When should I plant Rhubarb in Zone 9b?

Start Rhubarb seeds indoors around Dec 30. Transplant outdoors after Feb 10. Expect first harvest around Feb 10.

What is the last frost date for Zone 9b?

The average last spring frost date for Zone 9b is Mar 10. The first fall frost averages Nov 15, giving a 250-day growing season.

Can I grow Rhubarb in Zone 9b?

Yes. Rhubarb needs 90 days to harvest. Zone 9b has a 250-day growing season, which is sufficient.

Growing Rhubarb in Zone 9b

Zone 9b has warm winters and an extended growing season -- excellent for heat-loving crops like Rhubarb. Siste frost: Mar 10. Første frost: Nov 15.

Planting Calendar

Indoor

Outdoor

Harvest

Dec 30Nov 15

Season: Mar 10 – Nov 15 (250 dager)

Sone9b

Siste frostMar 10

Første frostNov 15

Sesong250 dager

Høst90 dager

SolFull Sol

When to Plant Rhubarb in Zone 9b

Start Seeds Indoors: Dec 30

Start Rhubarb seeds indoors around Dec 30 (10 uker før siste frost). Optimal germination temperature: 65F. Germinates in 7-21 days.

Transplant Outdoors: Feb 10

Transplant Rhubarb seedlings outdoors after Feb 10. Wait until soil temperature reaches 40F. Space plants at 1/m² (30cm avstand). Harden off plants for a week before moving outside.

Harvest: Feb 10

First harvest approximately Feb 10 (~365 dager from transplant). Continue harvesting until first frost (Nov 15). 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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