The twenty-second annual Rachel Carson Trail Challenge will take place on June 23, 2018, the Saturday nearest the summer solstice, the longest day of the year. The Challenge is a 34-mile long, one-day, sunrise to sunset endurance hike on nearly the entire brutal Rachel Carson Trail. Unlike a footrace, the "challenge" is not to win, but to endure, to finish the hike in one day. This time, the Challenge starts in Harrison Hills Park at sunrise, 5:50 AM, and ends 34 miles later in North Park. The deadline for finishing is sunset, 8:54 PM or 15 hours 4 minutes.