When should I plant Rhubarb in Zone 1a?

Start Rhubarb seeds indoors around Mar 16. Transplant outdoors after Apr 27. Expect first harvest around Apr 27.

What is the last frost date for Zone 1a?

The average last spring frost date for Zone 1a is May 25. The first fall frost averages Aug 28, giving a 95-day growing season.

Can I grow Rhubarb in Zone 1a?

Yes. Rhubarb needs 90 days to harvest. Zone 1a has a 95-day growing season, which is sufficient.

Growing Rhubarb in Zone 1a

Zone 1a has harsh winters and a short growing season. Start Rhubarb early indoors to maximize your harvest window. Viimeinen halla: May 25. Ensimmäinen halla: Aug 28.

Planting Calendar

Indoor

Outdoor

Harvest

Mar 16Aug 28

Season: May 25 – Aug 28 (95 päivää)

Vyöhyke1a

Viimeinen hallaMay 25

Ensimmäinen hallaAug 28

Kausi95 päivää

Sato90 päivää

AurinkoTäysi Aurinko

When to Plant Rhubarb in Zone 1a

Start Seeds Indoors: Mar 16

Start Rhubarb seeds indoors around Mar 16 (10 viikkoa ennen viimeistä hallaa). Optimal germination temperature: 65F. Germinates in 7-21 days.

Transplant Outdoors: Apr 27

Transplant Rhubarb seedlings outdoors after Apr 27. Wait until soil temperature reaches 40F. Space plants at 1/m² (30cm välein). Harden off plants for a week before moving outside.

Harvest: Apr 27

First harvest approximately Apr 27 (~365 päivää from transplant). Continue harvesting until first frost (Aug 28). 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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