Field guide
When to plant grain amaranth in USDA Zones 9–10
In USDA Zones 9–10, the planner’s broad outdoor planting window for grain amaranth runs from February to April, with a second window from September to October. Grain Amaranth takes 90–120 days from planting to first harvest.
Open plannerPlanting calendar for USDA Zones 9–10
- Spring planting
- February to April
- Fall planting
- September to October
- Days to harvest
- 90–120 days
- Water needs
- low
What USDA Zones 9–10 do—and do not—tell you
These zones span average annual extreme minimum temperatures of roughly 20°F to 40°F. That is useful climate context, but it does not determine your exact frost dates. Check a local forecast or county Extension calendar before planting tender crops.
How to know when to harvest
- Seed heads are dry and the grain resists a thumbnail
- Stalks have shifted from green to straw colored
Want a plan that accounts for your crops, growing method, equipment, and plant conditions? Open the free planner for a daily crop checklist and adaptive harvest forecast.
About this field guide
A local-first garden agent and neighborhood commons planner for food, water, tools, repair, clean energy, and resilient communication. Your profile and garden history stay on this device.