Water the Plants
Pumpkins require a lot of water — about 1" per week. You will need to keep the soil evenly moist, but you want to keep water off of the leaves so be sure not to use an overhead sprinkler for irrigation. Use a garden hose equipped with a misting nozzle to lightly water the mounds.
Try to apply water to your plants early in the morning so excess moisture will not be left on leaves. Excess moisture can promote disease and pest problems. Watering should be slow and deep for pumpkins and squash. You want to moisten the soil down at least 6". Push your index finger down into the soil to check the depth of the moisture.
To increase the growing temperatures or protect the squash and pumpkins against pests when the plants are small, you can add lightweight row covers. They let light and water in, but keep the insects out. You can leave it over plants all summer, but be sure to remove the covers when plants begin to bloom so the blooms can be pollinated.