Washington planting calendar

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

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

Sage planting timetable for Washington

Stage	When in Washington	Anchor
Start seeds indoors	early March (March 4)	6 weeks before the last frost (mid-April (Puget Sound))
Transplant outside	mid-April (April 15)	0 days after the last frost (mid-April (Puget Sound))
First harvest (estimate)	late June (June 29)	~75 days from transplant

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 sage dates

Washington's last spring frost averages mid-April (Puget Sound) and first fall frost early November (Puget Sound), which sets the whole planting clock. 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. Wait for warm soil — sage stall in cold ground even after the air warms, so don't rush them out.

Sow indoors 6–8 weeks before the average last frost date, barely covering seeds with vermiculite; germination takes 7–14 days at 21–24 °C (70–75 °F), then grow on at 15–18 °C (60–65 °F). Transplant outside on or around the last frost date — common sage (Salvia officinalis) is hardy in zones 4a–10b, though ornamental cultivars ('Tricolor', 'Aurea', 'Purpurea') are only reliably hardy from zone 6 upward. Plants may not flower in their first year from seed; restrict heavy harvests the first season to allow root establishment.

Frost-risk note

Don't plant before mid-April (Puget Sound) — a hard freeze can still set young plants back. In the Cascades and northeast highlands (zone 4a) the safe date runs a week or two later.

Regional variation within Washington

the Cascades and northeast highlands (zone 4a) runs roughly 1-2 weeks behind the state average; the Puget Sound lowland around Seattle (zone 9a) can plant 1-2 weeks earlier.

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

Pair the post-frost slot with other warm-season crops — peppers, beans, squash, and cucumbers.

Quick-grow guide

Sun: Full sun — 6+ hours direct.
Soil temperature for germination: 21–24 °C (70–75 °F).
Spacing: 18–24 inches (45–60 cm) between plants.
Days to harvest: ~75 days from planting out.

Frequently asked questions

When is the best time to plant sage in Washington?

In Washington (mostly USDA zone 8a), sow sage indoors around early March, transplant outdoors mid-April (after the last frost, mid-April), and harvest from late June. Sage are cold-hardy — they tolerate frost and actively prefer cool weather, so they go in well before the last spring frost and bolt in summer heat.

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 sage in Washington?

Yes. Washington's dominant zone 8a supports sage — the key is timing. Sage are cold-hardy — they tolerate frost and actively prefer cool weather, so they go in well before the last spring frost and bolt in summer heat.

Does the planting date change across Washington?

the Cascades and northeast highlands (zone 4a) runs roughly 1-2 weeks behind the state average; the Puget Sound lowland around Seattle (zone 9a) can plant 1-2 weeks earlier.

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

Pair the post-frost slot with other warm-season crops — peppers, beans, squash, and cucumbers.

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.