What to Plant in December — Zone 10

Start seeds indoors — Counted back from the last frost so transplants are ready on time.

🥬 Lettuce	Dec 14 – Dec 28	45–60 days to maturity
🥬 Kale	Dec 14 – Dec 28	55–65 days to maturity
🌈 Swiss Chard	Dec 21 – Jan 4	50–60 days to maturity
🍃 Collard Greens	Dec 14 – Dec 28	60–75 days to maturity
🥬 Cabbage	Nov 30 – Dec 14	65–85 days to maturity
🥦 Broccoli	Dec 7 – Dec 21	60–75 days to maturity
🥦 Cauliflower	Dec 7 – Dec 21	60–80 days to maturity
🥬 Brussels Sprouts	Dec 14 – Dec 28	90–110 days to maturity
🍅 Tomatoes	Nov 30 – Dec 14	60–85 days to maturity
🍏 Tomatillos	Nov 30 – Dec 14	70–80 days to maturity
🥒 Cucumbers	Dec 28 – Jan 4	50–70 days to maturity
🥒 Zucchini	Dec 28 – Jan 4	45–60 days to maturity
🎃 Winter Squash	Dec 28 – Jan 4	85–110 days to maturity
🎃 Pumpkins	Dec 28 – Jan 4	90–110 days to maturity
🍉 Watermelon	Dec 28 – Jan 4	75–95 days to maturity
🍈 Cantaloupe	Dec 28 – Jan 4	75–90 days to maturity
🌶️ Okra	Dec 28 – Jan 4	55–65 days to maturity
🌿 Basil	Dec 14 – Dec 28	30–60 days to maturity
🌱 Chives	Nov 30 – Dec 14	75–85 days to maturity
🌿 Oregano	Nov 30 – Dec 14	80–90 days to maturity
🌸 Zinnias	Dec 28 – Jan 4	60–70 days to maturity
🏵️ Marigolds	Dec 14 – Dec 28	50–60 days to maturity

Transplant outdoors — Set out sturdy transplants during these windows.

🥬 Lettuce	Dec 28 – Jan 11	45–60 days to maturity
🥬 Kale	Dec 28 – Jan 11	55–65 days to maturity
🍃 Collard Greens	Dec 28 – Jan 11	60–75 days to maturity
🥬 Cabbage	Dec 28 – Jan 11	65–85 days to maturity
🧅 Onions	Dec 14 – Dec 28	90–110 days to maturity
🧅 Leeks	Dec 28 – Jan 11	100–120 days to maturity

Direct sow — Seeds straight into garden soil.

🫛 Peas	Dec 14 – Dec 28	55–70 days to maturity
🥬 Lettuce	Dec 28 – Jan 25	45–60 days to maturity
🍃 Spinach	Dec 14 – Dec 28	40–50 days to maturity
🥬 Kale	Dec 28 – Jan 11	55–65 days to maturity
🌿 Arugula	Dec 21 – Jan 4	30–40 days to maturity
🥬 Kohlrabi	Dec 28 – Jan 11	45–60 days to maturity
🫒 Beets	Dec 28 – Jan 11	50–65 days to maturity
🌶️ Radishes	Dec 21 – Jan 4	22–30 days to maturity
🥔 Turnips	Dec 28 – Jan 11	40–55 days to maturity
🧅 Onions	Dec 28 – Jan 11	90–110 days to maturity
🧅 Scallions	Dec 28 – Jan 11	60–70 days to maturity
🥔 Potatoes	Dec 28 – Jan 11	70–100 days to maturity
🌿 Mustard Greens	Dec 28 – Jan 11	35–45 days to maturity

Fall planting — Counted back from the first fall frost.

🧄 Garlic

Nov 8 – Dec 6

plant cloves; harvest next summer

Windows use zone 10's typical frost dates (Jan 25 / Dec 20). For your own city's dates, run the frost lookup — the planting calendar then localizes everything automatically.