Pipes can freeze in the winter, but you never hear about fire hydrants freezing. What makes them safe from the cold temperatures in winter time?

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Sources:

http://www.todayifoundout.com/index.p...
http://media.cygnus.com/files/base/FH...
http://media.cygnus.com/files/base/FH...
https://www.livescience.com/43408-why...
https://www.plumbingsupply.com/reside...
http://www.firehydrant.org/info/faqs_...
https://books.google.com/books?id=GUX...

Images:

https://en.wikipedia.org/wiki/File:Do...
https://en.wikipedia.org/wiki/File:Dr...
https://commons.wikimedia.org/wiki/Fi...
https://commons.wikimedia.org/wiki/Fi...
https://commons.wikimedia.org/wiki/Fi...
https://en.wikipedia.org/wiki/File:18...
https://commons.wikimedia.org/wiki/Fi...