The Sunny Side of Florida’s Unusual Cold Snap – How Invasive Species are Now Facing the “Heat”

By Taylor Marshall

This winter, Florida residents have been warned to carry an umbrella, not for rain –  but for the risk of a frozen iguana plummeting from the trees above. This January, a rare and powerful cold front swept the state of Florida, leading to unusual weather patterns statewide.

In January, the Florida Division of Emergency Management issued a warning for extreme wind chills, record-breaking low temperatures, and the possibility of plants and animals becoming frozen and stunned as a result of what has been described as Florida’s coldest weather outbreak in 15 years.

“Reptiles depend entirely on environmental heat to function,” said Jim Harlington, a senior reptile specialist at St. Augustine’s Alligator Farm Zoological Park. “When temperatures crash, their systems slow to the point that movement…and sometimes survival…becomes difficult. It’s a reminder that Florida’s ecosystems are more complex than many people realize.”

In addition to Florida’s native reptilian species, these unusual climate conditions could also disrupt the invasive reptile population in the state. Invasive reptiles make up approximately 35%-45% of all of Florida’s reptiles. This high and growing percentage has jeopardized Florida’s native species for decades.

Although Floridians are not pleased by this unusually cold weather, it may serve as a secret ecological solution to the issue of invasive species. Wildlife experts claim that these freezing temperatures may unintentionally slow the spread of invasive species that have altered Florida’s ecosystem for many generations.

Invasive reptiles such as green iguanas struggle to survive in extended cold weather. When the temperature drops below the 30s, these cold-blooded animals suffer from what scientists call brumation, or the slowing of their metabolisms. This physiological response causes the animal to stiffen or “freeze,” leaving them temporarily immobilized until the animal’s external temperature rises. This often results in iguanas plummeting from the trees overhead. If brumation persists for an extended amount of time, it can cause the animal’s organs to shut down, eventually leading to death.

According to the Florida Fish and Wildlife Conservation Commission (FWC), cold weather events can reduce the mobility of these invasive reptiles, making removal efforts significantly easier.

“Cold snaps provide a brief window where invasive reptiles are less mobile,” said David Steen, an FWC spokesperson. “That allows trained responders to safely capture animals that might otherwise evade control efforts.”

Wildlife managers are using this rare event as an opportunity to reinforce public awareness by warning Floridians to not attempt to handle stunned reptiles but instead contact professionals. Officials reiterate how responsible handling of these reptiles not only keeps the public and wildlife safe, but also allows conservationists to collect data and study these current events.

Florida’s Governor Ron DeSantis emphasized the ecological stakes in a public statement about how freezing temperatures are particularly dangerous for invasive reptiles that originate from tropical climates. Wildlife experts caution that although this year’s unusual freeze will temporarily suppress populations, it is not a long-term solution to this ongoing issue.

“These animals are incredibly resilient,” Steen with the FWC answered. “Cold weather may reduce numbers, but sustained management is still essential.”

For decades, Burmese pythons have been rupturing the predator-prey dynamic of South Florida, particularly in the Everglades National Park. These large predatory constrictors have contributed to the drastic population decline in several native mammal species, including foxes, raccoons, white-tailed deer, and even endangered species such as the Key Largo woodrat.

Wildlife specialists at St. Augustine’s Alligator Farm Zoological Park explain that the freeze shows how climate extremes can expose the biological limits invasive species have.

Ecologists also emphasize how freezing temperatures are a curb, not a cure, to the issue of invasive reptiles and that these temperatures are also harmful to Florida’s native wildlife species. The key difference between these species is evolutionary adaptations; native species are generally more tolerant to changes in their climates than their invasive counterparts, making them more resilient to the current extreme weather events.

In the long run, this unusual freeze will eventually thaw, but the challenge of ecological disruption will still remain. Florida’s struggle with invasive species is a persistent year-round issue. Efforts such as habitat monitoring, public education, and removal programs are among the attempts to restore Florida’s ecosystem to its former glory.