When should I plant Rhubarb in Zone 8b?

Start Rhubarb seeds indoors around Jan 11. Transplant outdoors after Feb 22. Expect first harvest around Feb 22.

What is the last frost date for Zone 8b?

The average last spring frost date for Zone 8b is Mar 22. The first fall frost averages Nov 10, giving a 233-day growing season.

Can I grow Rhubarb in Zone 8b?

Yes. Rhubarb needs 90 days to harvest. Zone 8b has a 233-day growing season, which is sufficient.

Growing Rhubarb in Zone 8b

Zone 8b has warm winters and an extended growing season — excellent for heat-loving crops like Rhubarb. Last frost: Mar 22. First frost: Nov 10.

Planting Calendar

Indoor

Outdoor

Harvest

Jan 11Nov 10

Season: Mar 22 – Nov 10 (233 days)

Zone8b

Last FrostMar 22

First FrostNov 10

Season Length233 days

Days to Harvest90

SunFull Sun

Frost ToleranceHeavy

Spacing1/sqft (12" apart)

When to Plant Rhubarb in Zone 8b

Start Seeds Indoors: Jan 11

Start Rhubarb seeds indoors around Jan 11 (10 weeks before last frost). Optimal germination temperature: 65°F. Germinates in 7–21 days.

Transplant Outdoors: Feb 22

Transplant Rhubarb seedlings outdoors after Feb 22. Wait until soil temperature reaches 40°F. Space plants at 1/sqft (12" apart). Harden off plants for a week before moving outside.

Harvest: Feb 22

First harvest approximately Feb 22 (~365 days from transplant). Continue harvesting until first frost (Nov 10). 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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