If the super volcano in yellowstone would erupt, there would be ash all the way from Houston, TX, to Los Angeles, CA, to a bit south of Alberta, Canada. Mt. St. Helens may also get disturbed from the strong volcanic activity. There will be tons of earthquakes along the San Andreas Fault Line, and it may lead to the "Big One". Tons of tsunamis would form, affecting all regions along the ring of fire. Recently, researchers are saying that the greatest threat from the Yellowstone would be an earthquake greater than M7, affecting many regions in the US. The last time Yellowstone erupted (2.1 million years ago), it spattered ash all over the North American Continent.
So the answer to your question is unknown. It is certain that if the Yellowstone erupts, there will be lots of ash covered North America, but most likely at different concentrations. Also, some areas may be left out.
The farther you are from the volcano, it may not be as bad for you. That's common sense, tbh.