The "100 Deadliest Days": Why Summer Is the Riskiest Season for Teen Drivers

Traffic-safety researchers have a grim nickname for the stretch between Memorial Day and Labor Day: the “100 Deadliest Days.” The AAA Foundation for Traffic Safety coined the term because, year after year, the summer months see a meaningful rise in fatal crashes involving teen drivers compared to the rest of the year.

For families with a newly licensed teen, summer is exactly when the risk and the opportunity collide — more freedom, more driving, and more of the conditions that make new drivers vulnerable.

Why summer is different

A few things change once school lets out:

• More time behind the wheel. Teens drive more miles in summer, often without a set schedule or destination.
• More passengers. Summer trips with friends are common, and a car full of peers is one of the best-documented risk multipliers for young drivers.
• More night and late-evening driving. Long days end in late nights, and nighttime driving carries a higher fatal-crash rate for every age group — especially inexperienced ones.
• Less routine. The structured weekday commute to school is replaced by spontaneous trips, which tend to involve unfamiliar routes and looser planning.

What the crashes have in common

When safety organizations analyze teen crashes, the same handful of factors show up again and again: speeding, distraction, not wearing a seatbelt, and impairment. These aren’t exotic failures — they’re everyday decisions, which is exactly why they’re so addressable.

The encouraging part: the biggest summer risk factors are the ones families have the most direct influence over.

What actually helps

• Set passenger limits. Even where the law allows it, consider keeping the car to one passenger — or none — during the first several months.
• Talk about night driving. Practice it together before letting a teen do it solo, and set a reasonable curfew.
• Keep practicing. A license is the start of learning, not the end. Riding along occasionally during the first summer pays off.
• Make the phone unreachable. “Do Not Disturb While Driving” and a phone in the glovebox remove the temptation entirely.

Summer should be when a new driver builds confidence — not when a small mistake turns into a tragedy. A few clear family rules go a long way toward making sure it’s the former.