Below 5℃. By reading the detailed introduction of Bansu pumpkin in Vegetable Encyclopedia, it is found that Bansu pumpkin is a new variety of early-maturing pumpkin with small melon type. The suitable growth temperature of pumpkin is 15-25℃, and below 10℃ will seriously affect the growth and development. If the temperature is lower than 5℃, the plants will suffer from freezing injury, and the leaves will turn yellow, wither and curl. In the process of pumpkin planting, the planting time and varieties should be reasonably selected according to the local climatic conditions and seasonal characteristics, and corresponding protective measures should be taken to improve the cold resistance of pumpkin seedlings and reduce the occurrence of freezing injury.