What to Plant in April — Zone 1

April ends about 7 weeks before zone 1's average last frost (Jun 15) — prime seed-starting territory.

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

🥬 Cabbage	Apr 20 – May 4	65–85 days to maturity
🥦 Broccoli	Apr 27 – May 11	60–75 days to maturity
🥦 Cauliflower	Apr 27 – May 11	60–80 days to maturity
🧅 Onions	Apr 6 – Apr 20	90–110 days to maturity
🧅 Leeks	Apr 6 – Apr 20	100–120 days to maturity
🥬 Celery	Apr 6 – Apr 20	100–120 days to maturity
🍅 Tomatoes	Apr 20 – May 4	60–85 days to maturity
🫑 Peppers	Apr 6 – Apr 20	60–90 days to maturity
🍆 Eggplant	Apr 6 – Apr 20	65–80 days to maturity
🍏 Tomatillos	Apr 20 – May 4	70–80 days to maturity
🌿 Parsley	Apr 6 – Apr 20	70–90 days to maturity
🌱 Chives	Apr 20 – May 4	75–85 days to maturity
🌿 Thyme	Apr 6 – Apr 20	90–120 days to maturity
🌿 Oregano	Apr 20 – May 4	80–90 days to maturity

Windows use zone 1's typical frost dates (Jun 15 / Aug 25). For your own city's dates, run the frost lookup — the planting calendar then localizes everything automatically.

Frequently asked questions

What can I plant outside in April in zone 1?

Nothing goes outside yet in zone 1 — April is for starting seeds indoors (cabbage, broccoli, cauliflower, onions, leeks, celery, tomatoes, peppers, and 6 more). Outdoor planting opens closer to the Jun 15 average last frost.

What seeds should I start indoors in April in zone 1?

Cabbage, broccoli, cauliflower, onions, leeks, celery, tomatoes, peppers, and 6 more — each is counted back from zone 1's average last frost around Jun 15, so transplants are ready exactly when the garden is.

Is April the right time for tomatoes in zone 1?

For seed-starting, yes: sow indoors Apr 20 – May 4. Transplanting waits until after the Jun 15 average last frost.