When to Plant Kale in Zone 3

Brassica oleracea var. sabellica

Last updated: Apr 29, 2026 · Sources: USDA, NOAA, Cooperative Extension
Action Plan

Plant Kale in Zone 3

  • Start indoors: Mar 27
  • Transplant: May 15 — after last frost (May 15)
  • First harvest: Jul 11 (50–75 days after planting)
⚠️ 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 💧💧 Moderate
Spacing 18 inches apart
Planting Depth 0.5 inch
Min Soil Temp 40°F
Germination 5–10 days
Days to Maturity 50–75 days
Frost Tolerance Heavy frost tolerance
Soil pH 6.0–7.5
Difficulty Easy
What you'll need — Zone 3
🛒 Kale — Seeds & Supplies
  • 🌱 Kale Seeds Variety Pack
  • 🌱 Row Cover + Hoops Kit
  • 🌱 Organic Insect Control

Search for these at your local garden center or nursery.

Growing Tips

  • Kale improves in flavor after frost — the cold converts starches to sugars.
  • Harvest lower outer leaves, leaving the central growing tip intact.
  • Plant in late summer for a fall/winter crop — this is when kale is at its best.
  • Use row cover to extend harvest into winter in colder zones.
  • Massage raw kale leaves with olive oil before eating to soften texture.

Common Mistakes

  • Only growing spring kale — the fall/winter crop is far superior in flavor.
  • Harvesting the growing tip — this kills the plant. Always harvest outer leaves.
  • Planting near other brassicas without rotating — builds up clubroot and other diseases in soil.
  • Not controlling cabbage worms early — check the undersides of leaves regularly.

Companion Planting

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

✓ Good Companions

Beets Celery Onion

✗ Avoid Nearby

Tomato Strawberry

Kale Schedule — All Zones

ZoneStart IndoorsTransplant Direct SowHarvest StartHarvest End
Zone 2 Apr 6 May 25 — Jul 21 Sep 2
Zone 3 Mar 27 May 15 — Jul 11 Sep 4
Zone 4 Mar 22 May 10 — Jul 6 Aug 30
Zone 5 Mar 12 Apr 30 — Jun 26 Aug 20
Zone 6 Feb 25 Apr 15 — Jun 11 Aug 5
Zone 7 Feb 15 Apr 5 — Jun 1 Jul 26
Zone 8 Jan 30 Mar 20 — May 16 Jul 10
Zone 9 Jan 10 Feb 28 — Apr 26 Jun 20
Zone 10 Dec 23 Feb 10 — Apr 8 Jun 2
Zone 11 Dec 17 Jan 15 Jan 15 Mar 13 May 7

Other Zones for Kale

Zone 2 · Zone 4 · Zone 5 · Zone 6 · Zone 7 · Zone 8 · Zone 9 · Zone 10 · Zone 11

📚 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.