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When to plant Swiss Chard

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 Swiss Chard 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 Apr 8–May 6 Mar 10–Apr 7 Jan 27–Feb 24 –
Transplant outside Not available Not available Not available –
Fall planting Not available Not available Not available –
Expected harvest May 10–Jul 10 Apr 11–Jun 11 Feb 28–Apr 30 –

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 semi 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.

Swiss chard goes into the ground anywhere from four weeks before your last frost to right at it. Colorado State University Extension's semi-hardy rule (Fact Sheet 7.212) gives zero to two weeks before frost; Purdue Extension (HO-186-W) gives two to four weeks before for the same tier, the same gap this page finds between the two sources on carrots, beets, and parsnip. Both windows are published together rather than merged.

Soil should read 40°F at seeding, a figure Colorado State and Purdue agree on exactly. Days to maturity split by counting convention: NC State's 32-to-42-day figure looks like it is counted from transplant, while Colorado State's 60, Missouri Extension's 55 to 65, and Clemson Cooperative Extension's 40 to 45 (HGIC 1320) cluster closer together and are likely counted from seed. The combined 32-to-65 range is reported with that convention difference flagged rather than resolved.

This page shows no fall-planting window for chard, even though Virginia and NC State's calendars show clear fall culture; chard does not appear on Purdue's explicit fall-crop list, so rather than infer a weeks-before-first-frost number Purdue never states, that field is left blank. Because chard is semi-hardy, a cold-winter climate should lean toward the later end of the spring window; a mild-winter climate can grow chard through much of the year rather than around one planting date.

Swiss chard is sold both as seed and as transplants at the nursery; seed suits either a spring or a later planting, while a transplant gets you a faster first harvest.

Frost hardiness

Semi-hardy. Tolerates light frost. Best planted close to the last frost date.

Minimum soil temperature

40°F

For direct sowing/germination, where an Extension source stated it.

Days to maturity

32–65

Sourcing notes

CSU's semi-hardy window (0-2wk before) and PURDUE's (2-4wk before) unioned and flagged, consistent with the carrot/beet/parsnip pattern. CSU and PURDUE soil-temp minimums agree exactly at 40F. DTM spread is convention-driven: NCSU's 32-42 looks like it's from transplant; CSU (60), MOEXT (55-65) and Clemson (40-45) are closer together and likely from-seed - combined range reported, convention flagged. Not in PURDUE's explicit fall list even though VCE/NCSU show clear fall culture - left the fall field blank rather than infer a number.

Related crops

Growing zones for this crop

Nurseries near these locations

Sources