Aurora is visible from Montana several times a year. In central Montana the geomagnetic latitude is about 54°, so the northern lights usually need a Kp index of about 4.0 or higher to appear low on the northern horizon; the north of the state (around Lake Koocanusa) needs about Kp 3.5.
Kp needed (center)
Kp 4.0
geomag. lat 54°
Kp needed (north)
Kp 3.5
Lake Koocanusa
Kp needed (south)
Kp 5.5
Red Rock Lakes Wilderness
Kp needed in Montana cities
| City | Geomagnetic lat. | Kp needed | City sky |
|---|---|---|---|
| Billings | 52.9° | Kp 5.0 | 7 |
| Missoula | 53.4° | Kp 4.5 | 7 |
| Great Falls | 54.3° | Kp 4.0 | 7 |
| Bozeman | 52.5° | Kp 5.0 | 7 |
| Butte | 52.7° | Kp 5.0 | 6 |
| Helena | 53.3° | Kp 4.5 | 6 |
| Kalispell | 54.6° | Kp 4.0 | 6 |
Approximate Kp for aurora low on the northern horizon (camera-visible). Higher Kp lets it climb higher and show color to the eye.
Dark, northern photo locations in Montana
| Location | Type | County | Est. Bortle |
|---|---|---|---|
| Waterton-Glacier International Peace Park | Dark Sky Place | Glacier County | 1 |
| Bird Woman Falls Overlook | Scenic Viewpoint | Flathead County | 1 |
| Camas Creek Overlook | Scenic Viewpoint | Flathead County | 1 |
| McGee Meadow Overlook | Scenic Viewpoint | Flathead County | 1 |
| Lake Mary Ronan State Park | State Park | Lake County | 2 |
| West Shore State Park | State Park | Flathead County | 3 |
| Saint Mary Lake | Lake | Glacier County | 1 |
| Avalanche Lake | Lake | Flathead County | 1 |
| Lake McDonald | Lake | Flathead County | 1 |
| Swiftcurrent Lake | Lake | Glacier County | 1 |
| Upper Waterton Lake | Lake | Glacier County | 1 |
| Kintla Lake | Lake | Flathead County | 1 |
How to photograph the northern lights
- Watch the live Kp forecast above and NOAA's 30-minute aurora forecast; storms often peak between 10 p.m. and 2 a.m.
- Find an unobstructed view to the north — a lake, open field or ridge — away from town lights.
- Start at ISO 1600–3200, f/2.8 or faster, 5–15 seconds; shorter exposures keep fast-moving curtains sharp.
- Your camera sees aurora as green or red long before your eyes do — take test shots whenever Kp is near the threshold.
- Moonlight lights the foreground but washes out faint aurora; strong storms are still worth shooting under a bright moon.
FAQ
Can you see the northern lights in Montana?
Yes, several times a year. Central Montana usually needs about Kp 4.0; the north about Kp 3.5.
What Kp index do I need?
Roughly Kp 4.0+ for central Montana. Kp is a 0–9 scale of geomagnetic activity; each step moves the aurora's southern edge a few degrees of latitude.
Where is the best place to see the aurora in Montana?
Dark sites with a clear northern view, such as Waterton-Glacier International Peace Park, Bird Woman Falls Overlook, Camas Creek Overlook.