I planted pumpkins (4 plants) with my grandson. We have 2 good sized pumpkins but they are still yellow. Will the cool nights in Connecticut harm them? If I harvest them, will they still turn orange or will they stay yellow? I plan to let the rest of the developing pumpkins grow on the vines. There are about ten still growing. I think that I planted them too late in the spring. We had a very cool and rainy spring and early summer. A lot of my flower gardens did not do well this season.