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Here is the BEST Time to Start Rosemary Seeds in Ohio! (2022)

Do you want to grow rosemary seeds in Ohio, but don’t know when to start them?

Starting rosemary seeds is not as easy as it seems.

Here’s why:

  • Rosemary Seeds must be consistenly 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 Ohio’s growing season is not long enough, rosemary 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 rosemary seeds indoors in Ohio:

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


When to Start Rosemary Seeds Indoors

Depending on the type of rosemary, it takes roughly 72 – 168 days (12 – 36 weeks) to grow rosemary from seed indoors before you can transplant them into your garden.

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

  • Finding the last average frost date HERE
  • And then subtract 168 days from it

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

Ohio Frost Dates

To help ensure the greatest success of your rosemary 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 rosemary seeds receive
  • Water your seeds with a spray bottle to ensure your seeds are not overwatered

It should also be noted that you will not want to introduce your rosemary 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 Herb Seed in Ohio, head over to HERE and just type in the herb you want to grow.

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