I LOVE decorating for Halloween and my favorite part is all the heirloom pumpkins/squash available nowadays. Trader Joe's is a great source, but many other grocery store chains now offer them. I much prefer the colors and textures of the heirloom like white, blue, and peach. I think they are gorgeous and traditional orange pumpkins are not my thing.
I raised the issue yesterday of pumpkins lasting in my new hot tropical climate. I am talking here uncarved pumpkins. I used to display mine through Thanksgiving in NOVA.
I learned a couple tricks I intend to try to extend their life. These techniques work anywhere - pumpkins do not like cold, heat, or rain.
First, clean your pumpkin with diluted bleach or a bleach disinfectant wipe to kill mold and bacteria.
Second, coat the pumpkin with acrylic, paste wax, WD-40, or Vaseline. Those decorative gourds they sell, for example, are coated with varnish and last for years.
These techniques should extend the life of your pumpkins even in hot climates.