Planting windows for Mt Diablo Junction
Computed from Mt Diablo Junction's own frost dates. Click any crop for the full zone-10 growing guide — varieties, spacing, fall plantings, and more.
| Crop | Start seeds indoors | Transplant | Direct sow |
|---|---|---|---|
| 🍅 Tomatoes | Jan 11 – Jan 25 | Mar 15 – Mar 22 | — |
| 🫑 Peppers | Dec 28 – Jan 11 | Mar 22 – Mar 29 | — |
| 🥬 Lettuce | Jan 25 – Feb 8 | Feb 8 – Feb 22 | Feb 8 – Mar 8 |
| 🫛 Peas | — | — | Jan 25 – Feb 8 |
| 🥕 Carrots | — | — | Feb 15 – Mar 8 |
| 🥦 Broccoli | Jan 18 – Feb 1 | Feb 15 – Mar 1 | — |
| 🥬 Kale | Jan 25 – Feb 8 | Feb 8 – Feb 22 | Feb 8 – Feb 22 |
| 🥒 Cucumbers | Feb 8 – Feb 15 | Mar 15 – Mar 22 | Mar 15 – Mar 22 |
| 🥒 Zucchini | Feb 8 – Feb 15 | Mar 15 – Mar 22 | Mar 15 – Mar 22 |
| 🫘 Green Beans (Bush) | — | — | Mar 15 – Mar 22 |
| 🌽 Sweet Corn | — | — | Mar 15 – Mar 22 |
| 🌿 Basil | Jan 25 – Feb 8 | Mar 15 – Mar 22 | Mar 22 – Mar 29 |
| 🧄 Garlic | — | — | Fall: Nov 10 – Dec 8 |
Want this for all 50 crops, or as a printable seed-shelf schedule? Use the planting calendar and the seed starting scheduler — both can use Mt Diablo Junction's dates automatically after a lookup.
Reading the season in Mt Diablo Junction
With roughly 289 frost-free days, Mt Diablo Junction gardens fit long-season crops — melons, winter squash, sweet potatoes — with room left for spring and fall rounds of greens and roots. The first frost around Dec 22 is late enough that fall planting is a full second season, not an afterthought.