The pilot's inadequate compensation for wind conditions and failure to maintain aircraft control after encountering wind gusts during the landing flare/touchdown which resulted in an in-flight collision with trees and subsequent nose over. A factor contributing to the accident was the presence of gusty wind conditions.

The pilots misjudgement of the tailwind, and excessive application of brakes during the off airport landing.

The pilot's selection of unsuitable terrain for landing. Factors in the accident were snow covered terrain, and a hidden obstruction.

DIRECTIONAL CONTROL NOT MAINTAINED BY THE PILOT IN COMMAND. A FACTOR IN THE ACCIDENT WAS THE INADVERTANT GROUND LOOP/SWERVE.