Northern Lights in MontanaVisible Tonight?
Real-time aurora forecast updated every 15 minutes
Kp 1.7 is well below the Kp 5 that Montana needs, so the aurora stays too far north tonight.
Verify with the live sky camera →No clear chance in the next 10 nights; forecasts update several times a day, so check back.
Tonight, Hour by Hour
The four things that must line up over Montana, and how each hour of the night looks.
Kp 1.7 now, Kp 5 needed here
0% cloud cover around 4 AM
Dark from 11 PM
Certified dark sky; moon 8% lit
All times shown in Montana local time (MDT), not your device time.
10-Night Aurora Outlook
Planning a trip to Montana? Peak activity, cloud cover, and darkness for the nights ahead.
Kp ~ marks nights beyond NOAA's precise 3-day forecast, estimated from the 27-day outlook. Treat the far nights as a rough guide, not a promise.
Seeing the aurora in Montana
The northern lights reach Montana more often than most people expect, and the northern edge of the state along the Canadian border is the front row. Glacier National Park has some of the darkest skies in the lower 48, and when a Kp 5 storm arrives the aurora climbs over Lake McDonald and the peaks of the Continental Divide.
Our verdict is not a Kp number. The Kp index is a global, three-hour average, and treating it as a promise is the single biggest reason people drive out and see nothing. Instead we check four things for Montana specifically: whether forecast activity reaches the level this latitude needs, whether the sky will be clear, whether it will actually be dark, and how much moonlight and local light pollution will wash out. Only when all four line up do we say yes.
When to go: aurora season in Montana
Aurora season in Montana runs from late August through mid-April. It is not that the sun quiets down in summer: the sky over northern Montana simply does not get fully dark for long enough near the June solstice, when the sun stays close to the horizon all night. The strongest months are historically around the equinoxes, September, October, and March, when Earth's magnetic field connects more efficiently with the solar wind and the same activity produces bigger displays.
Winter brings the longest, darkest nights and the best odds of a clear window between storms. Through the current solar maximum, northern Montana has been getting photographable aurora on a handful of nights in a typical month, and a few storms each year push naked-eye color well south of the border. Those big nights are exactly what the 10-night outlook above is for: when a Kp 6 or 7 storm is coming, it usually shows up there two or three days ahead.
Why Glacier National Park is Montana's aurora capital
Glacier National Park has the darkest skies and the highest latitude of any easy-to-reach spot in Montana. It sits near 48.7 degrees north on the Canadian border and carries a Bortle 1 rating in its remote corners, so faint aurora that a town would erase still shows here. Glacier is also an International Dark Sky Park, paired with Waterton Lakes in Alberta as the first transboundary dark-sky park in the world.
The park's big lakes are the other advantage: Lake McDonald, St. Mary Lake, and the North Fork lakes near Polebridge give you open water to the north and mirror reflections on calm nights. Remember that the high center of Going-to-the-Sun Road closes in winter, so in aurora season aim for Apgar and the foot of Lake McDonald on the west side or St. Mary on the east side, both reachable year-round.
How to read tonight's forecast like a local
From northern Montana you generally need Kp 5 for a naked-eye show and about Kp 4 for your camera to catch it; from the southern half of the state the bar rises to Kp 7 or more. Regulars know the Kp number is only the entry ticket: a clear north horizon and real darkness matter just as much, which is why the verdict above folds cloud cover and twilight into one answer instead of making you juggle three apps.
On a promising night, get out early, give it two full hours, and let your eyes dark-adapt for 15 minutes without looking at your phone. Displays arrive in substorms: bursts of 15 to 40 minutes with quiet gaps in between. Point night mode at the north horizon now and then; the camera will pick up an approaching display before your eyes do.