As extreme heat intensifies across the American Southwest, a critical divide has emerged between Maricopa County’s proactive, resource-backed heat mitigation efforts and Clark County’s struggling response, offering vital lessons on preventing heat-related fatalities amidst climate change.
The desert Southwest has become a front line in the battle against rising temperatures, with extreme heat claiming more lives annually in the U.S. than any other weather event, including hurricanes, floods, and tornadoes, according to the National Weather Service. As climate change escalates the frequency and intensity of heat waves, the experiences of Maricopa County, Arizona, and Clark County, Nevada, offer a profound look into the strategies needed—and the severe human toll of their absence.
For over a decade, Dr. Jeffrey Johnston, chief medical examiner for Maricopa County, has witnessed a grim upward trend. Heat-related fatalities in the county surged from a few dozen in 2014 to a staggering 645 in 2023. These periods of extreme heat are now approached like “mass casualty events,” highlighting the overwhelming scale of the crisis.
Maricopa County’s Proactive Defense Against Extreme Heat
In the face of escalating heat deaths, Maricopa County, the most populous county in the desert Southwest, has committed significant resources to heat preparedness. Their investment has begun to yield critical results. Despite enduring a record 113 consecutive days at or above 100 degrees Fahrenheit in 2024—the hottest summer in recorded history for Phoenix—the county saw a decrease in heat fatalities, logging 602 deaths compared to 645 the previous year. Preliminary data for the current year indicates this downward trend is continuing, with 185 confirmed deaths so far, a significant reduction from 284 at the same point last year.
Key to Maricopa County’s success are several interconnected initiatives:
- 24/7 Cooling Centers: Initially, cooling centers, often libraries or community centers, closed after business hours. A survey revealed this left vulnerable populations exposed. In response, Phoenix opened 10 cooling centers that operate around the clock.
- Dedicated Leadership: The county created a full-time heat relief coordinator role in 2024, ensuring year-round focus on preparedness rather than reactive measures.
- Early Public Messaging: Proactive public outreach in both English and Spanish begins early each year, emphasizing the dangers of heat and necessary safety precautions.
- Meticulous Data Collection: Maricopa County maintains robust records of heat-related deaths, investigating cases where temperatures hit 95 degrees Fahrenheit or above as potential heat-related fatalities, ensuring the true scale of the problem is understood.
Dr. Nick Staab, chief medical officer for the county’s health department, emphasizes the philosophy behind these efforts: “Every one of these deaths is preventable.” This commitment underscores the belief that with the right strategies and resources, communities can effectively protect their residents.
Clark County’s Lagging Response and Urgent Catch-Up
A starkly different narrative unfolds in Clark County, Nevada, home to Las Vegas. Heat-related deaths here more than tripled in just three years, reaching a record 513 fatalities in 2024. This escalating crisis has finally jolted local officials into action, with public health preparedness manager Jeff Quinn describing recent summers as “slow-moving disasters.”
Hospitals and healthcare systems in Clark County frequently become overwhelmed during prolonged heat waves, straining resources and impacting their ability to respond to other emergencies. Despite being a “24/7 town” with businesses often open around the clock, Clark County’s primary heat mitigation efforts—its cooling centers—do not operate continuously due to limited resources. This logistical disconnect means that vulnerable populations may lose access to critical cooling during evening and weekend hours, precisely when they might need it most.
A survey by the Nevada Heat Lab, led by scientist Ariel Choinard, exposed a critical awareness gap: over 47% of people surveyed at cooling stations were unaware of their existence. This highlights not just a resource problem, but also a significant communication challenge. Choinard acknowledges Maricopa County’s head start: “They started the work around heat earlier than we have in this region, so in many ways they’re ahead of us.”
Clark County has begun to implement new strategies, inspired by its Arizona neighbor. This includes earlier public outreach campaigns about heat dangers and specific programs to improve access to cooling centers, such as free bus passes and ride-sharing services. The county also proactively stocks Narcan, an overdose-reversal drug, at its cooling centers, recognizing the link between substance use and heat-related vulnerability.
The Vulnerable and the Preventable Deaths
Both Maricopa and Clark counties share a common demographic vulnerability to extreme heat. Those most at risk are individuals who lack consistent access to air conditioning and adequate shelter. This includes:
- People experiencing homelessness: In Maricopa County, they accounted for 49% of heat-related deaths in 2023. In Clark County, at least 34% of heat deaths last year were among the homeless, a figure potentially higher due to unknown housing statuses.
- Residents of low-income neighborhoods and mobile homes: These communities often have less resilient infrastructure and higher rates of energy poverty.
- Outdoor workers: Prolonged exposure during peak heat hours.
- The elderly and individuals with pre-existing medical conditions: Their bodies struggle to regulate temperature effectively.
A significant link to substance use, particularly drugs and alcohol, was also found in both counties. In Maricopa County, 57% of heat-related deaths in 2023 involved substance use. These findings underscore the need for targeted, compassionate outreach that goes beyond simply providing cooling centers, addressing the multifaceted challenges faced by the most marginalized.
Funding the Fight Against a Fiery Future
A significant hurdle for both counties remains securing consistent and adequate funding for heat preparedness. Maricopa County has largely relied on money from the 2021 American Rescue Plan Act, but this crucial funding is set to expire after next year’s heat season. The looming loss of these funds poses a serious threat to the progress made.
In Clark County, federal grants and partnerships with non-profits like United Way have enabled programs like free bus passes to cooling centers. However, as Jeff Quinn noted, “that budget is fully exhausted in the first month of summer.” The precarious nature of this funding is exacerbated by political headwinds, with Quinn expressing concern about federal spending rollbacks for climate initiatives. The Nevada Heat Lab has also identified funding as a major challenge.
White House spokesman Kush Desai suggested focusing on “unleashing economic forms of American energy to reduce electricity costs for everyday Americans” as a solution. While this could alleviate some financial burden, it doesn’t directly address the immediate and comprehensive funding needed for public health infrastructure, emergency services, and dedicated personnel. Despite these challenges, Quinn remains resolute, understanding that “this threat isn’t going to go away. It will impact us regardless of who’s working on it or whether there’s funding or not. We just have to do our best with what limited resources we have.”
Lessons Learned and the Road Ahead
The contrasting outcomes in Maricopa and Clark counties present crucial lessons for communities nationwide grappling with increasing heat. Proactive planning, consistent year-round effort, comprehensive data collection, and dedicated funding are not luxuries but necessities. The success of 24/7 cooling centers and targeted outreach to vulnerable populations in Maricopa County demonstrates that effective mitigation is possible, even under record-breaking conditions. As Dr. Choinard stated, Maricopa County’s ability to reduce deaths in such a brutal summer is “really remarkable.”
However, the struggle for sustained funding and the need for adaptable, localized solutions remain paramount. The “one-size-fits-all” approach won’t work, but sharing best practices and securing robust financial support for public health initiatives are vital for building resilience against the relentless march of climate change and its deadly summers.
