Yes, propane gas can freeze in cold temperatures, although it has a relatively low freezing point of -188.4 degrees Celsius (-307.1 degrees Fahrenheit).
However, when propane is in its liquid form, which is how it's typically stored and transported, it has a boiling point of -42.1 degrees Celsius (-43.8 degrees Fahrenheit) at atmospheric pressure. If the temperature drops below the boiling point, the liquid propane can start to vaporize and turn into a gas. This process can cause the propane tank or cylinder to become extremely cold, which can cause frost or ice to form on the exterior of the tank.
In addition, propane gas can also freeze inside the regulator or valves of the propane system, which can cause the system to malfunction or stop working altogether. To prevent this from happening, it's important to use propane in accordance with the manufacturer's recommendations and to keep the system protected from extreme cold temperatures