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Here is the BEST Time to Start Kohlrabi Seeds in New Hampshire (2023)

Do you want to grow kohlrabi seeds in New Hampshire, but don’t know when to start them?

growing seeds

Whether growing indoors or in a garden, starting kohlrabi seeds is not as easy as it seems.

Here’s why:

  • Kohlrabi Seeds must be consistently watered, receive at least 8 hours of sunlight a day, & be kept at room temperature of at least 70 degrees Fahrenheit.

So if you don’t consistently water them they won’t germinate. If they aren’t in a room that is at least 70 degrees Fahrenheit they won’t sprout. And if it receives 8 hours of sunlight the plant itself won’t grow.

  • Because New Hampshire’s growing season is not long enough, kohlrabi seeds cannot be sowed outside and should only be started indoors.

Because of this, I’m going to teach you the ideal time to start kohlrabi seeds indoors in New Hampshire:

  • To Learn More About HOW to Grow Kohlrabi, Check Out This GUIDE!


When to Start Kohlrabi Seeds Indoors

Depending on the type of kohlrabi, it takes roughly 40-60 days (6 to 8 weeks) to grow kohlrabi from seed indoors before you can transplant them into your garden.

The approximate date of when you should start your kohlrabi seeds indoors can be found by:

  • Finding the last average frost date HERE
  • And then subtract 60 days from it

You can also find the average last frost date for most major cities in the below chart that I have created:

new hampshire frost dates

To help ensure the greatest success of your kohlrabi seeds germinating you should:

  • Use a heat mat to ensure the gardening pot remains at 70 degrees Fahrenheit
  • Use a grow light to control how much light your kohlrabi seeds receive
  • Water your seeds with a spray bottle to ensure your seeds are not overwatered

Once your seedlings are ready, you can read how to transplant your plant HERE.

It should also be noted that you will not want to introduce your kohlrabi plants into your garden until 2 weeks after your last frost or else your plant will potentially die or not bear vegetables.

If you want to learn WHEN to start ANY Vegetable Seed in New Hampshire, head over to HERE and just type in the vegetable you want to grow.

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