PlantingWindowThe American Planting Almanac

When to plant mustard greens in Omaha, Nebraska

March 21 – April 4

Direct-sow outdoors · typical Omaha year

Climate basis: NOAA station Omaha Eppley Airfield, NE (USW00014942), 4 mi (6 km) from downtown Omaha (ZCTA 68102 centroid), elevation 982 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 18). One year in ten still freezes after April 30.

Last spring freezeApril 181-in-10 after Apr 30
First fall freezeOctober 211-in-10 before Oct 6
Frost-free season≈ 185 daysmedian at 32°F
Hard freeze, 28°Apr 8 – Oct 30kills even hardy greens
USDA zone6a-10 to -5°F winter low — not frost timing

The Omaha year

Direct-sow outdoorsMar 21 – Apr 4
Fall plantingAug 26 – Sep 23
  • indoors under lights
  • in the garden
  • frost-free season
  • 1-in-10 years still freeze to Apr 30
Mustard greens in Omaha · freeze context from Omaha Eppley Airfield, NE, 1991–2020 normals.

Every method, with its sources

Direct-sow outdoors

Mar 21 – Apr 4

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 18). Purdue University Extension

Fall planting

Aug 26 – Sep 23

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 21). 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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