Understanding School Shooting Statistics: Trends, Impacts, and Prevention

School shootings are a grave concern in the United States. Firearms have become a leading cause of death for American youth, and while school shootings represent only a fraction of overall gun deaths among this age group, the number of incidents has been on the rise since the late 1990s. In fact, 2023 saw more school shooting incidents than any other year in history. This article examines the available data, explores the factors contributing to these tragedies, discusses the profound impact on students and communities, and considers potential prevention strategies.

Defining "School Shooting": A Matter of Perspective

One of the challenges in analyzing school shooting statistics is the lack of a single, universally accepted definition. Different organizations use varying criteria, leading to discrepancies in reported numbers. Some databases count any incident where a gun is brandished or fired on school property, regardless of intent or injury, while others focus solely on incidents with multiple victims or specific outcomes.

For example, the K-12 School Shooting Database (K-12 SSDB) counts any instance where a gun is brandished with the intent to intimidate, fired, or a bullet strikes K-12 school property. This broad definition results in a higher number of reported incidents compared to databases with stricter criteria.

It's important to consider these definitional differences when interpreting school shooting statistics. Understanding the criteria used by different sources helps to contextualize the numbers and avoid misinterpretations.

Trends in School Shootings

Despite varying definitions, most data sources indicate an increase in school-related gun incidents since the late 1990s, with a peak in the early 2020s. While mass shootings, characterized by multiple fatalities or injuries, garner significant media attention, they represent only a small percentage of the total number of school shooting incidents. The majority of incidents involve lower casualties, but these events can still have a profound impact on students, families, and communities.

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Since the Columbine school shooting in 1999, there have been over 420 school shootings across the United States. More than 160 of these shootings occurred after the onset of the COVID-19 pandemic, indicating a significant increase. While 2024 marked the beginning of a decline in the number of mass shootings per year since the onset of the pandemic, this trend did not apply to school shootings, the number of which remains consistently high to date.

Who and Where: Understanding the Context

Analyzing the characteristics of school shooters and the locations where shootings occur can provide valuable insights for prevention efforts.

Demographics of Shooters

Age: The vast majority (around 89%) of shooters in K-12 schools are younger than 22 years old, often high school age (15-18).
Gender: An overwhelming majority (98%) of school shooters are identified as male.
Relationship to School: Between 43.1% and 45% of K-12 shooters are current or former students of the targeted school.

Risk Factors

Certain factors can increase the risk of someone perpetrating a shooting at a school, including:

A history of bullying or rejection
Mental illness or behavioral problems
Idealization of violence
Abuse

Location and Timing

Geographic Distribution: Southern states have reported the highest numbers of school shootings overall since at least 2008. However, states with smaller populations may have higher shooting rates per capita when adjusted for population. In 2025, California, Texas, and Tennessee had the highest number of school shooting incidents. In contrast, Delaware has the highest exposure rate to school shootings per capita, at 359 per 100,000, followed by Washington, D.C.
School Level: Nearly 60% of K-12 shooting incidents occur at high schools, reflecting the concentration of older students and complex social dynamics. Around 20% take place at elementary schools, 10.2% at middle schools, 2.1% at junior high schools, according to the K-12 SSDB.
Location on Campus: Contrary to popular imagery of classroom attacks, many K-12 shootings occur outside of the classroom, with up to two-thirds happening in outdoor areas.
Time of Day: Most school shootings have happened during morning classes, according to data from Statista.

It is also important to recognize that according to the Government Accountability Office (GAO), only about 14% of gun violence that takes place on K-12 school property is school-targeted. The remaining incidents may be related to disputes (around a third) or accidental (16%).

The Devastating Impact of School Shootings

The consequences of school shootings extend far beyond the immediate deaths and injuries. These events create deep mental health, academic, and economic ripples that can affect individuals and communities for years to come.

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Mental Health

Exposed students have higher risks of posttraumatic stress disorder, anxiety, depression, and substance abuse. Research shows that antidepressant prescriptions for youth living near schools that have had a shooting increased by over 21% in the years following an event. The psychological impact goes beyond those directly present. Children exposed to gun violence may experience serious adverse effects, including anxiety, PTSD, suicide risk, and substance use issues.

Academic Performance

School shootings can lead to a drop in graduation rates.

Economic Consequences

The long-term financial impacts go into adulthood: Shooting-exposed students are less likely to be employed in their mid-20s. One study estimated that cohorts of exposed students lose around $100,000 each in lifetime earnings. School shootings also contribute to teacher turnover and difficulty hiring and retaining educators.

Student Exposure Rates

The rate of student exposure to school shootings has nearly tripled, with most of the increase occurring during the pandemic years (2020-2024). Delaware, the District of Columbia, Utah, Nevada, and Arkansas had the highest rates of students exposed to school shootings since the pandemic. The average yearly rate of exposure was 51 per 100,000 students from 2020-2024. The rate per 100,000 students was highest in Delaware (359), DC (356), Utah (166), Arkansas (130), and Nevada (127). Note that student exposure rates can vary greatly at the state level due to factors such as school student enrollment size and state population. For example, Delaware and DC had low student populations (under 200,000) from 2020 to 2024, making their exposure rates more volatile than in higher-population states, and a small number of shootings could produce a high rate.

Since 1999, Washington’s exposure rates have remained at or above national average exposure rates - including the state’s lowest average yearly rate in 2010-2014 (25 per 100,000 students) to the state’s highest average yearly rate in 2020-2024 (62). Similarly, Colorado, Maryland, North Carolina, and Nevada have often endured school shooting exposure rates that are higher than the national average rate. In contrast, Maine, Vermont, West Virginia, and Wyoming have had no student exposure to school shootings since 1999.

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Disparities in Exposure

Gunfire on school grounds occurs most often at schools with a high proportion of students of color-disproportionately affecting Black students. Children of color are far more likely to experience campus gun violence.

Prevention Strategies: A Multifaceted Approach

Schools, districts, and communities can implement a wide range of social and technological strategies to help prevent gun violence at schools.

Recognizing Warning Signs

The data on pre-attack behavior is striking. Most mass school shooters show behavioral red flags-fascination with prior shootings, violent ideation, or direct threats. Almost half of gun-owning parents think their kids don’t know where the guns are stored. Almost all mass school shooters shared threatening or concerning messages or images. More than 75% raised concern from others prior to the attacks. Bystanders saw warning signs in most documented active shooter cases.

Technological Solutions

AI gun detection, mass and emergency notification systems (ENS), and integrated security workflow automation.

School Resource Officers and Metal Detectors

Fifty-four percent of public schools reported having a sworn law enforcement officer (SLEO) such as a police officer or school resource officer on campus during the 2023-2024 school year. While many public schools report feeling that SLEOs have a positive impact on the school community, evidence that they reduce gun violence or school shootings is lacking. Further, among school shootings that involved a SLEO, several involved the officer shooting an unarmed student or staff member. Although nearly all (92%) public schools with SLEOs report that these officers carry a firearm, just over half of these schools have a written policy for firearm handling expectations among SLEOs. Further, the placement of these officers on school campuses may negatively impact students of color specifically, as they are more likely to face disciplinary action than their White counterparts. Separately, 8% of public schools report having metal detectors at school gates for all or most students and 14% of public schools perform random metal detector checks on students. While these detectors are used as a security measure, there are not enough data to demonstrate that they decrease the risk of violent behavior on school grounds.

Active Shooter Drills

Other safety measures include written action plans and drills in the event of an active shooter, with the latter being linked to psychological harm among participants. While 98% of public schools had a written procedure to handle an active shooter during the 2023-2024 school year, only 27% of these schools reported feeling “very prepared” for an active shooter situation. Additionally, many public schools drill students on emergency lockdown and evacuation procedures for school shootings with varying degrees of intensity, with some being psychologically harmful to participants.

Broader Strategies

A KFF analysis found that states with more restrictive firearm laws generally have lower youth firearm morality than states with fewer firearm laws.

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