multirange types are awesome and Django is one of the best web frameworks out there. ORMs are sometimes in this category of really wanting to be a jack of all trades, and not always willing to be the king of certain things. For big features, django.contrib.postgis exists, but there are also some postgres-specific features that people aren't using quite yet (but may in the future).

Now you can define multirange types in django:

https://github.com/omarish/django-postgres-multirange