I don't have any either...granted, mine were accidental pumpkins :) The pumpkin that was sitting on our front step must have been knocked over, then buried under leaves and snow. As I was walking to my car one morning in the Spring, I noticed the large leaves growing and a large orange-ish blossom...sure enough, after clearing away some of the leaves and weeds, I saw the scattered seeds. I am keeping my fingers crossed that I'll get at least one pumpkin this year - just for the sheer satisfaction of growing one.

I think they'll be late, given what I've heard from others with gardens growing other squash and melons. It's been very cool, and a bit wet it seems...I'm sure that will delay things a bit.

I have no idea what I'm doing with my plants, for what it's worth. But I wanted to let you know you're not alone :)

Here is a link that might be useful: My Blog

I have had smaller pumpkins (around 10 lbs) go from flower to ripe pumpkin in as few as 30 days. So I would say you still have time, but they need to form soon.

In zone 5?(Hmmm)
It will depend on the variety. If it is a fast growing (big)pumpking and you got it say a week ago, you might(if you are lucky) end up having a baby pumpkin that won't be near being mature.
Pumpkins are not like zukes and cukes that you can pick and enjoy in a few days.