The first day of summer 2024 in the Northern Hemisphere is June 21, according to our handy beginning of summer calendar. Mark your calendars and prepare to enjoy the longest day filled with sunlight. Use our beginning of summer planning tools to help you schedule fun activities like trips to the beach, outdoor barbecues, concerts, picnics at the park with friends and family, outdoor recreation, and making magical memories during the first days of summer. https://firstdayofsummer.info/