The best time to come out would be mid September, depending on how hot or dry the summer is. The hotter and dryer, the earlier the crops will start to change. In any event, you should definately, and eventually, be able to see what you want.

Highway #16 between Saskatoon and Lloydminster will be a good place to see a wheat field. You could even try Highway #40 located between North Battleford and Prince Albert, probably a little more scenic too.

Even try some of the secondary highways North and East of the Battlefords.

Hope that helps. Enjoy.