DibbleSeed starting calendar for Zone 4
Zone 4's last spring frost lands around May 10 in a typical year. The windows below are the best stretches to start each crop indoors, from the same climate engine the Dibble app uses. Move the seedlings out when the transplant window opens.
Cool climate with a brief warm window. Indoor starts and season extension help.
20 crops, in the order they need starting. Crops the engine rules out for Zone 4, or that do not need an indoor start there, are left off; each name opens its full dated page.
Seed starting calendar for Zone 4
Last spring frost around May 10. dibblegarden.com
| Crop | Start indoors | Move outside | Days to maturity |
|---|---|---|---|
| Celery | Feb 20 to Apr 6 | May 1 to Jun 15 | 120 |
| Leek | Feb 21 to May 4 | Apr 18 to Jun 29 | 120 |
| Onion | Feb 27 to Mar 27 | Apr 24 to May 22 | 100 |
| Parsley | Feb 27 to Jun 18 | Apr 24 to Aug 13 | 75 |
| Kale | Mar 14 to Aug 9 | Apr 11 to Sep 6 | 60 |
| Sage | Mar 15 to Apr 25 | May 10 to Jun 20 | 90 |
| Collard Greens | Mar 17 to Aug 4 | Apr 14 to Sep 1 | 60 |
| Cabbage | Mar 21 to Jul 21 | Apr 18 to Aug 18 | 70 |
| Hot Pepper | Mar 23 to Apr 13 | Jun 1 to Jun 22 | 80 |
| Pepper | Mar 25 to Apr 16 | Jun 3 to Jun 25 | 70 |
| Broccoli | Mar 26 to Jul 20 | Apr 23 to Aug 17 | 65 |
| Oregano | Mar 29 to May 9 | May 10 to Jun 20 | 90 |
| Chives | Mar 29 to May 9 | Apr 26 to Jun 6 | 80 |
| Brussels Sprouts | Mar 30 to Jun 1 | May 11 to Jul 13 | 100 |
| Eggplant | Apr 2 to Apr 22 | Jun 11 to Jul 1 | 75 |
| Tomato | Apr 14 to May 19 | Jun 2 to Jul 7 | 75 |
| Marigold | Apr 21 to Jun 21 | Jun 2 to Aug 2 | 50 |
| Basil | Apr 28 to Jul 4 | Jun 2 to Aug 8 | 60 |
| Tomatillo | Apr 28 to Jun 3 | Jun 2 to Jul 8 | 75 |
| Cauliflower | May 28 to Jul 11 | Jun 25 to Aug 8 | 70 |
Other zones
Plant at the right time this season
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