When should I plant Rhubarb in Zone 5b?

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 5b?

The average last spring frost date for Zone 5b is Apr 28. The first fall frost averages Oct 8, giving a 163-day growing season.

Can I grow Rhubarb in Zone 5b?

Yes. Rhubarb needs 90 days to harvest. Zone 5b has a 163-day growing season, which is sufficient.

Growing Rhubarb in Zone 5b

Zone 5b has cold winters and a moderate growing season. Timing is key for Rhubarb in this zone. Darrera gelada: Apr 28. Primera gelada: Oct 8.

Planting Calendar

Indoor

Outdoor

Harvest

Feb 17Oct 8

Season: Apr 28 – Oct 8 (163 dies)

Zona5b

Darrera geladaApr 28

Primera geladaOct 8

Temporada163 dies

Collita90 dies

SolSol Ple

When to Plant Rhubarb in Zone 5b

Start Seeds Indoors: Feb 17

Start Rhubarb seeds indoors around Feb 17 (10 setmanes abans de l’última gelada). Optimal germination temperature: 65F. Germinates in 7-21 days.

Transplant Outdoors: Mar 31

Transplant Rhubarb seedlings outdoors after Mar 31. Wait until soil temperature reaches 40F. Space plants at 1/m² (30cm espaiat). Harden off plants for a week before moving outside.

Harvest: Mar 31

First harvest approximately Mar 31 (~365 dies 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 13b

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