How Fast Does a Car Heat Up? What We Know About the South Carolina Hot Car Case

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When a 9-year-old girl was found in a locked car at a South Carolina Home Depot on a hot summer day, her core body temperature had reached 104 degrees. First responders estimated this dangerous level had been reached within about 30 minutes of starting treatment. The case of 78-year-old June Cooper King, charged with unlawful conduct toward a child, raises a critical question: how quickly can a parked car become a health hazard?

The science is sobering. On a sunny 85-degree day, the inside of a car can reach 104 degrees in less than an hour. On hotter days, it climbs even faster. A child’s body heats up three to five times quicker than an adult’s, making them especially vulnerable to heat exhaustion and heat stroke. The grandmother told police she didn’t think her shopping trip would cause problems, but even a quick 15-minute errand can put a child at serious risk. Cracking windows provides minimal protection, and air conditioning shut off means the car becomes a trap.

Whether you’re a parent, grandparent, or caregiver, this incident is a stark reminder that children should never be left unattended in vehicles. If you’ve been in a situation where you’ve seen a child alone in a car, what would you do? And what laws in your community protect children from this kind of endangerment?