When to plant kohlrabi in New York, New York
March 2 – March 16
Transplant outdoors · typical New York yearClimate basis: NOAA station New York Cntrl Pk Twr, NY (USW00094728), 5 mi (8 km) from downtown New York (ZCTA 10007 centroid), elevation 130 ft, on the 1991–2020 climate normals. Transplant kohlrabi outdoors from approximately the dates above, anchored to the median last spring 32°F freeze (March 30). One year in ten still freezes after April 9.
The New York year
- indoors under lights
- in the garden
- frost-free season
- 1-in-10 years still freeze to Apr 9
Every method, with its sources
Start seeds indoors
Jan 19 – Feb 2Sow 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 (Mar 30). University of New Hampshire Extension
Transplant outdoors
Mar 2 – Mar 16UNH: 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 (Mar 30). University of New Hampshire Extension · Purdue University Extension
Fall planting
Sep 25 – Oct 23Purdue Table 2: plant fall kohlrabi at least 4–8 weeks before the first fall frost. Anchored to the median first fall freeze (Nov 20). 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.
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.