Ask Mr. Smarty Plants

I expect that many of the wildflowers/forbs you have in mind naturally germinate in the fall and grow slowly during the winter as rosettes. They are then poised with good roots and leaves for the warm growing season of the next spring. If some that you might plant now do germinate in late spring or summer they would lack the resources to bloom this year and might have trouble surviving the hot summer with possibly irregular railnfall. Mr. Smarty Plants likes to let nature take its course, meaning in this case following the normal course of seed ripening, dropping to the ground in due course, and most likely germinating with the fall rains.

The problem is one of inconvenience - having to plant grass seed and coming back later for the wildflower seeds. It will be important to have the wildflower seeds make contact with the mineral soil, but your young grass plants should not greatly decrease the chances of that happening, especially if you roll again.

I feel that you will have a much greater survival rate of your wildflowers/forbs if you delay planting their seeds until fall. I see no advantage in waiting until January. You should then have a beautiful visa of color in the spring.