Is Recreational Marijuana Legal in Washington? (2026)

Washington's Initiative 502 was one of the first two legalization measures in the country (alongside Colorado's Amendment 64). What the law actually does: adults 21+ may possess up to 1 oz of flower, 7 grams of concentrate, or 16 oz of edibles, and purchase from licensed retailers. Home growing is NOT allowed for recreational users. What people misunderstand: Washington's no-home-grow rule is the most significant restriction in any legal state. Another common confusion: Washington's 5 ng/mL THC blood limit for DUI is a per se standard — if you're above it, you're presumed impaired regardless of actual impairment. This catches regular users who may have elevated baseline THC levels. The practical reality is that Washington's market is mature, well-regulated, and competitive, but the home grow prohibition remains a point of contention.

Enforcement in Washington is minimal for personal possession. The most common scenario is DUI — Washington has a 5 ng/mL THC blood limit. Another scenario: crossing into Idaho with Washington-purchased marijuana. Idaho State Police are extremely aggressive at the border, particularly on I-90. A third scenario: consuming in national parks. Washington has several major national parks, and park rangers enforce federal law. A practical scenario: Washington's prohibition on recreational home growing frustrates many consumers who feel it's inconsistent with legalization. Multiple legislative attempts to add home growing have failed.