The question is, how soon should I mow? In the past, I've always waited too long to mow new grass, but I know better now. tiemco recommends mowing the new TTTF when it reaches 3 in, and mowing it back to 2 in. But the KBG likely won't have germinated by this time. I don't want to suck up the seeds and displace them (using a rotary mowever).

And what about starter fertilizer? What is the absolute longest I can wait so as not to compromise the grass?

Finally, won't the foot/mower/spreader traffic hurt the seedlings?

You can put down starter fertilizer at any time. It won't hurt the grass. I usually put it down with the seed. The only thing about fertilizer you need to be concerned with is not to put down fertilizer that has weed control. Depending on the particular weed control, it will either prevent the seeds from germinating or harm the young grass.

It's a good idea to lightly cover the seed with dirt, top soil or compost. It helps keep the seed wet and helps keep the seeds in place.

Now, which grass, TTTF, or TTPR, has more of a chance of clumping? I've heard this about both of them, and I've witnessed it with PR that has partially died off during hot summers, but I've never really had much TF until the most recent (in progress) seeding project. i've heard that TF often clumps when it thins out, but it's not any mroe clumpy than PR, is it? If anything, I'd think it would be less clumps since it has rhizomes.