When to Plant Corn (Sweet) in Zone 3

Zea mays

Last updated: May 15, 2026 · Sources: USDA, NOAA, Cooperative Extension
Action Plan

Plant Corn (Sweet) in Zone 3

  • Direct sow: May 29 — after last frost (May 15)
  • First harvest: Aug 5 (60–100 days)
⚠️ Don't plant before last frost (May 15) — cold snaps kill young transplants.
Last frost
May 15
First frost
Sep 15
Growing season
123 days
Quick Facts
Sunlight ☀️ Full Sun
Water Needs 💧💧💧 High
Spacing 12 inches apart
Planting Depth 1.5 inch
Min Soil Temp 60°F
Germination 5–12 days
Days to Maturity 60–100 days
Frost Tolerance No frost tolerance
Soil pH 6.0–6.8
Difficulty Moderate
What you'll need — Zone 3
🛒 Corn (Sweet) — Seeds & Supplies
  • 🌱 Sweet Corn Seeds
  • 🌱 Corn Fertilizer
  • 🌱 Garden Hose Soaker

Search for these at your local garden center or nursery.

Growing Tips

  • Plant in blocks, not single rows — corn is wind-pollinated.
  • Minimum block size 4×4 rows for good pollination.
  • Direct sow only — corn doesn't transplant well.
  • Water deeply at the base during tasseling.
  • Harvest when silks are brown and a kernel releases milky juice.

Common Mistakes

  • Planting in a single row — poor pollination leads to gaps in kernels.
  • Planting before soil is 60°F.
  • Over-fertilizing before tasseling.
  • Letting corn over-mature — sweetness turns to starch within days.

Companion Planting

Companion planting improves growth, deters pests, and makes better use of garden space.

✓ Good Companions

Beans Squash Cucumber

✗ Avoid Nearby

Tomato

Corn (Sweet) Schedule — All Zones

ZoneStart IndoorsTransplant Direct SowHarvest StartHarvest End
Zone 3 — — May 29 Aug 5 Sep 12
Zone 4 — — May 24 Jul 31 Sep 22
Zone 5 — — May 14 Jul 21 Sep 29
Zone 6 — — Apr 29 Jul 6 Sep 14
Zone 7 — — Apr 19 Jun 26 Sep 4
Zone 8 — — Apr 3 Jun 10 Aug 19
Zone 9 — — Mar 14 May 21 Jul 30
Zone 10 — — Feb 24 May 3 Jul 12
Zone 11 — — Jan 29 Apr 7 Jun 16
📚 Data Sources
Frost dates: NOAA Climate Normals 1991–2020, National Centers for Environmental Information.
Hardiness zones: USDA Plant Hardiness Zone Map, Agricultural Research Service.
Growing requirements: Cooperative Extension Services — NC State, Penn State, University of Florida IFAS.
Companion planting: Cornell University Cooperative Extension.
Data compiled from public agricultural sources. Always verify with your local extension office for micro-climate adjustments.