Zone 4 · Leafy Greens Growing Guide

When to Plant Arugula
in Zone 4

One of the fastest crops you can grow — baby leaves in 21 days. Peppery flavour intensifies with heat and age. Bolts to seed quickly in warm weather — treat as a cool-season cut-and-come-again.

Plant outdoors
Apr 5 – Jun 1, Aug 5 – Sep 5
Start indoors
Direct sow
Last Frost
~May 1
Days to harvest
21–40 days
Difficulty
Easy
Plant now — Zone 4
Harvest window: Apr – Jun, Sep – Oct

Planting Calendar

In Zone 4, Arugula should be planted outdoors Apr 5 – Jun 1, Aug 5 – Sep 5, after the average last frost date of approximately May 1.

Spring and fall crops. Successive sowings every 2 weeks give steady supply.

Care Guide

Sunlight
Full sun to partial shade · 3–8 hrs/day
Watering
Regular
Spacing
4–6 inches
Soil
Well-draining, moderate fertility
Days to maturity
21–40 days
Soil pH
6.0–7.0
plant tip · Zone 4

Spring and fall crops. Successive sowings every 2 weeks give steady supply.

Feeding Schedule

How often
once a season
Feed type
balanced (10-10-10)
Key timing
at planting

Light feeder. A single application of balanced fertilizer at planting is enough. Over-feeding reduces the peppery flavour.

Succession Planting

Sow every 2 weeks

Sow every 2–3 weeks throughout spring and again from late summer. The fastest succession crop in the garden — ready in 3 weeks. Keep sowing and you'll rarely be without it.

Companion Planting for Arugula

What you plant next to arugula makes a real difference — some plants actively help, others compete or attract pests.

Grows well with
  • Lettuce
  • Brassicas
  • Bush beans
Keep away from
  • Fennel
  • Nightshades

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Common questions

In Zone 4, arugula has two planting windows: Apr 5 – Jun 1, Aug 5 – Sep 5. The spring window opens after your last frost around May 1. The fall window lets you grow a second crop before first frost around Oct 1. Spring and fall crops. Successive sowings every 2 weeks give steady supply.
Zone 4 has an average last spring frost of approximately May 1 and a first fall frost around Oct 1. These dates vary by specific location — use your ZIP code in the plant app for precision based on the nearest NOAA weather station.
Good companion crops for arugula include Lettuce, Brassicas, Bush beans. Avoid planting near Fennel, Nightshades, which can compete for nutrients or attract pests.
Arugula typically takes 21–40 days from transplant or direct sow to harvest in Zone 4. Expected harvest window: Apr – Jun, Sep – Oct.

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Arugula in other zones
Crop Guides