Today's high was about 54 degrees and the over night lows for the next two nights will be in the low 30s. This is pumpkin killing weather. Pumpkin plants don't like frost in the least and when there is frost your season is done. More than likely your pumpkin will survive the frost okay but there is a risk of splits. The leaves however are another story.
In an attempt to keep the kids' pumpkin plant growing I've covered the small plant with clear plastic and then put two light bulbs in with the plant to add a little heat to the space. I don't know if it will work or not but I figured it was worth the 15 minutes to set it up and give it a try.
The best way to protect the plant late in the season is the way Pete did it with remay wrapped around a wood structure (see picture in previous post). It costs a little but it adds warmth and frost protection late in the season to keep the pumpkin growing a couple of extra weeks.