The pilot reported that he was making his first landing of the summer season on a high mountain dirt/turf airstrip. The airplane touched down left of centerline, which sloped to the left. The pilot was unable to correct back to the right before the left wing struck a pine tree next to the airstrip. The airplane spun to the left and skidded sideways when the right wing contacted the surface. Both wings and fuselage were substantially damaged. The pilot reported no preimpact mechanical malfunctions or failures with the airplane that would have precluded normal operation.