery is a criminal offense under RCW 69.50.401 [2] Strong evidence. In practice, small transfers between adults are rarely prosecuted, but the statute makes no legal distinction between selling and giving away.

"Gifting" business models—in which a customer purchases an item (such as a sticker or art) and receives cannabis as a purported gift—appeared in Washington, D.C., and New York but are illegal in Washington Weak / limited. The Washington State Liquor and Cannabis Board has taken enforcement action against these models, though specific cases and outcomes are not extensively documented in public records.

Recent legislative and federal developments

2022 SB 5796: Modified Washington's drug possession law framework following the State v. Blake court decision, but did not alter cannabis-specific possession limits.

2022 HB 1859: Changed references to "marijuana" to "cannabis" throughout state law, a naming update with no substantive effect on limits [9] Strong evidence.

2023–2024: Multiple bills to legalize recreational home cultivation failed in committee.

Federal level: In 2024, the DEA announced an intention to move marijuana from Schedule I to Schedule III classification [10] Strong evidence. This federal rescheduling, if finalized, would not directly change Washington state possession limits but could affect federal penalties and research access.

Statutes and enforcement priorities change. Verify current limits with the Washington State Liquor and Cannabis Board before relying on this article.

This article is informational only and does not constitute legal advice. Cannabis remains illegal under U.S. federal law regardless of state legalization. Laws, regulations, and enforcement priorities change. If you face a criminal charge, employment dispute, housing issue, or immigration/border question involving cannabis, consult a licensed Washington attorney.

Information last verified: November 2026. Statutes and regulations cited are current as of that date. Always check the current text of the Revised Code of Washington (RCW) and Washington Administrative Code (WAC) at the Washington State Legislature website.

Sources

  1. Government Revised Code of Washington § 69.50.360 — Marijuana retailer's license — Sales of usable marijuana and marijuana-infused products.
  2. Government Revised Code of Washington § 69.50.4013 — Possession of controlled substance — Penalty.
  3. Government Revised Code of Washington § 69.50.445 — Opening package of or consuming marijuana in view of general public — Penalty.
  4. Government U.S. Drug Enforcement Administration — Drug Scheduling: Marijuana listed as Schedule I under the Controlled Substances Act.
  5. Government Revised Code of Washington § 46.61.502 — Driving under the influence.
  6. Reported Young, B. (2023). 'Washington remains only West Coast state banning marijuana home grows.' The Seattle Times.
  7. Government Revised Code of Washington § 69.51A.210 — Qualifying patients and designated providers — Possession and cultivation limits.
  8. Government Washington Administrative Code § 314-55-079 — Marijuana retailer license.
  9. Government Washington State Legislature (2022). HB 1859 — Amending references to marijuana throughout the Revised Code of Washington.
  10. Reported Lovelace, B. Jr. (2024). 'DEA moves to reclassify marijuana as a lower-risk drug.' NBC News.

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