Zone 10 · Root Vegetables Growing Guide

When to Plant Radish
in Zone 10

The fastest crop in the garden — ready in 22 days. Use radishes to mark slow-germinating carrot rows. Sow a pinch every week from early spring to early summer, then again in fall.

Plant outdoors
Oct 1 – Feb 1
Start indoors
Direct sow
Last Frost
~Jan 15
Days to harvest
22–30 days
Difficulty
Easy
Late season — Zone 10
Harvest window: Oct – Mar

Planting Calendar

In Zone 10, Radish should be planted outdoors Oct 1 – Feb 1, after the average last frost date of approximately Jan 15.

Cool season crop. Brief but prolific window in Zone 10.

Care Guide

Sunlight
Full sun to partial shade · 4–8 hrs/day
Watering
Regular
Spacing
2–3 inches
Soil
Loose, well-draining
Days to maturity
22–30 days
Soil pH
6.0–7.0
plant tip · Zone 10

Cool season crop. Brief but prolific window in Zone 10.

Feeding Schedule

How often
none needed
Feed type
none
Key timing
n/a

Fast-maturing crop that doesn't need feeding. Excess nitrogen produces leafy tops and poor root development.

Succession Planting

Sow every 1 weeks

Sow every 1–2 weeks from early spring through autumn. Radishes are the ultimate succession crop — ready in 3–4 weeks. A small row every week or two means you always have some ready without a huge surplus.

Companion Planting for Radish

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

Grows well with
  • Carrots
  • Lettuce
  • Spinach
  • Cucumbers
Keep away from
  • Hyssop
  • Fennel
  • Turnips

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Common questions

In Zone 10, radish is a fall-planted crop. Plant outdoors Oct 1 – Feb 1 once temperatures cool in autumn. It overwinters and is ready to harvest around Oct – Mar. No last frost consideration — plant before the ground freezes.
Zone 10 has an average last spring frost of approximately Jan 15 and a first fall frost around Dec 31. 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 radish include Carrots, Lettuce, Spinach, Cucumbers. Avoid planting near Hyssop, Fennel, Turnips, which can compete for nutrients or attract pests.
Radish typically takes 22–30 days from transplant or direct sow to harvest in Zone 10. Expected harvest window: Oct – Mar.

Free app · iOS February 2028

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Radish in other zones
Crop Guides