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Northern lights Idaho tonight

Northern Idaho sits at ~55°N magnetic latitude and needs Kp 5. Lake Pend Oreille near Sandpoint faces north within 60 km of Canada. Craters of the Moon National Monument is a designated Dark Sky Park at 1900 m with Bortle 2-3 sky. The mountain west's clear skies give Idaho a practical aurora advantage over equivalent-latitude eastern states. Best season: September to April.

Aurora visibility — Idaho

Unlikely tonight

Kp 1 is well below the Kp 5 threshold needed for aurora to be visible from Idaho.

Current Kp

1

of 9

Threshold for Idaho: Kp 5 Magnetic latitude: ~55°N Updated: 11 May, 23:27 UTC

What Kp is needed here?

Idaho sits at a magnetic latitude of approximately 55°N. The Kp index - a global measure of geomagnetic activity on a scale from 0 (quiet) to 9 (extreme storm), updated every 3 hours - needs to reach Kp 5 before the auroral oval expands far enough south to be visible from here.

At Kp 5, visibility is possible from Idaho but skies need to be clear and dark. Cloud cover and light pollution remain the main obstacles even when Kp is high enough.

Best dark sky sites near Idaho

Light pollution is the biggest obstacle after cloud cover. These sites give you the best dark northern horizon within reach.

Craters of the Moon National Monument

A vast lava field in central Idaho designated an International Dark Sky Park. The monument sits at 1900 m elevation on the Snake River Plain with minimal horizon obstruction in all directions. Bortle 2-3 in the monument core. The flat lava landscape gives 360-degree open sky. Accessible from Arco on US-20. At ~53°N magnetic latitude the monument is slightly south of ideal, but the extreme darkness compensates. The NPS maintains a designated stargazing area. For strong Kp events (6+), the monument gives one of Idaho's best aurora platforms.

Lake Pend Oreille (Sandpoint)

The largest lake in Idaho, 60 km south of the Canadian border near Sandpoint. The lake's north shore faces across 80 km of open water toward the Selkirk Mountains. At 48.3°N geographic (55°N magnetic), this is Idaho's highest-latitude major dark sky position. Light pollution from Sandpoint is minimal on the north and east shores. The Hope Peninsula on the north shore gives an elevated north-facing position over the water. A 3-hour drive from Boise or 1.5 hours from Spokane.

Clearwater National Forest

A remote national forest in north-central Idaho covering 1.6 million acres of roadless wilderness east of Lewiston. Open ridges on the Bitterroot divide give north-facing sky at 1800-2000 m elevation. Bortle 2 in the deeper wilderness sections. The Powell Ranger District along US-12 gives highway-accessible positions. Minimal light pollution from any direction - no significant city within 100 km. The elevation reduces atmospheric haze, improving aurora visibility during active events.

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Washington State - North Cascades and Methow Valley.

What Is the Kp Index?

What Kp 5 means for viewing at 55°N magnetic latitude.

Northern Lights Viewing Tips

Dark site selection for mountain west aurora watching.

Common questions

Aurora in Idaho - Craters of the Moon, Lake Pend Oreille, and what Kp you need.

Can you see the northern lights in Idaho?
Yes, during moderate geomagnetic storms. Northern Idaho at ~55°N magnetic latitude needs Kp 5. Lake Pend Oreille near Sandpoint sits within 60 km of the Canadian border and gives the state's best combination of dark sky and northern latitude. Craters of the Moon National Monument in central Idaho gives an excellent dark sky platform for stronger events. The May 2024 G5 storm produced widespread Idaho sightings.
What Kp is needed for aurora in Idaho?
Kp 5 from northern Idaho - Lake Pend Oreille, the Clearwater mountains, and the north Idaho panhandle. Kp 6 for aurora visible from Coeur d'Alene or Moscow. Kp 7 for visibility from Boise. Northern Idaho's magnetic latitude (55°N) is comparable to Maine or Vermont, but the western US tends to have clearer skies, giving Idaho a practical advantage for aurora viewing in the lower 48.
What is the best dark sky site in Idaho for aurora?
Craters of the Moon National Monument for total darkness - a designated Dark Sky Park with Bortle 2-3 sky at 1900 m elevation. For northern latitude combined with darkness, Lake Pend Oreille near Sandpoint is closer to the Canadian border at 55°N magnetic. The Clearwater National Forest gives the most remote wilderness option. For a planned aurora chase on a strong event, Craters of the Moon and Lake Pend Oreille are the two principal targets.
When is the best time for aurora in Idaho?
September to April. Idaho's latitude gives around 14 hours of darkness in December. The equinox months of September and March are the most geomagnetically active. Idaho's mountain west location means autumn and spring bring clear, stable nights - often clearer than the equivalent period in the northern Midwest. Monitor NOAA space weather alerts for Kp 5+ and the National Weather Service Boise sky forecast.
How does Idaho compare to Montana for aurora?
Montana has the slight edge. At 55°N magnetic latitude both states are comparable, but Montana's northern Glacier National Park area sits slightly higher and has more extensive wilderness dark sky. Idaho's advantage is Craters of the Moon - an exceptional dark sky platform unavailable in Montana. For most practical purposes, a Kp 5 event is visible from dark sites in both states simultaneously. The choice between them comes down to which dark sky site you prefer.