How to Harvest, Cure, and Store Onions for Months
By Ada Jones · Updated October 2026 · 8 min read
Short answer: harvest onions when 50-80% of the tops have fallen over on their own, cure them somewhere warm, dry, and airy for 2-4 weeks until the necks are fully dry and papery, then store the cured bulbs somewhere cool, dark, and dry. Skipping curing is the single biggest reason home-grown onions rot in storage within weeks instead of lasting months.
When to Harvest: Reading the Signs
| Sign | What It Means |
|---|---|
| Tops yellowing and falling over on their own (not pushed down) | Bulb has stopped growing — ready within days to a couple of weeks |
| 50-80% of the row has fallen over | The ideal harvest window for most of the bed |
| Neck still thick and green, tops upright | Not ready — let them keep growing |
| Tops fully dry and brown, bulb skin papery | Past ideal window but still harvestable; cure promptly |
Don’t bend or stomp the tops down to force early maturity — this is an old trick that actually opens the neck to rot organisms and shortens storage life rather than extending it. Let the tops fall naturally.
How to Harvest Without Damaging the Bulbs
- Choose a dry day; harvesting wet onions invites rot during curing
- Loosen the soil with a garden fork a few inches from the row — don’t pull straight up, which can tear the roots and bruise the bulb
- Lift the bulbs out gently and brush off loose soil without washing them
- Lay them out of direct intense sun (which can scald exposed bulbs) in a single layer to begin drying
Curing: The Step Most Beginners Skip
Curing dries the outer skins and seals the neck, which is what actually gives onions their multi-month shelf life. Spread or hang bulbs somewhere warm (75-85°F / 24-29°C), dry, and well-ventilated, out of direct rain, for 2-4 weeks. A garage, covered porch, or shed with a fan works well; humid or still air slows curing and raises rot risk.
Meg Cowden of Seed to Fork reports curing her onion harvest for 3-6 weeks depending on the season, and still loses roughly 10% to rot by late winter even with careful curing — a reminder that some loss is normal even when curing is done right.
Onions are cured and ready to store when the neck is tight and papery-dry (not soft or green) and the outer skins rustle. At that point, trim the roots close and cut the tops to about an inch, or braid them if you plan to hang-store.
Storing Cured Onions
| Storage Method | Best For | Expected Shelf Life |
|---|---|---|
| Mesh bags or old pantyhose, hung in a cool dry spot | Pungent, long-storing varieties (yellow storage onions) | 4-8 months at 35-45°F (2-7°C) |
| Braided and hung | Soft-necked varieties with flexible tops | 3-6 months |
| Single layer in a shallow box or crate | Any variety, smaller harvests | 2-4 months depending on variety |
| Refrigerator crisper drawer | Sweet/mild varieties, which store poorly at room temp | 4-6 weeks |
Sweet onion varieties (higher water, lower sulfur content) don’t store nearly as long as pungent storage varieties — plan to eat those first. Never store onions near potatoes; potatoes release moisture and gases that speed onion spoilage.
FAQ
Can I skip curing and store onions right away?
You can, but expect them to spoil within a few weeks instead of months — the uncured neck and skin let in moisture and rot organisms.
Why are some of my stored onions going soft?
Usually incomplete curing, storage that’s too warm or humid, or a bulb that had a thick neck (bull-necked) and never sealed properly. Sort through stored onions every couple of weeks and use any softening ones first.
Can I freeze onions instead of curing and storing them?
Yes — chopped raw onion freezes well for cooking use, which is a good option for sweet varieties that won’t keep long at room temperature.
Final Thoughts
Curing is the step that determines whether your harvest lasts weeks or months — don’t rush it. Once bulbs are cured and sorted, check our guide on onion growth timelines to plan next season’s planting date around your ideal harvest window.
How This Guide Was Checked
Based on university extension storage-crop guidance and grower-reported curing results, including Meg Cowden’s (Seed to Fork) published onion harvest data. Questions about your own harvest? Contact us.
Related Onion-Growing Guides
- Onion Harvest Date Calculator: Estimate by Planting Date
- Common Onion Pests and Diseases (and How to Control Them)
- How Long Does It Take to Grow Onions? A Timeline by Method
See the full How to Grow Onions guide for the complete seed-to-harvest walkthrough.