Make plans early to attend one of three magical evenings on Grandfather Mountain during peak firefly mating season. Events begin with naturalist-led programs before moving to the viewing area after dark. Accessible for limited mobility. No pets, no flash photography, no alcohol. The 2026 Grandfather Glows dates are: Tuesday, June 16, with a rain date of Wednesday, June 17; Thursday, June 18, with a rain date of Friday, June 19; Saturday, June 20, with a rain date of Sunday, June 21. Hours: 7–11 pm. Winning lottery tickets required.