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🥗 Growing Arugula in Zone 4a

Zone 4a has cold winters and a moderate growing season. Timing is key for Arugula in this zone. Last frost: May 5. First frost: Oct 1.

Planting Calendar

Indoor

Outdoor

Harvest

Apr 7Oct 1

Season: May 5 – Oct 1 (149 days) · Succession: plant every 2 weeks (up to 8x)

Zone4a

Last FrostMay 5

First FrostOct 1

Season Length149 days

Days to Harvest35

SunPart Sun / Part Shade

Frost ToleranceModerate

Spacing4/sqft (6" apart)

When to Plant Arugula in Zone 4a

Start Seeds Indoors: Apr 7

Start Arugula seeds indoors around Apr 7 (4 weeks before last frost). Optimal germination temperature: 65°F. Germinates in 3–7 days.

Transplant Outdoors: Apr 21

Transplant Arugula seedlings outdoors after Apr 21. Wait until soil temperature reaches 40°F. Space plants at 4/sqft (6" apart). Harden off plants for a week before moving outside.

Harvest: May 26

First harvest approximately May 26 (~35 days from planting). Continue harvesting until first frost (Oct 1).

Fall Planting: Aug 27

For a fall harvest, plant Arugula around Aug 27 (5 weeks before first frost).

Companion Planting

✅ Beans✅ Onions✅ Potatoes✅ Lettuce ✅ Dill✅ Beets✅ Carrots

❌ Strawberries

Arugula 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

Frequently Asked Questions

When should I plant Arugula in Zone 4a?

Start Arugula seeds indoors around Apr 7. Transplant outdoors after Apr 21. Expect first harvest around May 26.

What is the last frost date for Zone 4a?

The average last spring frost date for Zone 4a is May 5. The first fall frost averages Oct 1, giving a 149-day growing season.

Can I grow Arugula in Zone 4a?

Yes. Arugula needs 35 days to harvest. Zone 4a has a 149-day growing season, which is sufficient. You can plant up to 8 successions.

What is the best month to plant Arugula in Zone 4a?

The best time to start Arugula in Zone 4a is Apr. Begin seeds indoors around Apr 7, then transplant outdoors after the last frost date of May 5.

What companion plants grow well with Arugula?

Good companion plants for Arugula include Beans, Onions, Potatoes, Lettuce, Dill, Beets. Avoid planting Arugula near Strawberries.

How long does Arugula take to harvest?

Arugula takes approximately 35 days from planting to harvest. In Zone 4a, expect your first harvest around May 26.

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