The 100 Deadliest Days: Why Summer Is the Most Dangerous Season for Teen Drivers

State-level summer fatality data is drawn from MoneyGeek's analysis of NHTSA FARS data for June, July, and August 2022, 2023, and 2024, normalized per 100 million vehicle miles traveled using FHWA monthly VMT data. Teen summer fatality counts reflect NHTSA FARS person-level records for fatally injured drivers aged 15–20.

1. The National Picture: Summer 2024 in Context

1.1 The 100 Deadliest Days

The AAA Foundation for Traffic Safety coined the term "100 Deadliest Days" to describe the Memorial Day to Labor Day driving window, a period during which fatal crashes involving teen drivers increase significantly as school ends and young drivers spend more unsupervised time behind the wheel.

In summer 2024 (June through August), 10,438 people died on American roads, averaging 113 deaths per day (MoneyGeek / NHTSA FARS 2024 ARF). Overall summer fatalities have improved: they fell 3.8% in 2023 and another 4.5% in 2024, a two-year reduction of 926 deaths. Thirty-nine states plus Washington D.C. showed full-year decreases in 2024 (NHTSA DOT HS 813791).

1.2 The Seasonal Pattern

Over the five-year period from 2019 to 2023, 7,193 teen drivers ages 15–19 were killed in crashes nationally. More than 31% of those deaths occurred during the Memorial Day to Labor Day window, a consistent, recurring pattern that has persisted across pandemic and post-pandemic years alike (AAA Northeast / NHTSA FARS). In 2023 alone, 860 people were killed in crashes involving a teen driver during the 100 Deadliest Days, a 21% increase from 2022 (AAA Western and Central New York, 2025).

On average, 8 people are killed per day in crashes involving a teen driver during summer months, compared to 7 per day during the rest of the year (AAA / NHTSA). The gap is modest in absolute terms but persistent and structurally predictable, which means it is also preventable.

Figure 1. Summer teen driver fatalities — national trend, 2019–2024 (June–August, drivers ages 15–20)

1.3 The Connecticut Data Point

At the state level, the picture is particularly stark in some jurisdictions. In Connecticut, data from the Connecticut Crash Data Repository show that over the four years from 2020 to 2023, 106 fatal crashes involved teen drivers during the Memorial Day to Labor Day period, representing 38% of all fatal teen crashes statewide in just those three summer months (Connecticut DOT, 2025). Twenty-three teen drivers were killed in Connecticut alone during the 100 Deadliest Days over that period.

2. Why Summer Is Deadlier: Contributing Factors

2.1 More Miles, Less Structure

The most direct explanation for the summer surge is also the simplest: teens drive more. School's out, schedules are looser, and the combination of jobs, social events, and recreational trips means more hours behind the wheel than at any other point in the year. More exposure to driving means more exposure to risk, particularly for drivers in their first year of licensure when crash risk is highest.

AAA Foundation research identifies three primary structural drivers of the summer increase: more nighttime driving, more passengers in the vehicle, and longer highway trips that outpace a new driver's experience (AAA Foundation, 2025). All three are a direct function of the freedom summer brings, and all three are risk factors with strong research support.

2.2 Nighttime Driving

Night driving is substantially more dangerous for teen drivers than daytime driving. Limited visibility, fatigue, and the increased presence of impaired drivers on the road all compound inexperience. In summer, teens drive later into the night more frequently, and without the school-night structure that otherwise keeps driving hours bounded.

GDL nighttime driving restrictions exist precisely because this risk is so well-documented. The IIHS best-practice standard calls for a restriction beginning no later than 8 p.m. for intermediate license holders. In states with weak GDL laws, and for teens who have graduated to unrestricted licenses, those protections have expired by the time summer arrives. In 2023, 20% of teen crash deaths occurred between 9 p.m. and midnight, and another 16% between midnight and 3 a.m. (IIHS Fatality Facts: Teenagers, 2023).

2.3 Passenger Risk

The presence of teen passengers in a teen driver's vehicle is one of the most consistently documented risk amplifiers in traffic safety research. AAA Foundation research found that a single teen passenger increases a teen driver's crash risk by 44%. When only teen passengers are present, the fatality rate for all people involved in the crash increases by 51% compared to crashes where the teen driver is alone (AAA Foundation for Traffic Safety, 2018). Summer dramatically increases the likelihood of multi-passenger driving: trips to the beach, parties, summer jobs, and other events. The peer dynamic that elevates risk, including speeding, distraction from passenger interaction, and social pressure against slowing down, is at its most intense during summer months.

2.4 Distraction

The AAA Foundation for Traffic Safety has found that distractions played a role in nearly 60% of moderate to severe crashes involving teen drivers. Interacting with passengers and cell phone use are the most frequent distraction types. In summer, both increase simultaneously: more passengers and more unstructured time create a driving environment where cognitive load is consistently elevated. NHTSA data show that teen drivers ages 15–20 have the highest rate of distracted involvement in fatal crashes at 7%, compared to 5% across all age groups (NHTSA DOT HS 813703, 2025).

2.5 Alcohol and Impairment

Summer months account for approximately 30% of all DUI-related fatalities nationally (NSC Injury Facts 2025). The combination of holidays, graduation events, outdoor parties, and reduced parental oversight creates elevated impairment risk for young drivers. In 2023, 32% of fatally injured teen drivers ages 16–19 had positive blood alcohol concentrations, and 687 teen drivers were killed in DUI-related crashes, an 8.7% increase from the prior year (NHTSA FARS 2023).

Figure 2. Risk factor contribution to summer teen driver crash elevation (relative to non-summer baseline)

3. State Rankings: Where Summer Is Most Dangerous for Teen Drivers

State-level rankings below reflect two measures: total summer teen driver deaths (absolute count, summer 2024) and summer fatality rate per 100 million VMT (all ages, summer 2024). Data are drawn from MoneyGeek's analysis of NHTSA FARS data normalized by FHWA monthly VMT figures. Together these measures capture both population-scale burden and road-risk intensity.

Figure 3. States with the most teen driver deaths during summer 2024 (absolute count, drivers ages 15–20, June–August)

Figure 4. Summer fatality rate per 100 million VMT — selected states, summer 2024 (all ages)

4. State Profiles: Lessons from the Worst and Best Performers

Texas: Volume, Roads, and Partial Protections

Texas leads the nation in absolute summer teen driver deaths with 68 in summer 2024. As the second most populous state with an extensive highway network, high per-capita VMT, and among the fastest-growing teen populations in the country, Texas generates large absolute fatality counts even at moderate per-capita rates. Texas has a partial handheld ban limited to school and work zones, a moderate GDL framework, and requires driver education for applicants under 18 with a 6-hour course for those 18–25. The state's rural highway network, combined with a culture of long-distance driving, means summer road trips frequently outpace new drivers' experience in ways that urban driving does not.

Mississippi: Rate, Not Volume

While Mississippi's absolute summer teen death count is lower than more populous states, its rate-based ranking is unmatched nationally. At 1.88 deaths per 100 million VMT, Mississippi's summer fatality rate worsened 11.9% over the two-year study period and is nearly triple the rate of Massachusetts. Mississippi has no mandatory driver's education requirement and a weak GDL framework. The convergence of rural roads, extended distances between trauma centers, low seatbelt compliance, and minimal structural protection for teen drivers creates conditions where summer exposure produces disproportionate fatalities.

Wyoming: The Summer Concentration Effect

Wyoming presents one of the most striking patterns in the data. A Bumper.com analysis of FARS records found that more than 50% of all teen driving fatalities in Wyoming occur between June and September, the highest summer concentration of any state. The national average is 37.5%. Wyoming has no formal driver's education requirement and no handheld ban. Its sparse population means fewer annual teen deaths in absolute terms, but when they do occur, summer is the dominant season by a large margin.

Georgia: The Model for Improvement

Georgia recorded the largest rate improvement of any state in the study period, with its summer fatality rate falling 25.2% from 1.31 to 0.98 deaths per 100 million VMT and 108 fewer absolute summer deaths compared to 2022. Georgia enacted a comprehensive hands-free law in 2018 that has produced sustained reductions in distraction-related crashes. The state also requires driver education for applicants under 18 and has a moderate-to-strong GDL framework. Georgia's trajectory demonstrates that sustained, multi-pronged policy investment combining law, education, and enforcement produces measurable summer safety improvements.

Massachusetts: The Benchmark

Massachusetts holds the lowest summer fatality rate in the country at 0.67 deaths per 100 million VMT. The state requires driver education for all first-time applicants, has strong GDL provisions, and enforces a full handheld ban with primary enforcement. Massachusetts also has no preemption laws blocking local jurisdictions from enacting stricter rules. The combination of high urban density, strong structural protections, and mandatory education creates the policy environment that produces the safest summer outcomes in the US.

5. Driver Education and the Summer Risk Window

5.1 The Spring Instruction Gap

The most consequential driver education timing decision a family can make is often invisible: whether their teen completes formal instruction before or after summer driving begins. A teen who gets their license in late spring and enters summer with only the state minimum (6 hours of professional instruction, limited highway and nighttime experience) faces their highest-risk driving season with their lowest experience level. The research is consistent: crash risk is highest in the first months after licensure, the period that for many new spring-licensed teen drivers falls squarely in the 100 Deadliest Days window.

Completing extended professional instruction in the months before summer, including deliberate practice on highways, at night, with passengers, and in adverse conditions, directly prepares new drivers for the specific risk factors that make summer dangerous. This is targeted preparation for a known, predictable high-risk period.

5.2 What the Evidence Shows

The University of Nebraska–Lincoln longitudinal study (Shell et al., 2015) found that formally trained teen drivers were 24% less likely to be in an injury or fatal crash in their first year, and the safety advantage persisted through the second year. That first year, for teens licensed in spring, overlaps substantially with summer driving season. The AAA Foundation connects the summer increase specifically to the mismatch between experience and exposure: highway trips, nighttime driving, and multi-passenger situations that outpace what new drivers have practiced (AAA Foundation, 2025).

Professional instruction programs that include deliberate highway driving, nighttime driving practice, and passenger management scenarios directly address the risk factors that drive summer fatalities. These scenarios are not covered by most state minimum BTW requirements, which typically involve local road driving in controlled conditions during daylight hours.

5.3 Household Rules for the Summer Window

For families with newly licensed teen drivers entering their first summer, the research supports several specific household practices that replicate the protections GDL laws provide, even for teens who have technically graduated to full privileges:

• No driving after 9 p.m. for the first full summer, aligned with IIHS best-practice GDL nighttime restrictions.
• No more than one teen passenger for the first three months of summer driving, regardless of license stage.
• Mandatory seatbelt rule: the car does not move until everyone is buckled, stated as non-negotiable before the first solo trip.
• No solo highway driving until the teen has completed at least one supervised highway session at freeway speeds.

6. Key Findings

1. Teen drivers are the only age group whose summer fatality rate worsened from 2022 to 2024. While all-age summer traffic deaths fell 8.1%, summer teen driver deaths rose 17.2% to 635 in summer 2024. Teen drivers now account for 6.1% of all summer traffic deaths, up from 4.8% in 2022.
2. More than 31% of all annual teen driver fatalities occur during the 100 Deadliest Days window. The seasonal concentration is consistent across years, making it both predictable and preventable.
3. Texas leads in absolute summer teen deaths with 68 in 2024; Mississippi leads in rate. Mississippi's summer fatality rate of 1.88 per 100 million VMT is nearly triple Massachusetts' rate of 0.67, the widest state spread in the report series.
4. Three converging risk factors drive the summer surge: more nighttime driving, more teen passengers, and longer highway trips that outpace new driver experience. All three are direct products of summer freedom and all three are addressable through professional instruction and household rules.
5. Georgia is the model for improvement. Its 25.2% summer fatality rate reduction over two years, driven by a sustained hands-free law, mandatory driver education, and active enforcement, demonstrates that multi-pronged policy investment produces measurable results.
6. The timing of driver education relative to summer matters. Completing extended professional BTW instruction before summer, including highway, nighttime, and passenger scenarios, provides targeted preparation for the highest-risk period a new driver will face.

Works Cited

1. AAA Foundation for Traffic Safety. "The 100 Deadliest Days: Teen Driver Deaths Jump in Summer Months, 2025." aaafoundation.org
2. AAA Foundation for Traffic Safety. "Assessing Fatality Rates in Crash Involvement for Motorists and Non-Motorists in Teen Driver Crashes by Risk Factor." 2018. aaafoundation.org
3. AAA Northway. "Teen Crashes Increase In Summer Months." Dec. 2024. northway.aaa.com
4. AAA Western and Central New York. "The 100 Deadliest Days: Teen Driver Deaths Jump in Summer Months." 2025. westerncentralnyaaa.com
5. Bumper.com. "Summer Tragedy: Which States See the Most Teen Driving Fatalities?" 2023. bumper.com
6. Centers for Disease Control and Prevention. "Risk Factors for Teen Drivers." Updated Aug. 4, 2025. cdc.gov
7. Colorado Department of Transportation. "CDOT Urges Parents to Talk to Teens About Safe Driving Ahead of 100 Deadliest Days." May 28, 2025. codot.gov
8. Connecticut Department of Transportation. "Fatal Teen Driver Traffic Crashes Spike in the Summer." 2025. portal.ct.gov
9. Insurance Institute for Highway Safety. "Fatality Facts 2023: Teenagers." 2025. iihs.org
10. Insurance Institute for Highway Safety. "Graduated Licensing Laws Table." 2024. iihs.org
11. MoneyGeek. "America's 100 Deadliest Driving Days by State." April 15, 2026. moneygeek.com
12. National Highway Traffic Safety Administration. Traffic Safety Facts 2024 Annual Report File. DOT HS 813791, April 1, 2026. crashstats.nhtsa.dot.gov
13. National Highway Traffic Safety Administration. Young Drivers: 2023 Data. DOT HS 813736, July 2025. crashstats.nhtsa.dot.gov
14. National Highway Traffic Safety Administration. Research Note: Distracted Driving in 2023. DOT HS 813703, April 2025. crashstats.nhtsa.dot.gov
15. National Highway Traffic Safety Administration. FIRST: Fatality and Injury Reporting System Tool. cdan.dot.gov/query
16. National Safety Council. "Teen Drivers." NSC Injury Facts, updated May 2026. injuryfacts.nsc.org
17. Shell, Duane H., and Ian Newman. "UNL Study: Driver's Ed Significantly Improves Safety." University of Nebraska–Lincoln, 2015. research.unl.edu
18. Federal Highway Administration. "Traffic Volume Trends, Monthly VMT by State, 2022–2024." fhwa.dot.gov