DibbleSeed starting calendar
When to start seeds indoors, by hardiness zone. 20 crops in the library are worth starting inside. Pick your zone for dated windows from the same climate engine the Dibble app uses, or use the chart below for the usual rule of thumb in weeks before your last spring frost.
How to start seeds indoors, step by step · Find your frost dates
Seed starting chart: weeks before your last frost
A rule of thumb that works in any zone: take your last spring frost date and count back the weeks in the first column. The zone pages below give dated windows from the climate engine, which also weighs heat and rain.
Seed starting calendar
dibblegarden.com/seed-starting-calendar/
| Crop | Start indoors | Move outside | Days to maturity |
|---|---|---|---|
| Brussels Sprouts | 22 weeks before first fall frost | 16 weeks before first fall frost | 100 |
| Onion | 10 weeks before last frost | 2 weeks before last frost | 100 |
| Leek | 10 weeks before last frost | 2 weeks before last frost | 120 |
| Celery | 10 weeks before last frost | at last frost | 120 |
| Parsley | 9 weeks before last frost | 1 week before last frost | 75 |
| Sage | 8 weeks before last frost | at last frost | 90 |
| Pepper | 6 weeks before last frost | 4 weeks after last frost | 70 |
| Kale | 6 weeks before last frost | 2 weeks before last frost | 60 |
| Broccoli | 6 weeks before last frost | 2 weeks before last frost | 65 |
| Cabbage | 6 weeks before last frost | 2 weeks before last frost | 70 |
| Oregano | 6 weeks before last frost | at last frost | 90 |
| Chives | 6 weeks before last frost | 2 weeks before last frost | 80 |
| Eggplant | 6 weeks before last frost | 4 weeks after last frost | 75 |
| Cauliflower | 6 weeks before last frost | 2 weeks before last frost | 70 |
| Hot Pepper | 6 weeks before last frost | 4 weeks after last frost | 80 |
| Collard Greens | 6 weeks before last frost | 2 weeks before last frost | 60 |
| Tomato | 4 weeks before last frost | 3 weeks after last frost | 75 |
| Marigold | 4 weeks before last frost | 2 weeks after last frost | 50 |
| Basil | 2 weeks before last frost | 3 weeks after last frost | 60 |
| Tomatillo | 2 weeks before last frost | 3 weeks after last frost | 75 |
Dated for your zone
Zone 3
Last frost May 18Zone 4
Last frost May 10Zone 5
Last frost May 3Zone 6
Last frost April 25Zone 7
Last frost April 8Zone 8
Last frost March 13Zone 9
Last frost February 10Zone 10
Last frost none in a typical yearZone 11
Last frost none in a typical yearPlant at the right time this season
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