PlantingWindowThe American Planting Almanac

When to plant mustard greens in Oklahoma City, Oklahoma

March 7 – March 21

Direct-sow outdoors · typical Oklahoma City year

Climate basis: NOAA station Oklahoma City Will Rogers AP, OK (USW00013967), 7 mi (12 km) from downtown Oklahoma City (ZCTA 73102 centroid), elevation 1285 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 4). One year in ten still freezes after April 20.

Last spring freezeApril 41-in-10 after Apr 20
First fall freezeNovember 21-in-10 before Oct 21
Frost-free season≈ 213 daysmedian at 32°F
Hard freeze, 28°Mar 21 – Nov 11kills even hardy greens
USDA zone7b5 to 10°F winter low — not frost timing

The Oklahoma City year

Direct-sow outdoorsMar 7 – Mar 21
Fall plantingSep 7 – Oct 5
  • indoors under lights
  • in the garden
  • frost-free season
  • 1-in-10 years still freeze to Apr 20
Mustard greens in Oklahoma City · freeze context from Oklahoma City Will Rogers AP, OK, 1991–2020 normals.

Every method, with its sources

Direct-sow outdoors

Mar 7 – Mar 21

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 4). Purdue University Extension

Fall planting

Sep 7 – Oct 5

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