When should I plant Rhubarb in Zone 4a?

Start Rhubarb seeds indoors around 2月24日. Transplant outdoors after 4月7日. Expect first harvest around 4月7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 Rhubarb in Zone 4a?

Yes. Rhubarb needs 90 days to harvest. Zone 4a has a 149-day growing season, which is sufficient.

种植 Rhubarb 区域 4a

Zone 4a has cold winters and a moderate growing season. Timing is key for Rhubarb 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90 天

日照全日照

When to Plant Rhubarb in Zone 4a

Start Seeds Indoors: 2月24日

Start Rhubarb seeds indoors around 2月24日 (10 周(最后霜冻前)). Optimal germination temperature: 65F. Germinates in 7-21 days.

Transplant Outdoors: 4月7日

Transplant Rhubarb seedlings outdoors after 4月7日. Wait until soil temperature reaches 40F. Space plants at 1/m² (30cm 间距). Harden off plants for a week before moving outside.

Harvest: 4月7日

First harvest approximately 4月7日 (~365 天 from transplant). Continue harvesting until first frost (10月1日). Rhubarb can overwinter in mild climates for continued harvest.

Rhubarb 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

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