Pioneer 399· Corn
Planting Schedule
Add Pioneer 399 to your garden to build a schedule and get reminders.
| Milestone | Date |
|---|---|
| Start Indoors | Direct Sow |
| Last Frost | May 13th |
| Transplant / Direct Sow Outdoors | May 13th |
| Harvest Begins | Jul 24th |
| Harvest Ends | Sep 27th |
Crop Details
Transplant Conditions:
Wait until soil reaches 55°F
and nights stay above 45°F
before moving outdoors.
| Trait | Value |
|---|---|
| Days to Maturity | 72 |
| Sun Requirements | ☀️ Full Sun |
| Growth Habit | Upright |
| Support Needed | None |
| Planting Depth | Normal |
| Germination Temp (°F) | 60 |
| Min Soil Temp (°F) | 55 |
| Min Night Temp (°F) | 45 |
| Harden Off (days) | Not Required |
Expert Note: For best sweet flavor, grow in blocks (not rows) and keep soil evenly moist after tasseling; harvest when kernels are filled and milky (about 18–22 days after silk).