2021 California Prokart Challenge battles continued at Willow Springs 2021 California Prokart Challenge battles continued at Willow Springs Superkarts! USA regional program rolls through Rosamond for penultimate round of 2021 program Bas Kaligis / Sunday, September 19, 2021 0 1313 Article rating: No rating The California ProKart Challenge hosted the penultimate round of the 2021 season on the September 11-12 weekend at the Willow Springs International Raceway. The Rosamond, California facility has been the site of many Superkarts! USA regional program events in the past, including both the famed Streets of Willow course and the karting circuit. The two-day event for Round Five of the 2021 championship program was held on the nine-turn, 6/10-mile kart track in the counter-clockwise direction. Read more