When to plant kohlrabi in Omaha, Nebraska

March 21 – April 4

Transplant 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. Transplant kohlrabi outdoors 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

Start seeds indoorsFeb 7 – Feb 21

Transplant 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

Kohlrabi in Omaha · freeze context from Omaha Eppley Airfield, NE, 1991–2020 normals.

Every method, with its sources

Start seeds indoors

Feb 7 – Feb 21

Sow 4–6 weeks before the set-out window opens (UNH: time from seed to transplant 4–6 weeks). Anchored to the median last spring freeze (Apr 18). University of New Hampshire Extension

Transplant outdoors

Mar 21 – Apr 4

UNH: safe to set out 4 weeks before the last frost; Purdue's hardy class allows 4–6 weeks before. The later UNH start is used. Anchored to the median last spring freeze (Apr 18). University of New Hampshire Extension · Purdue University Extension

Fall planting

Aug 26 – Sep 23

Purdue Table 2: plant fall kohlrabi 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 (2)

University of New Hampshire Extension: Growing Vegetables: When to Plant Your Vegetable Garden [fact sheet] (accessed 2026-07-24)
Per-crop 'time from seed to transplant' and 'safe to set out in garden' relative to last frost.
Purdue University Extension: Indiana Vegetable Planting Calendar (HO-186-W) (accessed 2026-07-24)
Hardiness classes: hardy = plant 4-6 wk before last spring frost; semi-hardy = 2-4 wk before; tender = after average last frost; very tender = at least 2 wk after. Table 2: fall planting at least 4-8 wk before first fall frost.

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