Looks like annual Ryegrass, if so, it will die on its own in the next few weeks.

Did the landscaper use a cheap "Contractors Mix" or "Quick-Cover Mix" for the seeding? Many of those mixes include Annual Ryegrass deliberately. Now you know why that can be a bad idea.

Thanks for the info. The landscaper said he used premium grass seed, though didn't see the bag. He's done a lot of work around here and I've never had an issue like this.

He first laid down 30 yards of (what he said was) premium top soil, then used starter fertilizer, then seed and covered with straw. Is it possible that the straw was contaminated with these seeds? Is annual ryegrass the same as orchard grass?

I'm concerned because he just scraped and seeded a 1/4 acre to expand my lawn which is now just germinating. I'm hoping I dont have this same stuff all over that new area too.

Is it Annual ryegrass or perennial ryegrass? He said he uses a mixture with perennial. Is there a difference in how the grass looks between perennial and annual?