Here's current GDU's for IL. I don't know how to find ND gdus. I'm guessing you have 0 so far.

http://www.isws.illinois.edu/warm/cropdata/cropddcalc.asp#

I see thus far in my area (NE IL), IF we had planted on 4/10 (1 week ago), we would've thus far accumulated 51 gdus, which is actually more than the 11 yr avg of 43 gdus. We're located about 7 mis from the site listed as "Stelle".