[bxracer69]

I deal with this kinda thing on a daily basis at work in the parks department. And recently had a discussion with my boss about this.

Aspens are a poor choice for lower altitude because they are a high altitude tree which mainly lives between 6500-10000 ft. They also do not fair well in high temperatures, and need to live in colonies of 5 or more trees to live optimally.

A wiser choice could be a maple tree or poplar. A talk with a local nursery or within the close vacinity of your house should be able to pin-point a perfect match for your yard and soil type.