When to Transplant Seedlings Outside
Transplant when seedlings have 2–4 sets of true leaves, nights are above 50°F (tender) or 40°F (hardy), and you’ve hardened them off for 7–10 days.
Transplanting too early kills seedlings. Too late stunts them.
When to Transplant
| Factor | Requirement |
|---|---|
| True leaves | 2-4 sets |
| Night temp (tender) | Above 50°F |
| Night temp (hardy) | Above 40°F |
| Hardening off | 7-10 days |
| Frost | Past last frost |
Hardening Off
| Day | Outdoor Time |
|---|---|
| 1-2 | 1 hour, indirect |
| 3-4 | 2 hours, morning sun |
| 5-6 | 4 hours |
| 7-8 | 6 hours |
| 9-10 | Full day |
How to Transplant
- Water seedling before.
- Dig hole larger than root ball.
- Bury stem deep (tomatoes especially).
- Water thoroughly.
- Shade for 2-3 days.
Common Questions
Can I transplant earlier? Risky. Frost kills tender plants.
Do I need to harden off? Yes. Otherwise sunscald.
What if it’s cloudy? Good day to transplant.
Should I transplant in the evening? Yes. Less stress.
What about root-bound seedlings? Loosen roots gently.
How do I know it’s ready? Roots fill the pot but aren’t circling.