Washington planting calendar

When to plant garlic in Washington — sow, transplant & harvest dates

Washington is mostly USDA zone 8a (range 4a-9a). Dates below are derived from garlic's frost tolerance and Washington's frost window — not generic national averages.

Garlic planting timetable for Washington

Stage	When in Washington	Anchor
Plant cloves outdoors	late September — mid-October (October 1)	~35 days before Washington's first fall frost (early November (Puget Sound))
First harvest	early June the following year	~240 days from autumn planting

Dates are state-wide averages for the dominant zone. Local microclimates — elevation, urban heat, coastal moderation — can shift the window by 1-2 weeks. Use the frost-date calculator for a date tuned to your town.

Why Washington's climate shifts the garlic dates

Washington's first fall frost averages early November (Puget Sound), which sets the autumn planting clock — cloves need 4-6 weeks of root growth before the ground freezes. Washington is split by the Cascades into a mild, wet, long-season west and a colder, drier east. The Puget Sound lowland is the mildest belt.

Garlic is the unusual one — plant cloves in autumn (4-6 weeks before the first hard fall frost) so they put down roots before winter, then break dormancy in spring and bulb up over the long days of early summer. Cold-winter zones grow hardneck varieties; mild-winter zones do better with softneck.

Frost-risk note

Get cloves in before the ground freezes solid; in the Cascades and northeast highlands (zone 4a) mulch heavily with 10-15 cm of straw to stop freeze-thaw heaving.

Regional variation within Washington

the Cascades and northeast highlands (zone 4a) should plant at the earlier end of the window and grow hardneck types; the Puget Sound lowland around Seattle (zone 9a) can plant later and lean on softneck varieties.

Seattle — USDA zone 9a
Spokane — USDA zone 7a
Tacoma — USDA zone 8b
Vancouver — USDA zone 8b
Yakima — USDA zone 7a

What else to plant in Washington around then

The same autumn slot suits overwintering onions, shallots, and a final sowing of spinach or mache.

Quick-grow guide

Sun: Full sun — 6+ hours direct.
Soil temperature for germination: Soil 10-15 °C (50-60 °F) at planting.
Spacing: 4-6 inches (10-15 cm) between plants.
Days to harvest: ~240 days from autumn planting.

Frequently asked questions

When is the best time to plant garlic in Washington?

In Washington (mostly USDA zone 8a), plant garlic cloves outdoors around late September — mid-October — roughly 35 days before the first fall frost (early November (Puget Sound)). Cloves root through autumn, overwinter, then bulb up by early June next year. Garlic is fall-planted — cloves need winter chilling, so they go in the ground in autumn, root before the freeze, and bulb up the following summer.

What USDA zone is Washington?

Most of Washington sits in USDA hardiness zone 8a, with the state spanning roughly 4a-9a from the Cascades and northeast highlands (zone 4a) to the Puget Sound lowland around Seattle (zone 9a). The last spring frost averages mid-April (Puget Sound) and the first fall frost early November (Puget Sound).

Can you grow garlic in Washington?

Yes. Washington's dominant zone 8a supports garlic — the key is timing. Garlic is fall-planted — cloves need winter chilling, so they go in the ground in autumn, root before the freeze, and bulb up the following summer.

Does the planting date change across Washington?

What else can I plant in Washington around the same time?

The same autumn slot suits overwintering onions, shallots, and a final sowing of spinach or mache.

Source and methodology

State zone spans from the USDA Plant Hardiness Zone Map (2023); frost-date averages from NOAA Climate Data Online. Hot-state two-season timing cross-checked against the UF/IFAS Florida Gardening Calendar and the University of Arizona Cooperative Extension planting calendar. Curated by the Growli editorial team.