Federal data points to a June–July risk window — here’s what drives it, and how parents can protect their kids.
The short answer: Among teens who try a substance for the first time, a disproportionate share start in June and July — largely because it strips away the daily structure (school, schedules, supervision) that normally keeps risk in check. The fix is to replace that idle, unsupervised time with structure and stay connected.
Key takeaways
- Teen substance use is at a historic low — but among teens who do try a substance for the first time, a disproportionate share start in June and July.
- The driver isn’t summer itself. It’s the loss of daily structure — school, schedules, supervision — that normally keeps risk in check.
- The earlier use begins, the more it matters: drinking before age 15 is linked to roughly four times the risk of later alcohol dependence.
- Three research-backed protections work best: replace idle time with structure, stay connected through everyday monitoring (not surveillance), and talk early and without judgment.
- The hardest part is getting help fast. RevCore’s YouthCore program offers same-day appointments with no waitlist for young people ages 12–26, accepts Medicaid, Medicaid Managed Care, and Aetna, and provides services in Spanish.
Here’s some good news you may not have heard: American teen substance use is at a historic low.
According to the 2025 Monitoring the Future survey — the long-running national study funded by the National Institute on Drug Abuse — adolescent drug and alcohol use has stayed near record lows for the fifth straight year. The steep drop that began during the pandemic never bounced back. Today, 91% of 8th graders, 82% of 10th graders, and 66% of 12th graders report not using marijuana, alcohol, or nicotine at all.
So the risk is fading, right?
In one sense, yes. But “fewer” isn’t “none.” Every year, a new group of teens still tries a substance for the first time — and federal data shows it concentrates into the two months we’re in right now.
More teens start using in June and July than any other months
For years, federal data has shown the same pattern: among teens who try a substance for the first time, a strikingly large share do it in June and July.
The clearest picture comes from the Substance Abuse and Mental Health Services Administration’s National Survey on Drug Use and Health. In data collected between 2002 and 2010, the average June or July day saw more than 11,000 teens drink alcohol for the first time — well above the 5,000 to 8,000 typical of other days — with first-time marijuana use following the same summer curve. Overall teen substance use has dropped substantially since that period, so the daily totals today would be lower. But the seasonal pattern itself has held: of the teens who do start, a disproportionate number still start in summer.
SAMHSA’s own explanation is that these are the months when adolescents are “on break from school and may have more idle time, fewer responsibilities, and less adult supervision.”
Summer removes the structure that keeps risk in check
The instinct is to blame summer itself — the heat, the parties, the freedom. But researchers have zeroed in on something more specific and more useful: unstructured time.
A 2021 study tracking high school seniors over almost two decades found that the rise and fall of “unstructured socializing” — time teens spend together without a plan, a goal, or an adult nearby — accounted for roughly 86% of the changes in teen risk behaviors, including substance use. When that loose, unsupervised time goes up, so does risk. When it goes down, risk follows.
Three forces tend to converge over the summer:
1. Idle time.
The school year hands teens a built-in structure: classes, practices, homework, bedtimes. Most of this is stripped away in the summer. Researchers describe unstructured, unsupervised hours as one of the most consistent environmental risk factors for adolescent substance use.
2. Boredom.
A 2025 study in Adolescents found boredom meaningfully predicts teen substance use, with substances acting as a kind of stimulant. In other words, it’s a way to break the monotony of empty afternoons.
3. Less supervision.
Working parents, longer days, and more time with peers mean fewer adults in the room. This relates to what researchers call “routine activity”. You can think of it like a formula: unplanned time, plus peers, minus supervision, equals both the opportunity to experiment and a social reward for doing it.
Summer doesn’t create new dangers so much as it removes the structures that hold the ordinary ones in check.
A single summer can shape the years that follow
It would be easy to file teenage experimentation under “phase.” For many kids, it is. But the age a young person first uses a substance carries real weight.
The National Institute on Alcohol Abuse and Alcoholism has found that people who begin drinking before age 15 are about four times more likely to develop alcohol dependence at some point in life than those who wait until 21. More than 40% of those who started before 15 met the criteria for dependence at some point — compared with around 10% of those who started at 21 or later.
Researchers still debate whether early use directly drives that risk or mainly flags a teen who was already vulnerable. But for a parent or a clinician, the takeaway lands the same either way: the earlier use starts, the more attention it deserves — and delaying that first experience is one of the most protective things in reach.
3 research-backed ways parents can protect their kids this summer
The same research that explains the summer spike also points to what works. Thankfully, none of it requires turning your home into a fortress.
1. Replace idle time with structure.
Help your child sign up for a summer job, a sports league, a class, or a volunteer commitment. The specific activity matters less than the fact that it fills hours that would otherwise be unstructured. Researchers call this “displacement,” and it’s one of the most reliable protective effects we have. The Icelandic prevention model, often cited as the gold standard, paired exactly this kind of structured-activity push with a dramatic drop in teen substance use.
2. Monitor — but think connection, not surveillance.
Simply knowing where your teen is, who they’re with, and what they’re doing is strongly protective. The CDC reports that 86% of teens say their parents usually or always know their whereabouts, and that this kind of monitoring is linked to less substance use and better mental health. Recent research shows monitoring works best not as punishment after the fact, but as an ongoing, everyday closeness that heads off problems before they start.
3. Talk early, and without judgment.
Open, low-key conversations about stress, boredom, and peer pressure — the kind where a teen feels heard rather than lectured — consistently show up as a protective factor. The goal isn’t a single dramatic “talk”, but being approachable enough that your teen comes to you first.
Early warning signs a teen is using drugs or alcohol
Most summer experimentation doesn’t announce itself. The signs are usually ordinary changes that are easy to explain away one at a time — which is exactly why they’re easy to miss. No single item below confirms anything, but they’re worth paying closer attention.
Changes in routine and relationships
- A sudden new friend group, especially one your teen is vague or secretive about
- Pulling away from longtime friends or family
- Growing secrecy — locked phones, deleted messages, unexplained absences
- Being evasive about where they’ve been or who they were with
Changes in mood and behavior
- Noticeable shifts in mood, irritability, or unusual defensiveness
- Lost interest in sports, hobbies, or activities they used to care about
- Drop in motivation or energy
- Changes in sleep — staying up much later, sleeping all day, or both
Physical and practical signs
- Bloodshot eyes, changes in appetite, or unexplained weight shifts
- Money or valuables going missing
- Unfamiliar smells, or new items like vape pens, lighters, or eye drops
- Declining attention to appearance or hygiene
Of course, adolescence comes with mood swings, new friendships, and a healthy push for privacy — most of these, on their own, are a normal part of growing up. What matters is the cluster and the change: several signs appearing at once, or a clear departure from your teen’s usual baseline. Trust what you know about your own kid. If something feels off, it’s worth a low-key, non-judgmental conversation rather than a confrontation — and if the picture doesn’t ease, that’s a reasonable point to reach out for professional guidance.
The hardest part is getting help fast
The hard part for most families isn’t recognizing a problem. It’s getting help quickly once they’re finally ready to act.
That’s where RevCore comes in. Our YouthCore program is built specifically for young people ages 12–26 navigating substance use and mental health challenges. We offer same-day appointments with no waitlist, accept Medicaid, Medicaid Managed Care, and Aetna, and provide services in Spanish as well. When a parent is ready, we can see their teen that day — not three weeks from now.
If you know a family who could use that kind of support this summer, we’d love to help.
Make a referral at revcorerecovery.com/make-a-referral, or call (212) 966-9537 or visit revcorerecovery.com/youthcore to find out more. Our doors are always open for you.
Frequently asked questions
Why do teens use more substances in summer?
Among teens who try a substance for the first time, a disproportionate share start in June and July. The main driver isn’t summer itself but the loss of daily structure — school, schedules, and adult supervision — that normally keeps risk in check. Researchers point to unstructured, unsupervised time as one of the most consistent environmental risk factors for adolescent substance use.
What are the warning signs that a teen is using drugs or alcohol?
Common signs include a sudden new friend group, increased secrecy, shifts in sleep or mood, lost interest in activities they used to enjoy, and unexplained changes in appetite or energy. No single sign confirms substance use: what matters most is a clear change from your teen’s usual baseline.
At what age is early substance use most dangerous?
The earlier it starts, the more it matters. The National Institute on Alcohol Abuse and Alcoholism has found that people who begin drinking before age 15 are about four times more likely to develop alcohol dependence at some point in life than those who wait until 21. Delaying a teen’s first use is one of the most protective steps within a parent’s reach.
How can parents prevent teen substance use over the summer?
Four research-backed approaches help most: replacing idle time with structure (a job, sport, class, or volunteer commitment), staying connected through everyday monitoring rather than surveillance, talking early and without judgment, and knowing the warning signs to watch for. The goal isn’t a fortress at home, but filling unstructured hours and staying approachable.
Where can a family get help quickly if they’re worried about a teen?
The hardest part for most families isn’t spotting a problem — it’s getting help fast once they’re ready. RevCore’s YouthCore program is built for young people ages 12–26 navigating substance use and mental health challenges, with same-day appointments and no waitlist. RevCore accepts Medicaid, Medicaid Managed Care, and Aetna, and offers services in Spanish. Make a referral or call (212) 966-9537.
References
- National Institute on Drug Abuse & University of Michigan. Monitoring the Future Survey: 2025 Results. 2025. https://www.nih.gov/news-events/news-releases/reported-use-most-drugs-remains-low-among-us-teens
- Substance Abuse and Mental Health Services Administration (SAMHSA). The NSDUH Report: Monthly Variation in Substance Use Initiation Among Adolescents. 2012. https://www.samhsa.gov/data/sites/default/files/NSDUH080/NSDUH080/SR080InitiationSubstanceUse2012.htm
- National Academies of Sciences (citing Grant & Dawson). Consequences of Underage Drinking (in Reducing Underage Drinking: A Collective Responsibility). https://www.ncbi.nlm.nih.gov/books/NBK37591/
- Borodovsky JT, Krueger RF, Agrawal A, et al. U.S. Trends in Adolescent Substance Use and Conduct Problems and Their Relation to Trends in Unstructured In-Person Socializing With Peers. Journal of Adolescent Health, 2021. https://pmc.ncbi.nlm.nih.gov/articles/PMC8403622/
- The Role of Boredom in the Development of Risky Behaviours Among Adolescents. 2025. https://doi.org/10.3390/adolescents5030036
- Nawi et al. Risk and Protective Factors of Drug Abuse Among Adolescents: A Systematic Review. BMC Public Health, 2021. https://link.springer.com/article/10.1186/s12889-021-11906-2
- Family Structure, Unstructured Socializing, and Heavy Substance Use Among Adolescents. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9317110/
- Centers for Disease Control and Prevention (CDC). Parental Monitoring (Healthy Youth Parent Resources). https://www.cdc.gov/healthy-youth-parent-resources/positive-parental-practices/parental-monitoring.html
- Prevention of Adolescent Stimulant Drug Use: Findings From the Irish Planet Youth Survey (Iceland prevention model). https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12373172/