When should I plant Kale in Zone 4a?

Start Kale seeds indoors around Mar 24. Transplant outdoors after Apr 7. Expect first harvest around May 22.

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 Kale in Zone 4a?

Yes. Kale needs 60 days to harvest. Zone 4a has a 149-day growing season, which is sufficient.

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🥬 Growing Kale in Zone 4a

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

Planting Calendar

Indoor

Outdoor

Harvest

Mar 24Oct 1

Season: May 5 – Oct 1 (149 days)

Zone4a

Last FrostMay 5

First FrostOct 1

Season Length149 days

Days to Harvest60

SunPart Sun / Part Shade

Frost ToleranceHeavy

Spacing1/sqft (12" apart)

When to Plant Kale in Zone 4a

Start Seeds Indoors: Mar 24

Start Kale seeds indoors around Mar 24 (6 weeks before last frost). Optimal germination temperature: 65°F. Germinates in 5–10 days.

Transplant Outdoors: Apr 7

Transplant Kale seedlings outdoors after Apr 7. Wait until soil temperature reaches 40°F. Space plants at 1/sqft (12" apart). Harden off plants for a week before moving outside.

Harvest: May 22

First harvest approximately May 22 (~45 days from transplant). Continue harvesting until first frost (Oct 1). Kale can overwinter in mild climates for continued harvest.

Fall Planting: Aug 6

For a fall harvest, plant Kale around Aug 6 (8 weeks before first frost).

Companion Planting

✅ Sage ✅ Dill✅ Onions✅ Beets✅ Potatoes

❌ Strawberries

Kale 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 Kale Garden

Track Kale from seed to harvest with personalized frost dates, watering recommendations, and companion planting visualization.

Start Free Kale Growing Guide