I have had the opportunity to experiment and grow many different varieties of pumpkins. As you may be aware, it can be difficult growing pumpkins in areas with a short growing season. Adding hail, sustained winds, early frosts, and a dry climate, will make it challenging to be successful. The following are varieties I’ve had success with:
Aspen (F1 Hybrid)–I like this Variety for the size and speed it grows. It requires little space and grows in a bush similar to a zucchini. They have been consistently around 20 pounds with a nice dark green stem. When I buy pumpkin seeds, I’ve had very good luck purchasing them from http://www.howarddill.com/seed.html
Neon-If you want to have pumpkins before the first frost, then I recommend this Variety. I have grown a few of these every year and each plant will contain 5 to 6 pumpkins. They are always ripe before the first frost and the small kids love that they can pick them up. They’re a good shape with a dark green stem. However, if you are planning to have a good face for carving, this Variety is a little small.
Howden-If you want to grow a pumpkin like you see in the stores, then choose the Howden seed. I have had really good luck with this and grown some nice 25 + pound nicely shaped pumpkins. This Variety might not ripen all the way before the first frost hits.
Atlantic Dill-The giant among all big pumpkins is the Atlantic Dill. I set my personal best record by growing a 660 pound pumpkin in 2011.