I've mowed twice now (Maryland, on top of a mountain). I work in the valley, folks have been mowing for over a month down here but up top (1600') we're a couple weeks behind.
First mow, early April, was mostly "knock down the clumps" to kinda even things up a bit, but not everything was mower-height yet. Not everything was even green yet (still lots of winter brown). But the clumps were YUGE.
Second mow last weekend was full-bore, every blade was tall enough, everything is GREEN. Trees are filling in now, too.
Soon, it'll be 2x a week season for a month or so, until summer heat really sets in and things slow down a bit.
Good thing I love being in the sun, and doing yardwork! And, my zero turn knocks out my 4 acres in about an hour and a half...so it doesn't kill my WHOLE weekend...