Land border point of entry into canada from montana?

Question

I would be driving from Chicago to Calgary Canada via Montana. I need to know the border post I would be driving through. Is it the

Port Of Entry-Sweetgrass Area Port or the Port Of Entry-Whitlash.

Thank you

Answer 1

whitlash one

Answer 2

According to this list of crossings, you could use both.  The Sweetgrass one is 24 hours though.