How long does it take for serrano peppers to turn red?
If left to fully mature beyond 60-70 days, serrano peppers will turn from green to red. Some varieties will go through shades of purple, orange, yellow, or brown but most varieties change from green to red.
Do serrano peppers get hotter when they turn red?
On the Scoville scale, Serrano peppers have 10,000 to 20,000 SHU. ... Serranos will vary in heat depending on their size—the smaller the pepper the stronger the burning sensation. A green, unripe serrano will also be milder in taste than a ripened red serrano.