Below which temperature range can grapevines be severely damaged or die?

• A. -5C
• B. -30C
• C. -15C to -25C
• D. -40C

Answer: (C)

Grape vines have a limit to how cold they can endure when they’re dormant, and the most frost-sensitive tissue is the buds. Severe damage or death is most likely when temperatures drop into roughly -15°C to -25°C. In this range, buds and young wood can be damaged as ice forms inside cells and disrupts membranes, which can reduce bud break or kill the buds entirely. Warmer temperatures, like -5°C, are usually not lethal if the vines are properly hardened, while much colder conditions such as -30°C or -40°C would cause more extensive damage if exposure is prolonged. The exact outcome depends on factors like the cultivar, how well the vine has acclimated for winter, and how long the cold lasts.