Knowing how to store cucumber is important if you want to enjoy the fruit of your harvest all winter long, or just extend the life of your cucumber by a few extra days.
How to Store Cucumber?
Before you store your cucumbers, you should know how to select the right vegetables. When picking a cucumber, be sure that it is firm all the way through, even at the ends. In terms of its visual appearance, choose a cucumber with an even and rich green color, and one that is lacking any blemishes or bruises. While many people want the biggest cucumber they can find, these will also have much larger seeds, which make them less appealing to some people. 
Once you choose a good cucumber, you can store it (whole) in the refrigerator, but don’t store it on the counter. However, if you place it in the refrigerator, it will only keep for 5 days or so before it starts to dry out and lose its firmness. If you are planning on using the vegetable quickly, then this strategy should work just fine.
To extend the freshness of your cucumber even longer, the best method is to wrap the vegetable in a damp paper towel and then place this wrapped cucumber in a plastic bag. Remove most of the air from the bag before placing it in the refrigerator.
If you want to freeze your cucumber, cut it into slices after thoroughly washing the vegetable. Bring a pot of water to boil and then drop in the cucumber for 1-2 minutes. Remove them quickly and immediately put them in a bowl of ice water for another 1-2 minutes. At this point, dry them thoroughly, and freeze them on a cookie sheet, separately, before storing them in a large freezer bag.