When to Plant Cauliflower in Zone 8

Brassica oleracea var. botrytis

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

Plant Cauliflower in Zone 8

  • Start indoors: Jan 30
  • Transplant: Mar 20 — after last frost (Mar 20)
  • First harvest: May 21 (55–80 days)
⚠️ Don't plant before last frost (Mar 20) — cold snaps kill young transplants.
Last frost
Mar 20
First frost
Nov 5
Growing season
230 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 55–80 days
Frost Tolerance Light frost tolerance
Soil pH 6.0–7.0
Difficulty Hard
What you'll need — Zone 8
🛒 Cauliflower — Seeds & Supplies
  • 🌱 Cauliflower Seeds
  • 🌱 Garden Twine
  • 🌱 Frost Blanket

Search for these at your local garden center or nursery.

Growing Tips

  • Blanch heads by folding large leaves over the developing head.
  • Most temperature-sensitive brassica — needs steady cool temps.
  • Start indoors 6–8 weeks early.
  • Water consistently — stress causes 'buttoning'.
  • Harvest when heads are firm and compact.

Common Mistakes

  • Not blanching — exposed heads turn yellow.
  • Temperature swings — causes poor head development.
  • Inconsistent watering — causes buttoning.
  • Waiting too long to harvest — heads open quickly.

Companion Planting

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

✓ Good Companions

Celery Onion

✗ Avoid Nearby

Tomato Strawberry

Cauliflower Schedule — All Zones

ZoneStart IndoorsTransplant Direct SowHarvest StartHarvest End
Zone 3 Mar 27 May 15 — Jul 16 Sep 9
Zone 4 Mar 22 May 10 — Jul 11 Sep 4
Zone 5 Mar 12 Apr 30 — Jul 1 Aug 25
Zone 6 Feb 25 Apr 15 — Jun 16 Aug 10
Zone 7 Feb 15 Apr 5 — Jun 6 Jul 31
Zone 8 Jan 30 Mar 20 — May 21 Jul 15
Zone 9 Jan 10 Feb 28 — May 1 Jun 25
Zone 10 Dec 23 Feb 10 — Apr 13 Jun 7
Zone 11 Dec 17 Jan 15 — Mar 18 May 12
📚 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.