When to plant sage in Seattle, Washington

March 13 – March 27

Transplant outdoors · typical Seattle year

Climate basis: NOAA station Seattle Boeing Fld, WA (USW00024234), 5 mi (8 km) from downtown Seattle (ZCTA 98104 centroid), elevation 20 ft, on the 1991–2020 climate normals. Transplant sage outdoors from approximately the dates above, anchored to the median last spring 32°F freeze (March 13). One year in ten still freezes after April 1.

Last spring freezeMarch 131-in-10 after Apr 1

First fall freezeNovember 171-in-10 before Nov 1

Frost-free season≈ 247 daysmedian at 32°F

Hard freeze, 28°Feb 18 – Dec 2kills even hardy greens

USDA zone9a20 to 25°F winter low — not frost timing

The Seattle year

Start seeds indoorsJan 16 – Jan 30

Transplant outdoorsMar 13 – Mar 27

Direct-sow outdoorsMar 13 – Mar 27

indoors under lights
in the garden
frost-free season
1-in-10 years still freeze to Apr 1

Sage in Seattle · freeze context from Seattle Boeing Fld, WA, 1991–2020 normals.

Every method, with its sources

Start seeds indoors

Jan 16 – Jan 30

Wisconsin Horticulture says to start sage indoors 6 to 8 weeks before the average date of last frost, so sowing runs 8 to 6 weeks before the last spring freeze. Anchored to the median last spring freeze (Mar 13). University of Wisconsin-Madison Division of Extension, Wisconsin Horticulture · University of Maryland Extension

Transplant outdoors

Mar 13 – Mar 27

UMD Extension names sage among herbs started indoors and planted outside after the danger of frost has passed, which coincides with Wisconsin Horticulture's direct-sow date, so the window opens at the last spring freeze. Anchored to the median last spring freeze (Mar 13). University of Wisconsin-Madison Division of Extension, Wisconsin Horticulture · University of Maryland Extension

Direct-sow outdoors

Mar 13 – Mar 27

Wisconsin Horticulture gives a point rule — plant sage seed directly in the garden on the average date of last frost — which opens a two-week sowing span beginning at that date. Anchored to the median last spring freeze (Mar 13). University of Wisconsin-Madison Division of Extension, Wisconsin Horticulture · University of Maryland Extension

Variety assumption: Wisconsin Horticulture notes seed-grown sage may not flower the first year; culinary leaf harvest is unaffected.

These windows describe typical years (1991–2020 climate normals), not this year's forecast. Freezes happen outside them — especially in frost pockets, valleys, and urban edges. Watch the forecast before committing tender plants.

This week, not a typical year:

Crop rule sources (2)

University of Wisconsin-Madison Division of Extension, Wisconsin Horticulture: Sage, Salvia officinalis (accessed 2026-07-25)
"To grow from seed, either plant directly in the garden on the average date of last frost or start indoors 6 to 8 weeks before then."
University of Maryland Extension: Care of Herbs and Starting Herbs from Seed (accessed 2026-07-25)
"Basil, parsley, sage, marjoram, and many other herbs can be started indoors and planted outside after the danger of frost has passed."

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