Northern lights Washington State tonight
Northern Washington sits at ~54°N magnetic latitude and needs Kp 5-6. The Okanogan Highlands east of the Cascades give dark dry skies facing north toward the Canadian border. North Cascades National Park is Bortle 2 when the highway is open. The Cascade rain shadow makes eastern Washington significantly clearer than the western slopes. Best season: September to April.
Aurora visibility — Washington State
Unlikely tonight
Kp 1 is well below the Kp 5–6 threshold needed for aurora to be visible from Washington State.
Current Kp
1
of 9
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
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
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
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.
Other USA aurora forecasts
Related pages
Northern Lights USA
USA-wide aurora forecast hub.
Northern Lights Oregon Tonight
Oregon - Crater Lake Dark Sky Park, similar latitude.
Northern Lights Idaho Tonight
Idaho - Craters of the Moon and Lake Pend Oreille, Kp 5.
What Is the Kp Index?
What Kp 5-6 means for viewing at 54°N magnetic latitude.
Northern Lights Viewing Tips
Dark site selection for Pacific Northwest aurora watching.
Common questions
Aurora in Washington State - Okanogan Highlands, Seattle visibility, and clear-sky strategy.