When to Plant Kohlrabi

Kohlrabi seedlings

Kohlrabi is a cool-season crop. Sow seeds in the garden 4 to 6 weeks before the last frost. Sow seeds indoors for transplanting out 6 to 8 weeks before setting them in the garden.

Set kohlrabi transplants in the garden 5 weeks before to 2 weeks after the last frost. Make succession plantings every two weeks until mid-June.

Kohlrabi matures in 50 to 70 days after seeds are sown. Harvest kohlrabi while still small, no more than 2 to 3 inches (5-8cm) in diameter. Slice through the stem 1 inch below the bulb.

Kohlrabi prefers humus-rich soil and full sun, but kohlrabi can tolerate partial shade. Kohlrabi is a heavy feeder that needs high amounts of potassium for best growth.

Time late summer planting so that kohlrabi is touched by frost before harvest in autumn; frost will sweeten the flavor of kohlrabi.

Kohlrabi seedlings in the greenhouse.

Kohlrabi seed sowing dates

(These dates are for the Northern Hemisphere)

Average date of the last frostPlanting dates
Jan. 30Jan. 1-Feb. 1
Feb. 8Jan. 10-Feb. 1
Feb. 18Jan. 20-Feb. 10
Feb. 28Feb. 1-20
Mar. 10Feb. 10-Mar. 1
Mar. 20Feb. 20-Mar. 10
Mar. 30Mar. 1-20
Apr. 10Mar. 10-Apr. 10
Apr. 20Mar. 20-May 1
Apr. 30Apr. 1-May 10
May 10Apr. 10-May 15
May 20Apr. 20-May 10
May 30May 1-30
June 10May 15-June 1
Kohlrabi ready for harvest
Kohlrabi ready for harvest

Kohlrabi planting details

  • Sowing depth: ¼ inch (6mm)
  • Space between plant after thinning: 6-9 inches (10-23cm)
  • Days to sprout: 5-10
  • Days to harvest: 50-60
  • Storage period: 2-4 weeks
  • Seeds per 100 row feet: ½ ounce (14 grams)
  • Yield per 100 row feet: 100 pounds (45kg)
  • Varieties: Early White Vienna, Grand Duke, Purple Vienna

Related articles of interest:

How to Grow Kohlrabi

Kohlrabi Seed Starting Tips

Written by Stephen Albert

Stephen Albert is a horticulturist, master gardener, and certified nurseryman who has taught at the University of California for more than 25 years. He holds graduate degrees from the University of California and the University of Iowa. His books include Vegetable Garden Grower’s Guide, Vegetable Garden Almanac & Planner, Tomato Grower’s Answer Book, and Kitchen Garden Grower’s Guide. His Vegetable Garden Grower’s Masterclass is available online. has more than 10 million visitors each year.

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