When Can I Plant and Harvest My Onions?

If you haven’t tried growing onions yet, you might want to know when you should begin your journey in planting these pungent bulbs and of course, when you can harvest them.


A good number of people say it is best to plant sets early – as early as 10 weeks before frost.  On the other hand, some say it should be five weeks.  To be on the safe side, plant your onion sets somewhere in between – about seven to eight weeks before frost.

Remember, timing also plays a role when the onions form bulbs – plant your onions too late in the season and they might not form bulbs properly, if they form at all.

Transplants should be set out about four to six weeks before the date of the last average spring freeze.

If you are using seeds, sow them indoors approximately 10 weeks about 10 weeks prior to the last frost date.  Six to eight weeks after they have germinated, you can transplant them outdoors.


Harvesting onions is relative to what you are going to use it for.  If you intend to use the greens, you can harvest them as soon as the foliage reach a height of about six inches.

Since mature onion bulbs grow under the soil, you might think it’s difficult to know when it’s time to harvest them.  It’s really not – if you know what to look for.

When you see the foliage turns brown and falls over, it’s almost time to pick.  But if you would like to store onions for later use, you would have to wait a little while longer.  Once you see the tips fall over, bend the rest of the onion plants carefully and let them stay like that for a couple of more days.

After that, you can pull them out of the ground and cure them until their outer skin dries out.  Store the onions in a cool, dry place.


One Response to “When Can I Plant and Harvest My Onions?”

  1. Vivienne says:

    Hi, I have grown oions this year and they seem to be doing well, however one of the onions has a bulbous like seed pod on top of one of the stalks, can you tell me what this is please and what to do with it.

    Many thanks