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When to plant Kale

Computed from land-grant Extension planting-window rules (cited below), localized to real ZIP-level median frost dates, not a single national guess. These are national-generic rules by hardiness class; individual state Extension offices layer their own regional adjustment on top (earlier in the Deep South, later in the Upper Midwest). Enter your ZIP for your own dates, or read the four representative locations below.

Planting windows and crop timing here are computed from USDA/NOAA climate data and the university extension sources cited below, not a site visit or soil test. Treat this as a starting point: local conditions vary, and a local nursery or extension office can advise on your exact site. See our full Disclaimer.

Representative timing, by climate band

When to plant Kale in four US climates

Each column is the most nursery-dense location in our directory within that USDA zone band, computed from that location's own real median frost dates, not a made-up example.

Stage Zones 1-5 (cold winters)
Fort Plain, NY 		Zones 6-7 (temperate)
McMinnville, TN 		Zones 8-9 (warm)
Apopka, FL 		Zones 10-13 (hot, frost rare or absent)
Loxahatchee, FL
Start seed indoors Not available Not available Not available –
Direct-sow outside Mar 25–Apr 8 Feb 24–Mar 10 Jan 13–Jan 27 –
Transplant outside Not available Not available Not available –
Fall planting Aug 11–Sep 8 Sep 4–Oct 2 Nov 3–Dec 1 –
Expected harvest May 14–Jun 17 Apr 15–May 19 Mar 4–Apr 7 –

Zones 10-13 (hot, frost rare or absent) (Loxahatchee, FL): Frost is rare here (about 359 frost-free days a year); most years see little or no hard freeze. This is a hardy crop. In climates like this one, hardy and semi-hardy crops typically go in during the cooler months (fall through late winter), not on a frost-relative schedule.

Kale goes into the ground four to six weeks before your last frost. Purdue Extension's hardy-crop window (HO-186-W) and Clemson Cooperative Extension's description of kale as highly cold-hardy, able to withstand frost (HGIC 1320), agree on that classification even though only Purdue states the number directly.

Days to maturity for a full-size harvest run 50 to 70 days, combining Clemson's 50-to-70 mature-harvest figure with Missouri Extension's 50 to 65. NC State Extension's 14-to-22-day figure is excluded from that range here; it reads as a baby-leaf harvest timing rather than a full-size crop, and mixing the two would understate how long kale actually takes to mature. Clemson separately gives 30 days for an immature harvest, closer to what NC State's shorter figure likely describes.

Kale also takes a fall planting, four to eight weeks before your first fall frost, per Purdue's explicit list. No minimum soil temperature is held for kale in any source checked. Because kale is hardy, both a cold-winter and a mild-winter climate can plant it close to real frost risk; the difference is mainly how long the cool finishing weather kale prefers actually lasts in each place.

Nurseries carry kale both as seed and as transplants for the spring and fall windows above; a transplant is the faster route to a baby-leaf harvest, while seed suits either a baby-leaf or full-size planting depending on when you sow it.

Frost hardiness

Hardy. Tolerates hard frost. Can go in the ground before the last frost date.

Days to maturity

50–70

Sourcing notes

Not covered by CSU's tables. PURDUE (Table 1) and Clemson ("highly cold-hardy... can withstand frost") agree on hardy classification; used PURDUE's hardy window (4-6wk before frost). DTM: Clemson gives 30 days immature / 50-70 days mature and MOEXT gives 50-65 days - used the mature-harvest range (50-70). NCSU's 14-22-day figure appears to describe baby-leaf/immature harvest and was excluded, flagged. No source gave a crop-specific min soil temp for kale (left blank rather than guessed).

Related crops

Growing zones for this crop

Nurseries near these locations

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Sources