When should I plant Rhubarb in Zone 4a?

Start Rhubarb seeds indoors around 24 Th2. Transplant outdoors after 7 Th4. Expect first harvest around 7 Th4.

What is the last frost date for Zone 4a?

The average last spring frost date for Zone 4a is 5 Th5. The first fall frost averages 1 Th10, 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.

Growing Rhubarb in Zone 4a

Zone 4a has cold winters and a moderate growing season. Timing is key for Rhubarb in this zone. Sương giá cuối: 5 Th5. Sương giá đầu: 1 Th10.

Planting Calendar

Indoor

Outdoor

Harvest

24 Th21 Th10

Season: 5 Th5 – 1 Th10 (149 ngày)

Vùng4a

Sương giá cuối5 Th5

Sương giá đầu1 Th10

Mùa vụ149 ngày

Thu hoạch90 ngày

Ánh sángNắng hoàn toàn

When to Plant Rhubarb in Zone 4a

Start Seeds Indoors: 24 Th2

Start Rhubarb seeds indoors around 24 Th2 (10 tuần trước sương giá cuối). Optimal germination temperature: 65F. Germinates in 7-21 days.

Transplant Outdoors: 7 Th4

Transplant Rhubarb seedlings outdoors after 7 Th4. Wait until soil temperature reaches 40F. Space plants at 1/m² (30cm khoảng cách). Harden off plants for a week before moving outside.

Harvest: 7 Th4

First harvest approximately 7 Th4 (~365 ngày from transplant). Continue harvesting until first frost (1 Th10). Rhubarb can overwinter in mild climates for continued harvest.

Rhubarb in Other Zones

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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