To tell if onions are ready to harvest, look for the following signs:
1. The leaves of the onion plant will begin to turn yellow and fall over.
2. The onion bulb will be firm to the touch and will have a papery skin.
3. The stem of the onion plant will be dry and woody.
If you see these signs, it means that your onions are ready to harvest! Cut them from the ground, being careful not to damage the bulbs, and then store them in a cool, dark place until you’re ready to use them.