According to Harry K :

Ooops. Hit 'send' too soon. Your point about protecting the line from
freezing is very good. Only the line needs protecting though as the
pump won't freeze in a normal basement. Of course there are always
exceptions and in really severe climates, the pump itself might need
protecting.

The lines from our sumps are well above the frost line. Even
more so, in most sumps, the outlet is exposed directly to the
weather (which occasionally drops below -40F here).

The real key here is to ensure that you have a continuous
downwards slope in the line, so the portions of the line
exposed to freezing temperatures will self-drain.

And by avoiding the placement of the outlet in a puddle ;-)
--
Chris Lewis, Una confibula non set est
It's not just anyone who gets a Starship Cruiser class named after them.