Run Norfolk’s scenic trails on Sunday, Oct. 6, during the 11th annual Haystack Mountain Challenge. Sponsored by the Norfolk Land Trust, the half marathon, which includes two runs up Haystack mountain, starts at 9:30 a.m. The 10-K kicks off at 10:45 a.m. and includes a summit of Haystack. The 5-K starts at 11 a.m. and features a traverse through Barbour Woods. All races start at the Barbour Woods trailhead, 75 Lovers Lane. Register through https://runsignup.com.