Growing Black Radish in Zone 4a
Zone 4a has cold winters and a moderate growing season. Timing is key for Black Radish in this zone. Last frost: May 5. First frost: Oct 1.
Planting Calendar
Season: May 5 – Oct 1 (149 days) · Succession: plant every 2 weeks (up to 6x)
When to Plant Black Radish in Zone 4a
Sow Seeds Outdoors: Mar 31
Direct sow Black Radish seeds outdoors around Mar 31. Soil temperature should be at least 40°F. Space at 4/sqft (6" apart).
Harvest: May 30
First harvest approximately May 30 (~60 days from planting). Continue harvesting until first frost (Oct 1).
Fall Planting: Aug 27
For a fall harvest, plant Black Radish around Aug 27 (5 weeks before first frost).
Black 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 13bFrequently Asked Questions
When should I plant Black Radish in Zone 4a?
Direct sow Black Radish outdoors around Mar 31. Harvest around May 30.
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 Black Radish in Zone 4a?
Yes. Black Radish needs 60 days to harvest. Zone 4a has a 149-day growing season, which is sufficient. You can plant up to 6 successions.
What is the best month to plant Black Radish in Zone 4a?
The best time to plant Black Radish in Zone 4a is around Mar 31, when soil temperatures are suitable and frost risk has passed.
How long does Black Radish take to harvest?
Black Radish takes approximately 60 days from planting to harvest. In Zone 4a, expect your first harvest around May 30.
Plan Your Black Radish Garden
Track Black Radish from seed to harvest with personalized frost dates, watering recommendations, and companion planting visualization.
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