Without checking any reliable source, my instinct tells me this.

I graduated from high school. - Okay.

I graduated high school. - Okay, but probably not grammatically correct, perhaps colloquial or regional.

I graduated to college. - This just sounds wrong.

I graduated from high school to collegel. - Perhaps this is not officially correct, but it seems acceptable in my mind.


Of course, I could be wrong as I did not verify with any official or reliable sources.

There may also be regional variations, such as Americans will say, "He is in the hospital," while British speakers will say "He is in hospital."

I think the trickery involved here is based on the vast number of things you can now graduate from that you used to not be able to graduate from.

You were in schools, then you graduated. Everyone knew you were graduating from school. It likely didn't matter which school, because you only graduated once, and that meant you were twice as educated as everyone else in town.

Now, we graduate from kindergarten, we graduated from grade school, we graduate from junior high, we graduate from high school, we graduate from college… and in some cases, graduation is also like a promotion, advancement or a step up.

Graduation signifies completion. Therefore you graduate from something, you do not graduate TO something. Or maybe you just plain graduated. High school? No, college.

The second choice seems to be the most profound. That is what I would prefer to hear. Choice one seems defensive. Choice three seems like bait.

Graduate means literally "to take a degree". Since one may take a degree both from a place and to another place, both usages are correct. Leaving out the preposition is just laziness.