The Bluegrass does not do well in your climate for some reason, it is best to stick with Perennial Ryegrass or if you want a thicker bladed grass, then use Fescue (turf types only)

You can mix both if you want, I don't recommended because of the different texture. Just get a 3-way blend of Perennial Ryegrass, that's what grows best and looks best in your neck of the woods.

Do you think if I overseed and fill in the open spaces with Perennial Ryegrass the color and growth rate will be compatible with what's in the Pennington Ultimate Seeded lawn I have? Thanks!

NTEP.

What does NTEP mean?

I disagree with Auteck's recommendation, and I'm a little surprised he recommended what he did. Your original grass seed mix selection was tall fescue, fine fescues and KBG. I suspect you have mostly tall fescue growing since you have bare spots. If the KBG in your original grass mix had germinated fully, then it should fill in bare areas in the sunnier parts of your lawn. I agree with him in that perennial rye is usually what is grown in your area, but there was no perennial rye in that original mix. Overseeding your lawn with it now will give you some throughout the whole lawn, but the bare spots will be all PR, and they will stand out against the TF you have now. My advice, use either all TF to overseed, or a mix that has similar percentages to your original mix. I would also stick with Pennington's as it is usually the best mix in the big box stores.

What I don't like about the KBG and Fescue mix is when you walk the lawn you can see pretty big patches (e.g., 2' diameter) where it's all KBG, other parts that are all Fescue, it keeps changing all over the lawn. From a distance the lawn looks pretty good but I really dislike the differences as you walk on the lawn, the KGB looks like a horizontal spreader that you can tell it's horizontal spreading vs. the fescue stands straight up.

Need to overseed again this spring. Any further recommendations? Walmart has Scotts Commercial Grade Mix all tall fescue 4 types of it nothing else in it - thoughts?