When can I plant radish outside?

Direct sow or transplant 4 weeks before your last spring frost.

How long until radish is ready to harvest?

21-30 days. Shoulders visible above soil at 1 inch diameter; pull promptly as they become pithy and hot if left too long

Lawn Guardian

When to Plant Radish

Raphanus sativus

root_vegetableZones 2–10beginner

The fastest vegetable from seed to table -- some varieties mature in just 3 weeks. Perfect for impatient gardeners and kids. Use as row markers for slower crops.

Planting calendar

Direct sow / transplant

4 weeks before your last spring frost.

Fall planting

4 weeks before your first fall frost.

Fastest vegetable; succession plant every week for continuous harvest; prefer cool weather

Spacing & harvest

Plant spacing: 1-2 inches
Row spacing: 6-12 inches
Days to harvest: 21-30 days
Ready when: Shoulders visible above soil at 1 inch diameter; pull promptly as they become pithy and hot if left too long

Companion planting

Plant near

Cucumber — Repels cucumber beetles
Pickling Cucumber — Repels cucumber beetles
Zucchini — Deters squash vine borers
Butternut Squash — Deters squash bugs
Spinach — Fast radishes mature before spinach needs space
Lettuce (Butterhead) — Fast radishes mark rows before slow lettuce appears
Romaine Lettuce — Quick-growing radishes mark rows and break soil
Endive — Quick-growing radishes mark rows and loosen soil
Mesclun Mix — Quick-growing companions that mark rows

Get radish planting dates for your exact zone

Lawn Guardian turns this guidance into a schedule timed to your USDA zone and this week's actual weather — and adapts every time you log what you've done.

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Sources: Purdue University Turfgrass Science: Use Growing Degree Days to Better Time Your Applications · University of Missouri Extension: Cool-Season Grasses: Lawn Maintenance Calendar · University of Minnesota Extension: Pre-emergent Herbicides for Crabgrass Control in Lawns