This "grass" was not in our yard last year. This year it is spreading.

I'm thinking it a sort of monkey grass.
We're in North Texas, just a couple of block from Lake Granbury.

Any chance you have rain lilies? (Zephyranthes atamasca)

Otherwise... on looking closer... possible annual rye.

My, my: I thought that looking at all the variations of monkey grass boggled my mind!

When other plant leaves are involved in the picture I cannot discern whether they are part of the original plant info I was seeking or a different plan altogether.

The Rain Lily is similar but no blooms has come forth yet to suggest that is it.

Guess I need to study some more.

Thanks for the suggestion!

The leaves don't look succulent to me, and if that is correct, it would rule out rain lily. It also doesn't look like any of the grasses commonly called Monkey Grass (various Liriope sp. & Ophiogon sp.), tho, that's the danger in using common names: completely different and unrelated plants may have the same common name depending on where you live. I think those species generally have a little more substance/thickness to their leaves (tho not quite succulent), while the grass pictured appears to be really thin (not in width, but in cross section).

This one may be some variety of Paspalum species? Just a guess. May have to wait till you see seed heads to get a good ID.

Maybe a quack grass.

My first thought was maybe a type of Annual Rye Grass (Lolium sp.)
https://www.texasinvasives.org...
https://keyserver.lucidcentral...
https://www.texasinvasives.org...

I don't think it is Rye, but I have a similar looking annual winter grass here. It is nearly impossible to pull up but it dies when the weather heats up.

porkpal, I have that here too. It's much more exuberant than the winter rye, and almost impossible to pull. It's trying to take over my St. Augusteen lawn.

Thus far, of all the pics I've seen, Tall Fescue is one that most closely resembles it.
I will upload more diverse pics.

Thanks for all the input!