Looks like a squash plant.
Do a Google Image search for castor bean. You will see the leaves of the bean are much more deeply cleft.
Hmmmm, though I believe squash only has 5 lobes on the leaves. Might be a castor bean.
Gardening at 5000 feet elevation, zone 4/5 Northern Utah, Frost free from May 25 to September 8 +/-