Quick Snapshot
Cannabis seeds are legal to buy in Washington for adults 21 and over, and Seeds Here Now ships discreetly to every ZIP code in the state. Recreational and medical cannabis are both legal in Washington, but home cultivation is limited to registered medical patients — up to six plants (15 with special authorization) — so for recreational adults, seeds remain collection items.
Washington was one of the first two states (with Colorado) to legalize recreational cannabis, with adult-use sales beginning July 2014. Cannabis is fully legal for recreational and medical use for adults 21 and over, with possession capped at 1 ounce of flower in public. However, Washington remains one of the few recreational-legal states that prohibits home cultivation for recreational users — only registered medical patients can grow at home (up to 6 plants, more with special authorization).
Washington has world-class outdoor cannabis terroir — particularly east of the Cascades — and a deep cultivation culture among the medical patient population.
Legal Status of Cannabis Seeds and Cultivation in Washington
WA voters approved Initiative 502 in November 2012, with retail sales beginning July 2014. The framework is codified in RCW Chapter 69.50 (Uniform Controlled Substances Act, with cannabis-specific provisions).
Possession Limits (Adults 21+)
- Flower: 1 ounce in public
- Concentrate: 7 grams
- Edibles: 16 ounces (solid) / 72 ounces (liquid)
Home Cultivation — The WA Outlier
Home cultivation is illegal for recreational users in Washington. Only registered medical cannabis patients (or designated providers) can legally grow at home:
- 6 plants for most patients
- Up to 15 plants with high-need authorization
- 24+ plants for designated providers serving multiple patients
This makes WA one of three major recreational-legal states (with NJ and DE) that prohibit home grow for recreational users. Bills to add recreational home cultivation have been introduced repeatedly but have not passed.
Medical Cannabis
WA’s medical program (running parallel to recreational) provides higher possession limits, lower taxes, and home cultivation rights for registered patients.
Cannabis Seeds
Cannabis seeds containing no THC are sold under the federal 2018 Farm Bill framework. WA adults 21+ can legally receive seed shipments. For non-medical adults, the seeds remain in collection/novelty status (germinating is illegal). For medical patients, seeds can be used for legal home cultivation.
USDA Plant Hardiness Zones in Washington
WA’s geography produces dramatic climate variation, divided by the Cascade Range. The state covers USDA zones 4a through 9a on the 2023 map.
| Region | USDA Zone | Major Cities |
|---|---|---|
| Pacific Coast | 8b–9a | Aberdeen, Long Beach |
| Puget Sound | 8b–9a | Seattle, Tacoma, Bellingham, Everett |
| Western Cascades | 6a–8a | Snohomish, North Bend |
| Cascade peaks | 4a–6a | Mt. Rainier, Stevens Pass area |
| Columbia Basin | 6b–7b | Yakima, Tri-Cities, Walla Walla |
| Eastern Washington | 5b–7b | Spokane, Pullman, Wenatchee |
| Northeast WA | 5a–6b | Colville, Republic |
Growing season ranges from 100 days at higher elevations to 270+ days on the Pacific coast.
Washington Outdoor Cannabis Grow Calendar
Outdoor cultivation is illegal in Washington for recreational users. This section applies to medical patients with cultivation rights and is informational for future legalization considerations.
Frost Dates
| Location | Last Spring Frost | First Fall Frost | Frost-Free Days |
|---|---|---|---|
| Seattle | March 25–April 5 | November 10–20 | ~225 |
| Tacoma | April 1–10 | November 5–15 | ~215 |
| Spokane | May 1–10 | October 5–15 | ~155 |
| Yakima | April 25–May 5 | October 8–18 | ~165 |
| Walla Walla | April 20–30 | October 12–22 | ~175 |
| Bellingham | April 5–15 | October 30–November 10 | ~205 |
Western WA Schedule (West of Cascades)
Mild humid climate, heavy rainfall, mold pressure is the big challenge:
- Late March-April: Germinate indoors
- Mother’s Day (May): Transplant outdoors
- June-August: Vegetative growth
- September-October: Flower (mold watch)
- Mid-October: Target harvest before heavy fall rains
Eastern WA Schedule (East of Cascades)
Dry continental climate, more like Oregon’s high desert:
- Mid-April to May: Germinate indoors
- Memorial Day: Transplant outdoors
- June-September: Veg and flower
- Early to mid-October: Harvest
Eastern WA (especially the Columbia Basin around Yakima and Walla Walla) is one of the premier outdoor cannabis regions in the country — long sunny days, low humidity, cool nights, and abundant irrigation water.
Best Cannabis Strains for Washington
WA’s climate diversity supports a wide strain catalog, with selection driven by region.
Western WA (Puget Sound, Coast)
Mild damp climate calls for mold resistance:
Blue Dream
Pacific NW favorite, mold-resistant.
Durban Poison
strong mold resistance.
Frisian Dew
bred for damp climates, develops purple.
Critical Mass
handles humidity.
Pineapple Express
PNW staple.
Eastern WA (Columbia Basin, Spokane)
Dry, sunny climate supports almost any strain:
Gorilla Glue #4
thrives in eastern WA’s long warm days.
Sour Diesel
finishes easily.
OG Kush
handles eastern WA climate.
Hindu Kush
landrace, handles continental climate.
Northeast WA and Higher Elevations
Shorter cooler seasons:
Northern Lights
fast flowering, cold-tolerant.
Autoflowers
for high-elevation locations.
Indoor
WA has reasonable electricity costs (hydropower keeps rates moderate) and a mature indoor cultivation industry. The full strain catalog applies.
Local Considerations
Climate split: Western WA and Eastern WA are essentially different cultivation climates. Strain selection must match.
Humidity: Western WA fall humidity drives mold pressure. Eastern WA stays drier.
Soil: Western WA has acidic forest soils; Eastern WA has alkaline irrigation-amended soils. Test and amend.
Pests: Spider mites (statewide), aphids, slugs (western), powdery mildew (humid areas).
Light pollution: Cities have light pollution that can confuse photoperiod plants.
Wildlife: Deer pressure significant, bears in forested areas.
Where to Buy Cannabis Seeds in Washington
Seeds Here Now ships to every WA ZIP code — Seattle, Spokane, Tacoma, Bellingham, Yakima, every Evergreen State town. Discreet plain packaging, 2-3 day transit.
Washington has a mature cannabis industry with many local seed sources. Our advantage is selection — 4,000+ strains from 100+ breeders, including genetics not available regionally.
For WA customers:
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Ready to browse? Start with our feminized cannabis seeds for photoperiod runs, autoflower seeds for speed and reliability, or regular cannabis seeds if you’re hunting phenos or making crosses — every pack ships to Washington backed by our No-Catch Replacement Guarantee.
Cannabis Seeds in Nearby States
Climate and law change fast at state lines. If you’re close to a border — or just curious how your neighbors have it — these guides cover the same ground:
Frequently Asked Questions
Is cannabis legal in Washington?
Yes. Recreational and medical cannabis are both legal for adults 21 and over. WA was one of the first states to legalize recreational cannabis.
Can I grow cannabis at home in Washington?
Only as a registered medical cannabis patient. Recreational users cannot legally grow at home in WA — one of the few states with this restriction.
How many plants can a medical patient grow in WA?
6 plants for most patients; up to 15 with high-need authorization; more for designated providers serving multiple patients.
How much cannabis can I possess in Washington?
1 ounce of flower, 7 grams of concentrate, 16 oz of solid edibles, 72 oz of liquid edibles.
Is it legal to buy cannabis seeds in Washington?
Yes. WA adults 21+ can legally receive cannabis seed shipments. Medical patients can use them for legal cultivation; for recreational users, seeds remain in collection/novelty status.
What USDA hardiness zone is Washington in?
WA spans USDA zones 4a through 9a. Seattle is 8b-9a. Spokane is 6b-7a. Yakima is 6b-7a. Cascade peaks reach zone 4a.
Sources
- RCW Chapter 69.50 (Washington Uniform Controlled Substances Act)
- Washington State Liquor and Cannabis Board
- USDA Plant Hardiness Zone Map, 2023
- Western Regional Climate Center
Last updated: July 2026.
Find Cannabis Seeds in Nearby States
Growing near Washington? See how seed laws and growing conditions compare in Oregon, Idaho, and Montana, or browse every state from the USA cannabis seeds hub.