You left out New Jersey, which is a winner take all state, and which is a Trump win.
April primaries are:
Wisconsin (4-5)
New York (4-19)
Connecticut (4-26)
Delaware (4-26)
Pennsylvania (4-26)
Maryland (4-26)
Rhode Island (4-26)
So, yeah, Wisconsin is likely Cruz's only hope for a win in the entire month of April.