When should I plant Rhubarb in Zone 12a?

Start Rhubarb seeds indoors around Oct 23. Transplant outdoors after Dec 4. Expect first harvest around Dec 4.

What is the last frost date for Zone 12a?

The average last spring frost date for Zone 12a is Jan 1. The first fall frost averages Dec 31, giving a 364-day growing season.

Can I grow Rhubarb in Zone 12a?

Yes. Rhubarb needs 90 days to harvest. Zone 12a has a 364-day growing season, which is sufficient.

Growing Rhubarb in Zone 12a

Zone 12a has a year-round growing season. Rhubarb can be planted almost any time with proper planning. Last frost: Jan 1. First frost: Dec 31.

Planting Calendar

Indoor

Outdoor

Harvest

Oct 23Dec 31

Season: Jan 1 – Dec 31 (364 days)

Zone12a

Last FrostJan 1

First FrostDec 31

Season Length364 days

Days to Harvest90

SunFull Sun

Frost ToleranceHeavy

Spacing1/sqft (12" apart)

When to Plant Rhubarb in Zone 12a

Start Seeds Indoors: Oct 23

Start Rhubarb seeds indoors around Oct 23 (10 weeks before last frost). Optimal germination temperature: 65°F. Germinates in 7–21 days.

Transplant Outdoors: Dec 4

Transplant Rhubarb seedlings outdoors after Dec 4. 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 4

First harvest approximately Dec 4 (~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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