When should I plant Rhubarb in Zone 11b?

Start Rhubarb seeds indoors around Nov 6. Transplant outdoors after Dec 18. Expect first harvest around Dec 18.

What is the last frost date for Zone 11b?

The average last spring frost date for Zone 11b is Jan 15. The first fall frost averages Dec 31, giving a 350-day growing season.

Can I grow Rhubarb in Zone 11b?

Yes. Rhubarb needs 90 days to harvest. Zone 11b has a 350-day growing season, which is sufficient.

Growing Rhubarb in Zone 11b

Zone 11b has a year-round growing season. Rhubarb can be planted almost any time with proper planning. Last frost: Jan 15. First frost: Dec 31.

Planting Calendar

Indoor

Outdoor

Harvest

Nov 6Dec 31

Season: Jan 15 – Dec 31 (350 days)

Zone11b

Last FrostJan 15

First FrostDec 31

Season Length350 days

Days to Harvest90

SunFull Sun

Frost ToleranceHeavy

Spacing1/sqft (12" apart)

When to Plant Rhubarb in Zone 11b

Start Seeds Indoors: Nov 6

Start Rhubarb seeds indoors around Nov 6 (10 weeks before last frost). Optimal germination temperature: 65°F. Germinates in 7–21 days.

Transplant Outdoors: Dec 18

Transplant Rhubarb seedlings outdoors after Dec 18. Wait until soil temperature reaches 40°F. Space plants at 1/sqft (12" apart). Harden off plants for a week before moving outside.

Harvest: Dec 18

First harvest approximately Dec 18 (~365 days from transplant). Continue harvesting until first frost (Dec 31). 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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