Pumpkin Transplant Help

I have a volunteer pumpkin coming up in a pot.  That's what you get with composting I guess.  I have read these plants do not transplant well.  It won't survive in this small pot.  I really don't have any room in any veggie gardens.  Any advice on moving this plant to hopefully get some fruit this fall?  I have no experience with pumpkins and live in Ohio.

It depends on how big the plant is in relation to the pot. Transplant as soon as possible. If it is root-bound, it may not transplant as well as it would have earlier.  I transplanted a pumpkin plant earlier in the year (we had a real late frost), and it is doing better than I could have imagined.

Do you happen to have a semi-finished compost heap sitting around? Ultimate pumpkin habitat...
I'd stand the pot in water overnight to make sure it's saturated, then invert, trying take a pot-shaped pumpkin root-ball and plant in prepared hole.
But this late in the season and if there's nowhere to plant it, I'd probably just throw it on the compost