On Mar 16, 7:17 am, wrote:
When you aerate, it gives the grass roots the
opportunity to expand into the loosened soil, which won't happen if
the grass is dormant.

Well, yes, they do do that but that's not the purpose for aerating the
soil. The purpose is to get air down to the root level. That's why
it's called "aerate". Plant roots need air and moisture to grow, and
they will grow year round even though the top may be dormant. But they
do grow faster in the summer than during cold weather.
Bob S.