minimum temperature for greenhouse tomatoes
In the summer when temperatures soar over 90 degrees F. (32 C.) with nights over 76 degrees F. (24 C.), again, the tomato plant will suffer damage to immature fruit or loss of flowers.dvertisement. The growing temp for tomato seedlings should be maintained at constant temps of between 58-60 degrees F. (14-16 C.), whether starting in the greenhouse or indoors, and then not transplanted until the last frost has passed.