[header] How to store onions [title] Store late-season onions. [step] The onions you harvest in the spring and summer are not hardy enough to store. They should be eaten within a few weeks of harvesting. 
Plan to store onions that are harvested in the fall, since these varieties are able to last through the winter. [substeps] If you grow your own onions, plan to store onions that you plant during the spring.