Start indoors or direct sow?

Direct sow popcorn because its roots are easily disturbed and it grows quickly in warm soil. Indoor starts are usually unnecessary and can reduce establishment.

When to start Popcorn seeds

Direct sow 1 to 2 weeks after the last spring frost, once soil is at least 60°F, preferably warmer. In short-season northern areas, use an early-maturing popcorn variety rather than starting it indoors.

How to sow the seeds

Sow seeds 1 to 1 1/2 inches deep in loose, fertile, well-drained garden soil. Plant in rows or a block, spacing seeds about 8 to 12 inches apart, then thin as needed to the variety's final spacing.

Germination

Seeds usually germinate in 7 to 14 days in soil around 65 to 85°F. Keep the seed bed evenly moist but not saturated until seedlings emerge.

Seedling care

Give plants full sun and steady moisture, especially while they are tasseling and forming ears. Keep weeds down early, thin crowded seedlings, and avoid overhead watering late in the day if foliage stays wet.

Transplanting & hardening off

Direct sown, so no transplanting is needed. Protect young plants from an unexpected late frost with a row cover if necessary.

Tips

Grow only one corn variety nearby if you want predictable popcorn quality, since corn cross-pollinates readily. Do not plant until the ground is truly warm, because cold, wet soil can cause poor emergence.

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