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Northern lights Duluth tonight

Duluth sits at 55° magnetic latitude on the western tip of Lake Superior. The Kp 4 threshold applies here - the lake's open water horizon gives unobstructed north-facing sky that few Great Lakes cities can match. Hawk Ridge and the lakefront are the go-to dark sky positions. Best season: September to April.

Aurora visibility - Duluth

Unlikely tonight

Kp 1 is well below the Kp 4 threshold needed for aurora to be visible from Duluth.

Current Kp

of 9

Threshold for Duluth: Kp 4 Magnetic latitude: ~55°N Updated: 15 May, 17:56 UTC

↓ Bz — nT Solar wind — km/s Density — p/cm³ ☁ —%

Conditions right now: — Kp + Bz + solar wind + cloud + moon

7-day outlook for Duluth

Today

15 May

Quiet

Tomorrow

16 May

Quiet

Sun

17 May

Quiet

Mon

18 May

Quiet

Tue

19 May

Quiet

Wed

20 May

Quiet

Thu

21 May

Quiet

Based on CME arrival predictions from NASA DONKI. Arrival times ±6 hours.

What Kp is needed here?

Duluth 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 4 before the auroral oval expands far enough south to be visible from here.

At Kp 4, visibility is possible from Duluth 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 Duluth

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

Canal Park and the Lakefront

North-facing directly over Lake Superior, with open water extending for miles and no light pollution across the lake surface. Walk east from the canal along the paved trail to leave the parking lot lighting behind. The wide unobstructed horizon makes this one of the most accessible aurora-watching spots in Duluth, five minutes from the downtown grid.

Hawk Ridge Nature Reserve

Elevated position at roughly 425 meters above the city, primarily known for fall raptor counts but also one of Duluth's best aurora viewpoints. The dark northern horizon opens over Lake Superior below. The ridge sits above the worst of the city light dome, and the drive up takes under 15 minutes from Canal Park.

Jay Cooke State Park

About 20 minutes south of Duluth off I-35, along the St. Louis River gorge. The old-growth forest corridor blocks road light, and the riverbanks face open sky above the canyon. No significant light sources in any direction from the interior trails. Best accessed from the swinging bridge trailhead off MN-210.

Best time to see the northern lights in Duluth

Duluth's aurora season runs from late September through to March, when nights are long enough for truly dark skies. The equinox months, September and March, bring a natural boost in geomagnetic activity, making them statistically the best of the season. Summer months bring too much twilight for aurora to be visible at this latitude.

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

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 Duluth's latitude.

April through August brings persistent astronomical twilight that washes out aurora completely. Even strong events (Kp 6+) remain invisible during this period because the sky never gets dark enough.

Other USA aurora forecasts

← USA overview

Marquette

Unlikely

Upper Peninsula, Presque Isle on Lake Superior

~55°N mag. lat. Kp 4

Minnesota

Unlikely

Boundary Waters, best dark sky in the northern lower 48

~56°N mag. lat. Kp 4-5

Michigan

Unlikely

Upper Peninsula, dark sky on Lake Superior

~55°N mag. lat. Kp 4-5

Northern Lights USA

USA-wide aurora forecast hub.

Northern Lights Marquette Tonight

Marquette - Lake Superior dark sky on Michigan's Upper Peninsula.

Northern Lights Minnesota

Minnesota statewide aurora forecast and dark sky locations.

Northern Lights Michigan UP

Michigan Upper Peninsula aurora guide, from Marquette to the Keweenaw.

What Is the Kp Index?

What Kp 4 means for aurora viewing at 55° magnetic latitude.

Common questions

Aurora watching from Duluth and the western Lake Superior shoreline.

What Kp is needed to see aurora from Duluth?

Duluth sits at about 55° magnetic latitude, so the threshold is Kp 4 - the Kp index being a global measure of geomagnetic activity on a scale from 0 (quiet) to 9 (extreme storm), updated every 3 hours. At Kp 4 from Hawk Ridge or the lakefront, aurora should be visible on the northern horizon. Kp 5 or higher pushes the auroral oval south enough to produce overhead displays and visible color. Kp 3 events occasionally produce faint arcs low on the horizon from the darkest spots.

Where are the best spots to watch aurora along the Duluth lakefront?

The stretch of shoreline east of the Aerial Lift Bridge faces north over open water with no land mass interrupting the horizon for roughly 150 miles. The paved Lakewalk trail runs from Canal Park northeast toward Leif Erikson Park, and light levels drop steadily as you move away from the parking lots and restaurant district. Brighton Beach, about 4 miles northeast via London Road, is a local favorite - gravel beach, no facilities at night, and significantly darker than the canal zone.

Is Duluth better than Marquette for aurora viewing?

Marquette has a modest advantage because it projects slightly further into Lake Superior, putting more dark water between the viewer and any Wisconsin light sources to the south. Both cities share the same 55° magnetic latitude threshold. The practical difference is usually cloud cover timing - Lake Superior weather moves quickly, and the two locations are often under different cloud systems. Checking both forecasts before a predicted event and driving to whichever city has clearer skies that night is a workable strategy for serious observers in the region.

How often is aurora visible from Duluth?

During an active solar maximum, Duluth typically sees around 20-30 nights per year with aurora activity reaching Kp 4 or above. Not all of those nights will be cloud-free - the Lake Superior shoreline averages significant cloud cover, particularly in fall and early winter. The most reliable window for clear skies is late winter through early spring, roughly February to April, when the region sees drier continental air masses more consistently.

What is the best time of year to watch aurora from Duluth?

The aurora season runs from September through April, when nights are long enough to allow adequate darkness. March and September are statistically the most geomagnetically active months due to the Russell-McPherron effect, which raises storm probability around the equinoxes. February and March tend to combine good geomagnetic odds with clearer skies than fall. Summer nights around Duluth are too short and too bright for reliable aurora viewing above 46°N geographic latitude.