Northern lights in Washington State tonight
Northern Washington State, USA · 54° magnetic latitude · Kp 5–6 threshold
Kp 1 is well below the Kp 5–6 threshold needed for aurora to be visible from Washington State.
7-day outlook for Washington State
Based on CME arrival predictions from NASA DONKI. Arrival times ±6 hours.
auroratonight.space
What Kp is needed here?
Washington State sits at a magnetic latitude of approximately 54°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 5–6 before the auroral oval expands far enough south to be visible from here.
At Kp 5–6, visibility is possible from Washington State 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 Washington State
Light pollution is the biggest obstacle after cloud cover. These sites give you the best dark northern horizon within reach.
Methow Valley / Okanogan Highlands
Get directions ↗The Okanogan Highlands in north-central Washington near Tonasket and Republic sit at 900-1200 m elevation with minimal light pollution. The area faces north across the Canadian border with Bortle 2-3 conditions. Ferry County Road gives open ridge positions. The Methow Valley east of the Cascades near Winthrop offers comparable darkness with a more accessible valley floor. The rain shadow of the Cascades keeps this region significantly clearer than the western slopes. A 4-hour drive from Seattle via Highway 20.
North Cascades National Park
Get directions ↗The remote northern Cascades near the Canadian border, accessible via the North Cascades Highway (SR-20, closed in winter). The park sits at 48.7°N geographic and faces north across the Skagit range. Bortle 2 in the backcountry. The Ross Lake area in the park interior gives north-facing positions at lake level with mountain silhouette foreground. The Diablo Lake overlook gives a quick accessible position from SR-20. For aurora, the park's position close to the 49th parallel and deep darkness make it Washington's most compelling designated dark sky position.
Olympic Peninsula north coast
Get directions ↗The Strait of Juan de Fuca coastline between Port Angeles and Neah Bay faces north across open water toward Vancouver Island and the Canadian coastline. The Dungeness Spit and the cliffs near Neah Bay give north-facing positions with limited light pollution to the north. Hurricane Ridge in Olympic National Park at 1600 m gives elevated sky access. For aurora, the north-facing strait positions give an ocean horizon to the north with the aurora appearing above the distant Canadian coast.
Best time to see the northern lights in Washington State
At 54°N magnetic latitude, Washington State sits at the lower end of regular aurora territory. Only the deep mid-winter months of November through January offer nights dark enough for aurora to be visible, and only then when a significant geomagnetic storm pushes the auroral oval this far south.
Activity peaks around the September and March equinoxes, when Earth's magnetic field geometry is most favourable for coupling with the solar wind. Events during these two windows tend to produce the strongest displays of the year for observers at Washington State's latitude.
Outside November through January, twilight is too bright for aurora viewing even during significant storms. The season is short, but the equinox months on either side of winter can extend it slightly when storm timing aligns.
Other USA aurora forecasts
Up to 8 locations
How often does the aurora appear in Washington State?
Average nights per month the Kp reached Washington State's threshold of 5+, from 15 years of geomagnetic data (2010–2024).
Counts the Kp 5+ threshold only - cloud cover and local darkness are not included.
Kp data: GFZ German Research Centre for Geosciences, CC BY 4.0
Plan your trip to Washington State
Best window
The August to October window averages 4 aurora nights - the strongest consecutive stretch of the year.
How long to stay
Aurora at this latitude requires patience - allow as many nights as possible during March.
Related pages
Northern Lights USA
USA-wide aurora forecast hub.
Read →Northern Lights Oregon Tonight
Oregon - Crater Lake Dark Sky Park, similar latitude.
Read →Northern Lights Idaho Tonight
Idaho - Craters of the Moon and Lake Pend Oreille, Kp 5.
Read →What Is the Kp Index?
What Kp 5-6 means for viewing at 54°N magnetic latitude.
Read →Northern Lights Viewing Tips
Dark site selection for Pacific Northwest aurora watching.
Read →Aurora photographs from Washington State
Real photos sourced from Wikimedia Commons.
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