Keeping cucumbers fresh doesn’t take too much effort, but a few tricks of the trade help keep them at their best. The only safe place for sliced cucumbers is in the refrigerator—this watery vegetable doesn’t store well otherwise, unless pickled.
The simplest method is to put the sliced cucumbers in a zip-top bag in the refrigerator. Try to eliminate as much air as possible from the bag as you seal it. The cucumbers will keep for three to four days.
To keep cucumber slices fresh for up to a week, put them in a small container and cover them with water. You can also soak a couple of paper towels in water, wrap them around the cucumber slices, and then put the bundle in a zip-top bag. This method keeps cucumbers fresh for just as long as soaking them in water.
Leaving the skin on or off won’t affect the quality or longevity of sliced cucumbers.
If you have leftover cucumber slices that you want to use but don’t necessarily want to store, add them to a pitcher of water with lemon slices or fresh mint for a refreshing beverage. This will last up to one week in the refrigerator.