When should I plant 洋葱 in Zone 4a?

Start 洋葱 seeds indoors around 2月24日. Transplant outdoors after 4月7日. Expect first harvest around 6月26日.

What is the last frost date for Zone 4a?

The average last spring frost date for Zone 4a is 5月5日. The first fall frost averages 10月1日, giving a 149-day growing season.

Can I grow 洋葱 in Zone 4a?

Yes. 洋葱 needs 110 days to harvest. Zone 4a has a 149-day growing season, which is sufficient.

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🧅 种植洋葱区域 4a

Zone 4a has cold winters and a moderate growing season. Timing is key for 洋葱 in this zone. 末次霜冻: 5月5日. 初次霜冻: 10月1日.

Planting Calendar

Indoor

Outdoor

Harvest

2月24日10月1日

Season: 5月5日 – 10月1日 (149 天)

区域4a

末次霜冻5月5日

初次霜冻10月1日

生长季149 天

收获110 天

日照全日照

When to Plant 洋葱 in Zone 4a

Start Seeds Indoors: 2月24日

Start 洋葱 seeds indoors around 2月24日 (10 周(最后霜冻前)). Optimal germination temperature: 70F. Germinates in 7-14 days.

Transplant Outdoors: 4月7日

Transplant 洋葱 seedlings outdoors after 4月7日. Wait until soil temperature reaches 45F. Space plants at 9/m² (10cm 间距). Harden off plants for a week before moving outside.

Harvest: 6月26日

First harvest approximately 6月26日 (~80 天 from transplant). Continue harvesting until first frost (10月1日).

伴生植物

✅ 草莓✅ 卷心菜✅ 甜菜✅ 生菜✅ 胡萝卜✅ 番茄

❌ 豆类❌ 豌豆

洋葱其他区域

1a 1b 2a 2b 3a 3b 4a 4b 5a 5b 6a 6b 7a 7b 8a 8b 9a 9b 10a 10b 11a 11b 12a 12b 13a 13b

规划花园洋葱

Track 洋葱 from seed to harvest with personalized frost dates, watering recommendations, and companion planting visualization.

Start Free 洋葱 Growing Guide

🧅 种植 洋葱 区域 4a