The SWPC, part of the National Oceanic and Atmospheric Administration (NOAA), created the map above to highlight the area where the aurora could reach. Though it says the "most likely area of aurora extent" will be between the yellow and green line, you're more likely to see it only reach as far south as the green line.
That's because the SWPC says the stronger portion of the storm -- the G2 watch -- will arrive between 2-5pm EST, you know, when it's still light outside. You're most likely to see the aurora in Montana, North Dakota, Minnesota, Wisconsin, Michigan, and Maine. Additionally, you should be able to spot it throughout Canada outside of small parts of southern Ontario, Quebec, and British Columbia. Though, if you're in the area as far south as the yellow line, which additionally includes Washington, Idaho, Montana, Wyoming, South Dakota, Iowa, Nebraska, Illinois, Indiana, Ohio, Pennsylvania, New York, Massachusetts, Vermont, and New Hampshire, it's possible you'll see the lights, but far from a guarantee.
Of course, the aurora should also be visible in Alaska, but that's nothing new. Parts of Alaska are among the best spots to go searching for the aurora.