When should I harvest cucumbers?

Question:

When should I harvest cucumbers?

Answer:

Harvest cucumbers every 2 to 3 days and promptly pick the fruits when they reach the desired size.  Pickling varieties should be harvested when the fruits are 2 to 4 inches long.  Slicing cucumbers should be 6 to 8 inches long and 1.5 to 2 inches in diameter, but still dark green and firm.  Over-mature cucumbers left on the vine inhibit additional fruit set.   

Learn more in this article: Growing Cucumbers in the Home Garden