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
Season: Mar 22 – Nov 10 (233 days)
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 13bFrequently Asked Questions
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.
What is the best month to plant Rhubarb in Zone 8b?
The best time to start Rhubarb in Zone 8b is Jan. Begin seeds indoors around Jan 11, then transplant outdoors after the last frost date of Mar 22.
How long does Rhubarb take to harvest?
Rhubarb takes approximately 90 days from planting to harvest. In Zone 8b, expect your first harvest around Feb 22.
Plan Your Rhubarb Garden
Track Rhubarb from seed to harvest with personalized frost dates, watering recommendations, and companion planting visualization.
Start Free Rhubarb Growing Guide