When to Plant Cauliflower in Zone 9a

Brassica oleracea var. botrytis

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

Plant Cauliflower in Zone 9a

  • Start indoors: Jan 10
  • Transplant: Feb 28 — after last frost (Mar 7)
  • First harvest: May 1 (55–80 days)
⚠️ Zone 9a last frost: Mar 7. Don't plant frost-sensitive crops before this date.
Last frost
Mar 7
First frost
Nov 18
Growing season
256 days
Zone 9a is the colder half of Zone 9

Zone 9a has a last frost around Mar 7 and first frost around Nov 18, giving you approximately 256 growing days. This is about 2 weeks shorter than Zone 9b. For more details see the Zone 9 complete guide.

Other Zones for Cauliflower

Zone 3Zone 4Zone 5Zone 6Zone 7Zone 8Zone 9Zone 10Zone 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.