In February, I started growing kohlrabi under my new T5 grow lights.
I am growing three types: Purple Vienna and White Vienna from a blended seed packet from Botanical Interests. Also, I am growing Superschmelz from Territorial Seed. If you need some other kohlrabi seed ideas, just click on this link.
Since kohlrabi can tolerate cold weather down to 40°F, you can get an early start with transplanting. While I really don’t enjoy being out in the really cold weather, I typically wait until the first day of spring (March 20) to start transplanting the cool season vegetables.
Here are some options to try: Up to two months before the last spring frost, start your seedlings indoors and transplant when the temperature is consistently above 40°F. The following is what I would consider doing if I was direct sowing kohlrabi and other cool season vegetable seeds outdoors (but I’m not!): Direct sow under double cover about 2 months before, under single cover about 1 month before and without any cover about 2 weeks before the last spring frost date. Keep in mind you might have to play around with the dates a bit!
The covers help to raise the temperature and protect the seeds from frost. According to the Territorial Seed Catalog, the best temperature for seed germination is 55 to 75°F.