PlantingWindowThe American Planting Almanac

When to plant mustard greens in Spokane, Washington

March 29 – April 12

Direct-sow outdoors · typical Spokane year

Climate basis: NOAA station Spokane INTL AP, WA (USW00024157), 5 mi (8 km) from downtown Spokane (ZCTA 99201 centroid), elevation 2353 ft, on the 1991–2020 climate normals. Direct-sow mustard greens from approximately the dates above, anchored to the median last spring 32°F freeze (April 26). One year in ten still freezes after May 10.

Last spring freezeApril 261-in-10 after May 10
First fall freezeOctober 121-in-10 before Sep 29
Frost-free season≈ 168 daysmedian at 32°F
Hard freeze, 28°Apr 6 – Oct 23kills even hardy greens
USDA zone7a0 to 5°F winter low — not frost timing

The Spokane year

Direct-sow outdoorsMar 29 – Apr 12
Fall plantingAug 17 – Sep 14
  • indoors under lights
  • in the garden
  • frost-free season
  • 1-in-10 years still freeze to May 10
Mustard greens in Spokane · freeze context from Spokane INTL AP, WA, 1991–2020 normals.

Every method, with its sources

Direct-sow outdoors

Mar 29 – Apr 12

Purdue lists mustard under both hardy (4–6 weeks before the last frost) and semi-hardy (2–4 weeks before); the later semi-hardy start is used. Anchored to the median last spring freeze (Apr 26). Purdue University Extension

Fall planting

Aug 17 – Sep 14

Purdue Table 2: plant fall mustard greens at least 4–8 weeks before the first fall frost. Anchored to the median first fall freeze (Oct 12). Purdue University Extension

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 (1)

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