Pike's Peak Treeline Microclimatology: Our study site in Pike's Peak is one of the few abrupt treelines that is advancing with recent regional warming. We established that there is most likely an eddy in the lee of timberline during askew flow as evidenced by the increasing size (both length and height) of a slow air bubble from parallel to askew flow. This increased size of the slowed air bubble creates sheltered conditions downwind of the shelterbelt. Shelterbelts are known to ameliorate agricultural health because eddies can create beneficial climatic conditions through decreased wind speeds. However, the eddy created in our study site may not create a better environment for tree growth. Tree establishment above 2H must be inhibited by too high of wind speeds creating high shear and near non-existent snow cover during the winter. The area between timberline and 2H has been slowly filling in with seedlings since the mid/late 1800's. The trees in this section do not grow into krummholz form. If a seedling can be established it grows into a fully-grown symmetrical tree. It is difficult, but not impossible for seedlings to become established in this zone. Tree establishment is most likely dependent on very specific microsites within this area that have some wind flow, moderate snow cover in the winter, and 40-80% open sky exposure.