Start indoors or direct sow?

Direct sow spinach because it grows quickly and its roots are best left undisturbed. Indoor starts are possible in deep cells, but they offer little advantage and must be transplanted very young.

When to start Spinach seeds

Direct sow 4 to 6 weeks before the last spring frost, as soon as soil is workable. In mild regions, it can also be sown from late summer into fall for a cool-season crop.

How to sow the seeds

Sow seeds 1/2 inch deep in loose, well-prepared garden soil, spacing seed thinly in rows or bands. If using indoor starts, use deep individual cells with sterile mix and transplant promptly without breaking the root ball.

Germination

Spinach often germinates in 5 to 14 days. Cool, evenly moist soil around 45 to 70 F is favorable, while hot soil can cause poor or uneven emergence.

Seedling care

Keep the seedbed consistently moist until seedlings emerge, then water deeply enough to maintain steady growth. Thin crowded seedlings to their final spacing, keep weeds down, and avoid overwatering any indoor starts to prevent damping off.

Transplanting & hardening off

Direct-sown spinach needs no transplanting. If you started it in cells, harden off briefly and transplant while seedlings are small, before roots become crowded.

Tips

Soak seeds for a few hours before sowing if soil is dry, then plant immediately. Cover newly sown beds with light row cover if hard freezes or drying winds are expected.

General seed-starting guidance for US home gardens; timing depends on your local frost dates and variety. Page updated Aug 4, 2026.