When to Plant Rhubarb in Boise, Idaho (83708)

Location

Boise, Idaho

ZIP Code

83708

USDA Zone

Last Frost

Friday, April 10, 2026

📅 Your 2026 Planting Dates

Start Seeds Indoors

Friday, February 13, 2026

Transplant Outdoors

Friday, April 24, 2026

Based on last frost Friday, April 10, 2026 · Zone 7a

Pro tip: Start Rhubarb seeds indoors 8 weeks before your last frost date, then transplant outdoors around Friday, April 24, 2026.

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🌿 Plant Details

Scientific Name Rheum rhabarbarum

Days to Maturity 365 days

☀️ Growing Requirements

☀️

Sun

Full Sun

💧

Water

Regular

Seeds typically germinate in 8-21 days

Ready to Plant Rhubarb in Boise?

Get your seeds now so they're ready by Friday, February 13, 2026.

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🛠️ Supplies You'll Need

🌱 Seed Starting Trays 🪴 Seed Starting Mix 💡 Grow Lights 🌡️ Heat Mat 🪵 Raised Garden Bed 🌍 Vegetable Garden Soil 🛠️ Hand Trowel Set 🚿 Watering Can

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🌾 Seed Saving Guide

🟡 Moderate

✅ Open-pollinated — seeds grow true to parent

When to Harvest Seed

Allow flower stalks to develop in early summer. Harvest when seeds in the large seed clusters turn brown.

Processing

Cut dried seed stalks, thresh to release seeds, winnow lightly.

Seed Viability

Up to 3 years when stored cool, dark, and dry.

Pro Tip

Rhubarb seeds don't grow true to variety. For identical plants, propagate by crown division in early spring.

Frequently Asked Questions

When should I plant Rhubarb in Boise, Idaho? +

In Boise (Zone 7a), start Rhubarb seeds indoors around Friday, February 13, 2026 and transplant outdoors around Friday, April 24, 2026.

What is the last frost date for Boise, Idaho? +

The average last spring frost date for Boise, Idaho (ZIP 83708) is around Friday, April 10, 2026. This is based on NOAA climate normals for USDA Zone 7a.

How long does Rhubarb take to grow? +

Rhubarb typically matures in about 365 days from transplanting. In Boise, that means you can expect harvest around Friday, April 24, 2026 plus 365 days.

Should I start Rhubarb indoors or direct sow in Idaho? +

Rhubarb should be started indoors 8 weeks before your last frost date. In Boise, that means starting around Friday, February 13, 2026.

📚 More Rhubarb Planting Guides

🗺️

Rhubarb in Idaho

Zone-by-zone breakdown · Full state guide

→ 🌡️

Zone 7a Rhubarb Guide

All cities in your zone · Avg dates

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Growing Rhubarb in Zone 7a

Rhubarb (Rheum rhabarbarum) is a popular garden vegetable. In Boise, Idaho, which is in USDA Hardiness Zone 7a, you should start seeds indoors around Friday, February 13, 2026.

Your average last frost date is Friday, April 10, 2026. Plan to transplant your Rhubarb seedlings outdoors around Friday, April 24, 2026, about 2 weeks after your last frost date.