When to Plant Marigold in Zone 9b

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

Plant Marigold in Zone 9b

  • Start indoors: Jan 31
  • Transplant: Mar 21 — after last frost (Feb 21)
  • First harvest: May 12 (45–65 days)
⚠️ Zone 9b last frost: Feb 21. Don't plant frost-sensitive crops before this date.
Last frost
Feb 21
First frost
Dec 2
Growing season
284 days
Zone 9b is the warmer half of Zone 9

Zone 9b has a last frost around Feb 21 and first frost around Dec 2, giving you approximately 284 growing days. This is about 2 weeks longer than Zone 9a. For more details see the Zone 9 complete guide.

Other Zones for Marigold

Zone 2Zone 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.