When should I plant Rhubarb in Zone 5a?

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 5a?

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

Can I grow Rhubarb in Zone 5a?

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

Growing Rhubarb in Zone 5a

Zone 5a has cold winters and a moderate growing season. Timing is key for Rhubarb in this zone. Last frost: Apr 28. First frost: Oct 8.

Planting Calendar

Indoor

Outdoor

Harvest

Feb 17Oct 8

Season: Apr 28 – Oct 8 (163 days)

Zone5a

Last FrostApr 28

First FrostOct 8

Season Length163 days

Days to Harvest90

SunFull Sun

Frost ToleranceHeavy

Spacing1/sqft (12" apart)

When to Plant Rhubarb in Zone 5a

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 13b

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