Go ahead. If the grass is green it should benefit from an application. But if you also have to mow it--you will want to use less nitrogen--and probably slow release forms of nitrogen.
Are you licensed? If so you would want to apply crabgrass control, and weed control will be coming up soon, dandelions normally come up about the week of the first or second mowing--unfortunately you need crabgrass control about the same week.
Same conditions here, in Michigan and much of the upper midwest and east.
I have been searching the park and local bad lawns for signs of crabgrass sprouts--so far not sure--but I do see a lot of knotweed sprouting. Frost expected tonight, 29 degrees.