Preserving cucumbers is not much work. Cucumbers are relatively sturdy fruits that can withstand a few days on your pantry without rotting. But for extra preservation, nothing works like a refrigerator. This is the easiest, fastest, and most effective way to keep a cucumber edible for a month. If you want more time than that, consider pickling or canning. Pouring skinless cucumbers into vinegar or brine can last up to two years.