Lizards such as anoles have been known to thermo-regulate in temperatures just above freezing point within inches of icicles. Turtles and Crocodilians would likely either burrow (I have seen numerous Alligator and aquatic turtle digs next to lakes here in Florida). If the option presents, they may seek flowing water. A local creek becomes highly populated with aquatic snakes, turtles, and alligators in winter here. The reason is the water flows at a strong speed making it very difficult for humans to swim upriver - I have to use a rope to toss and pull if I don't have a kayak or canoe. Water bodies such as this, because of their flow and mountainous origins have a relatively constant temperature give or take just a few degrees Fahrenheit. Not to mention aquatic reptiles tend to be more capable of withstanding cooler temperatures. By staying in this water, basking on logs, and digging into mud-flats in the back-waters which heat up quick in the sun, many turtles, crocodilians, and aquatic snakes are able to forgo hibernation in areas such as Florida. Further north in areas like Tennessee, Missouri, Michigan, and Canada to name a few, snakes at least still seek shelter below the frost-line which usually means uphill sites above the water table.

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