It looks as though grain sorghum will grow and produce satisfactorily in some parts of the state- particularly in the southern and western parts. But it may not do as well as corn in the male corn-producing areas.
Kalton, R. R.; Grissom, D. B.; and Dyas, E. S.
"Grain Sorghum - A Coming Crop in Iowa?,"
Iowa Farm Science: Vol. 10
, Article 5.
Available at: https://lib.dr.iastate.edu/farmscience/vol10/iss8/5