Best time for Aeration

when would be a best time for Aeration???

It depends.

My favorite answer would be "never".  Most folks that aerate get very little gain from it.  If you need aeration, that could be a sign that your soil sucks and you should look into that.  Maybe aeration can be part of far larger plan to improve the soil - but most aeration is not that.

I wonder if aeration is used by chem lawns because there are no longer earthworms to do the job.

I suspect that a lawn that is loaded to the gills with earthworms has no need for aeration.

All that being said:  if I had miserable, wormless dirt and I was bringing in a load of compost and lime in the spring or fall, I think it would help to aerate just before that.

BUT!  Let me be even a little more obnoxious about this:  I, personally, would never aerate my own lawn.  If it was so horrible that what the soil needed was to aerate, then I would either till, or I would plant a cover crop to rip open the soil and introduce a whole bunch of organic matter.

I agree with paul. the best thing to do is to arrange it so you don't need to aerate the soil becasue it is healthy. adding some organic material is a more long term solution that will invigorate your lawn in other ways too.

Paul had some good points.

Aeration is used by the big companies as a sales tool, AND because the soil is dead. On the other hand, most new developments where houses are built are stripped of the topsoil and the topsoil is sold off, leaving not much more than hardpan that is compaction prone to say the least.

Good soil is the key, and aeration can help get you there in the beginning.

As a lawn care provider I've only ever done it on new lawns to get them established and more healthy to get nutrients and oxygen to the root zone.

Thank you all, so paul should i start putting Ringer in my lawn??? or get the PH level tested before i put anything in it?

Testing the pH has to do with adjusting the pH - it is not related to the use of N based fertilizers (well, not enough to tie the two together). 

I think you should only put down the ringer stuff when you get close to the time that your grass will go through a growth spurt.  If you are in texas, you probably have a warm season grass.  So I would guess it would be in early june.

For those of us with cool season grasses, that would probably be in late April or early May.