When should I plant Radish in Zone 1a?

Direct sow Radish outdoors around Apr 20. Harvest around May 15.

What is the last frost date for Zone 1a?

The average last spring frost date for Zone 1a is May 25. The first fall frost averages Aug 28, giving a 95-day growing season.

Can I grow Radish in Zone 1a?

Yes. Radish needs 25 days to harvest. Zone 1a has a 95-day growing season, which is sufficient. You can plant up to 5 successions.

🥔

🥔 Growing Radish in Zone 1a

Zone 1a has harsh winters and a short growing season. Start Radish early indoors to maximize your harvest window. Last frost: May 25. First frost: Aug 28.

Planting Calendar

Outdoor

Harvest

Apr 20Aug 28

Season: May 25 – Aug 28 (95 days) · Succession: plant every 2 weeks (up to 5x)

Zone1a

Last FrostMay 25

First FrostAug 28

Season Length95 days

Days to Harvest25

SunFull Sun

Frost ToleranceLight

Spacing16/sqft (3" apart)

When to Plant Radish in Zone 1a

Sow Seeds Outdoors: Apr 20

Direct sow Radish seeds outdoors around Apr 20. Soil temperature should be at least 40°F. Space at 16/sqft (3" apart).

Harvest: May 15

First harvest approximately May 15 (~25 days from planting). Continue harvesting until first frost (Aug 28).

Fall Planting: Jul 24

For a fall harvest, plant Radish around Jul 24 (5 weeks before first frost).

Companion Planting

✅ Nasturtiums✅ Spinach ✅ Lettuce✅ Peas

❌ Hyssop

Radish 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 Radish Garden

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

Start Free Radish Growing Guide