When to Plant Arugula in Rapid City, South Dakota (57701)

Location

Rapid City, South Dakota

ZIP Code

57701

USDA Zone

Last Frost

Saturday, April 25, 2026

📅 Your 2026 Planting Dates

Direct Sow Outdoors

Saturday, March 28, 2026

Based on last frost Saturday, April 25, 2026 · Zone 5b

Pro tip: Sow Arugula directly outdoors 4 weeks before your last frost date.

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🌿 Plant Details

Scientific Name Eruca vesicaria subsp. sativa

Days to Maturity 40 days

Mature Height 6-12"

Spread 6"

Type Leaf

Fruit Size N/A

☀️ Growing Requirements

☀️

Sun

Partial Shade to Full Sun

💧

Water

Regular (keep moist)

↔️

Spacing

6" apart

🌱

Planting Depth

0.25" deep

Seeds typically germinate in 3-7 days

Ready to Plant Arugula in Rapid City?

Get your seeds now so they're ready by Saturday, March 28, 2026.

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🤝 Good Companions

CarrotLettuceRadishBean

🤝

Full Companion Planting Guide for Arugula

See which plants help Arugula thrive, which to keep away, and raised bed layout tips →

🛠️ Supplies You'll Need

🪵 Raised Garden Bed 🌍 Vegetable Garden Soil 🛠️ Hand Trowel Set 🚿 Watering Can

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🌾 Seed Saving Guide

🟢 Easy

✅ Open-pollinated — seeds grow true to parent

When to Harvest Seed

Let plants bolt and seed pods dry on the stalk. Harvest before pods shatter.

Processing

Cut stalks into a bag, dry, thresh to separate seeds from pods.

Seed Viability

Up to 5 years when stored cool, dark, and dry.

Pro Tip

Arugula cross-pollinates readily — isolate by 300 feet from other arugula varieties for pure seed.

🪴

Raised Bed Planting Guides

A 4×8 bed fits 4 per sq ft of Arugula. See plant counts, spacing grids, and companion pairings for every bed size →

Frequently Asked Questions

When should I plant Arugula in Rapid City, South Dakota? +

In Rapid City (Zone 5b), direct sow Arugula outdoors around Saturday, March 28, 2026.

What is the last frost date for Rapid City, South Dakota? +

The average last spring frost date for Rapid City, South Dakota (ZIP 57701) is around Saturday, April 25, 2026. This is based on NOAA climate normals for USDA Zone 5b.

How long does Arugula take to grow? +

Arugula typically matures in about 40 days from direct sowing. In Rapid City, that means you can expect harvest around Saturday, March 28, 2026 plus 40 days.

Should I start Arugula indoors or direct sow in South Dakota? +

Arugula does best when direct sown outdoors. In Rapid City, sow directly around Saturday, March 28, 2026.

📚 More Arugula Planting Guides

🗺️

Arugula in South Dakota

Zone-by-zone breakdown · Full state guide

→ 🌡️

Zone 5b Arugula Guide

All cities in your zone · Avg dates

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Growing Arugula in Zone 5b

Arugula (Eruca vesicaria subsp. sativa) is a popular garden vegetable. In Rapid City, South Dakota, which is in USDA Hardiness Zone 5b, you should direct sow seeds around Saturday, March 28, 2026.

Your average last frost date is Saturday, April 25, 2026. Arugula grows well when direct sown, as it doesn't transplant well or germinates quickly outdoors.