"Brandon Herlein" wrote in message
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when is a good time to aerate your yard?

In the spring when the grass just gets good and green is the best time.

are there signs of when you need to aerate your yard?

The lawn is not healthy, particularly in high traffic areas.

how often should you aerate you yard?

It depends on how much traffic your lawn receives, what type of grass you
have, and what type of soil you have. Some grasses don't mind compacted
soils as much as others. If you have pets or kids that are outdoors a lot
you might need to aerate more often. Clay soils compact easily, sandy soils
may not ever need aeration.

are there some tips when aerating you yard??

Tips were well covered in the previous reply.