Growing Rhubarb in Zone 6a
Zone 6a has mild winters and a long growing season — good conditions for Rhubarb. Last frost: Apr 28. First frost: Oct 8.
Planting Calendar
Season: Apr 28 – Oct 8 (163 days)
When to Plant Rhubarb in Zone 6a
Start Seeds Indoors: Feb 17
Start Rhubarb seeds indoors around Feb 17 (10 weeks before last frost). Optimal germination temperature: 65°F. Germinates in 7–21 days.
Transplant Outdoors: Mar 31
Transplant Rhubarb seedlings outdoors after Mar 31. Wait until soil temperature reaches 40°F. Space plants at 1/sqft (12" apart). Harden off plants for a week before moving outside.
Harvest: Mar 31
First harvest approximately Mar 31 (~365 days from transplant). Continue harvesting until first frost (Oct 8). 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 6a?
Start Rhubarb seeds indoors around Feb 17. Transplant outdoors after Mar 31. Expect first harvest around Mar 31.
What is the last frost date for Zone 6a?
The average last spring frost date for Zone 6a is Apr 28. The first fall frost averages Oct 8, giving a 163-day growing season.
Can I grow Rhubarb in Zone 6a?
Yes. Rhubarb needs 90 days to harvest. Zone 6a has a 163-day growing season, which is sufficient.
What is the best month to plant Rhubarb in Zone 6a?
The best time to start Rhubarb in Zone 6a is Feb. Begin seeds indoors around Feb 17, then transplant outdoors after the last frost date of Apr 28.
How long does Rhubarb take to harvest?
Rhubarb takes approximately 90 days from planting to harvest. In Zone 6a, expect your first harvest around Mar 31.
Plan Your Rhubarb Garden
Track Rhubarb from seed to harvest with personalized frost dates, watering recommendations, and companion planting visualization.
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