The pilot and passenger were departing a remote and sandy area in the tailwheel-equipped airplane. The pilot had utilized the area many times in the past. The takeoff area is about 1,940 feet mean sea level and the temperature was about 70 degrees F. Variable wind conditions were blowing from the left side of the takeoff area with gusts of 25 knots. During the takeoff roll, a gust of wind pushed the airplane to the right into several alder trees. The airplane then ground looped and received damage to the left wing spar and left aileron.