Home » Blog » Harvesting, Curing, and Storing Onions

Harvesting, Curing, and Storing Onions

This post may contain affiliate links, which means that I may receive a commission if you make a purchase using these links. As an Amazon Associate I earn from qualifying purchases.

Storage onions are a variety of onions that will last in a cool location through the winter months. Learn which varieties to grow for food storage, plus tips on harvesting, curing, and storing onions for winter food storage.

freshly harvested onions layered on a table

I grow several varieties of onions each year including quick maturing scallions and other varieties fresh eating.

However, the majority of onions that I grow are storing onions meant to last through the winter months until the next growing season. Store onions add delicious flavor to winter soups, bone broths, chili, stews, and roasts.

How to Choose Onions to Grow for Food Storage

When choosing onions to grow for winter storing, select varieties that are known for their long-term storage capabilities.

Onions are also categorized as “short-day” onions or “long-day” onions. Long-day onions are what we grow in northern US plant hardiness Zones 6 and cooler. These are triggered to bulb when sunlight increases to 14-16 hours.

Copra, Stuttgarter, and Redwing are my staple onions for long term storing over winter. These varieties work wonderfully for winter soups, chili, stews, and roasts.

Onions are the first seeds sown for the approaching growing season. The seeds are planted in January or February under grow lights, so they have plenty of time to grow before forming bulbs.

Onions can also be planted from transplants or onion sets purchased online or at your local garden center. Here in the north, onion seedlings or onion sets are planted in the garden in early spring, usually in April and grow all summer long.

closeup of an onion growing in the garden

Did you know that each hollow, green leaf represents a ring in the onion? Strong, healthy foliage growth before the bulbs form results in larger onions when mature and ready for harvesting.

When to Harvest Onions

Onions can be harvested at any time for fresh eating, but allow storing onions to mature fully to ensure the greatest storage capability.

Onions will let you know when they are finished growing. You will start to see the tops flop over. The onions will bend over at the stem and stop directing energy to the foliage.

onions in the garden

There will be one or two plants at first. Eventually, the rest will follow. Depending on the variety, this usually happens in the first few weeks of August in my Maine garden.

Once the tops fall over, the onions are ready to harvest. Stop watering and wait for a dry period to dig up the bulbs.

How to Harvest Onions

Once you have determined that your onions are finished growing, it is time to harvest them. Choose an overcast day to reduce the sun damaging the bulbs as you work.

The easiest way to harvest a large amount of onions is to use a digging fork to carefully loosen the soil under the onions.

Once the soil is loose, grasp around the neck of the onion stalk and pull them up gently trying not to tear the roots, stalks, or bruise the bulbs because damage will reduce the onion’s storage life.

If the sky remains cloudy, I like to spread out the onions on my garden fence so any soil that is still clinging to the bulbs can dry and be shaken of before bringing the onions inside to cure. If the sun is out, spread the onions out in a dry, shady area out of direct sun.

freshly harvested onions hanging over a wire fence

Curing Onions

Curing onions allows the outer layers to dry out and tighten forming a protective wrapping around the bulb.

Onions cure best in a shaded, dry, and cool place. This can be in a shed or on a covered porch away from direct sunlight.

Spread the onions out or hang them so air can circulate around the bulbs and dry evenly. Our summers are humid, so I usually bring the onions inside and space them out on wire shelves in the basement where we run a dehumidifier to keep the moisture levels down.

red and yellow onions hanging to dry

Curing can take several weeks to a month depending on the humidity level. Onions are finished curing when their outer skins turn papery, the foliage at the neck constructs, and the foliage shrivels and turns brown.

Test one by cutting the stem about an inch from the bulb. The center of the cut area should not show any green. If it does, then the onions have not cured completely. Allow an additional week.

How to Store Onions

Once the onions are fully cured and all the foliage is dry and crispy, I like to take the bundles back outside for cleaning and trimming before storing.

Use scissors and cut the stems cleanly an inch or two from the bulbs and trim the roots. Brush the bulbs gently with your fingers to release any additional soil still clinging to the papery skin. Sometimes, the outer layer falls off. This is ok, but I try not to damage the skins any further than the first layer.

yellow onions stored in a basket

Inspect the trimmed onions are carefully. Any blemishes, bruising, or damage to the onions will affect their storage potential. Set these aside and use first.

Store cured onions loosely in baskets or hung in mesh bags in a cool, dark, and dry location for winter. Ideal storage temperatures are around 35-40˚F. Different onion varieties and storage conditions will affect how long they last.

Copra and Stuttgarter usually last the longest for me and usually begin to get soft or sprout around April. Check the onions every few weeks and remove any that develop soft areas or show signs of sprouting.

Trim off any bad areas and use the onion right away, freeze for later, or dehydrate into onion flakes and onion powder.

You May Also Like:

Good planning is key to a successful vegetable garden

Whether you are new to growing your own food or have been growing a vegetable garden for years, you will benefit from some planning each year. You will find everything you need to organize and plan your vegetable garden in my PDF eBook, Grow a Good Life Guide to Planning Your Vegetable Garden.

Grow a Good Life Guide to Planning Your Vegetable Garden

Storage onions are a variety of onions that will last when stored in a cool location through the winter months. Learn which varieties to grow for food storage, plus tips on harvesting, curing, and storing onions for winter food storage.

Learn when to harvest and how to cure storing onions to provide delicious flavor to winter soups, bone broths, chili, stews, and roasts.


  1. I just harvested an onion which has no skin on one side and the side of the onion is exposed. Should I still cure it for a few weeks or eat it right away?

  2. Are the stocks or stems any good to preserve if cut off the onion at the early stages harvesting. Someone brought me up some green stocks/stems and I’m wondering what to do with then

  3. I cut the stems off before reading this great article! There is still about two inches of the stems on my onions. Will they still cure?

    1. Shari, It is good that you left a few inches. This should be enough to prevent onions from loosing moisture as they cure. Cure the onions in a dry, cool location and spread them out so the air can circulate around them.

  4. I’m new to growing onions and I’m excited to harvest my first onion this spring. Do they have to cure or can I eat them fresh out of the ground (after they’re cleaned. Lol)

  5. I bought some strawberry onions at the festival, and asked the seller how to store and save them! I now know that he told me wrong! He said to cut the green tops off. And let the onion skin dry out! Are the onions ruined? I bought 9 larg, and will not be able to use them fast..can I save them or toss away the $ I spent?

    1. Patty, I don’t think strawberry onions are storage onions, but they should stay good for a while in a cool location. If the onions start getting soft, you can chop and freeze them so they last longer.

    1. Becky, Yes, you can try to store the smaller onion and plant next year. I never have any luck trying to store small onion sets for next year. They end up shriveling up in storage. Give it a try and let me know how you make out.

    1. Elane, Yes, you can eat onions that have sprouted. The bulbs do begin to get soft once they sprout and the flavor will be pretty strong. If the onion is moldy though, throw it away.

Leave a Reply

Your email address will not be published. Required fields are marked *