Aurora is visible from Wisconsin several times a year. In central Wisconsin the geomagnetic latitude is about 53°, so the northern lights usually need a Kp index of about 4.5 or higher to appear low on the northern horizon; the north of the state (around Devils Island Light) needs about Kp 3.5.
Kp needed (center)
Kp 4.5
geomag. lat 53°
Kp needed (north)
Kp 3.5
Devils Island Light
Kp needed (south)
Kp 5.5
Geneva Lake
Kp needed in Wisconsin cities
| City | Geomagnetic lat. | Kp needed | City sky |
|---|---|---|---|
| Milwaukee | 51.9° | Kp 5.5 | 7 |
| Madison | 51.8° | Kp 5.5 | 7 |
| Green Bay | 53.3° | Kp 4.5 | 7 |
| Kenosha | 51.4° | Kp 5.5 | 7 |
| Racine | 51.6° | Kp 5.5 | 7 |
| Appleton | 53.1° | Kp 4.5 | 7 |
| Waukesha | 51.8° | Kp 5.5 | 7 |
| Eau Claire | 53.4° | Kp 4.5 | 7 |
| Oshkosh | 52.8° | Kp 5.0 | 7 |
| Janesville | 51.4° | Kp 5.5 | 7 |
| West Allis | 51.8° | Kp 5.5 | 8 |
| La Crosse | 52.4° | Kp 5.0 | 7 |
| North La Crosse | 52.5° | Kp 5.0 | 7 |
| Sheboygan | 52.6° | Kp 5.0 | 7 |
| Wauwatosa | 51.9° | Kp 5.5 | 8 |
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 Wisconsin
| Location | Type | County | Est. Bortle |
|---|---|---|---|
| Newport State Park | Dark Sky Place | Door County | 2 |
| Rock Island State Park | State Park | Door County | 1 |
| Copper Falls State Park | State Park | Ashland County | 1 |
| Big Bay State Park | State Park | Ashland County | 1 |
| Governor Thompson State Park | State Park | Marinette County | 2 |
| Peninsula State Park | State Park | Door County | 2 |
| Brunet Island State Park | State Park | Chippewa County | 2 |
| Whitefish Dunes State Park | State Park | Door County | 2 |
| Pattison State Park | State Park | Douglas County | 3 |
| Amnicon Falls State Park | State Park | Douglas County | 3 |
| Straight Lake State Park | State Park | Polk County | 3 |
| Lac Vieux Desert | Lake | Vilas 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 Wisconsin?
Yes, several times a year. Central Wisconsin usually needs about Kp 4.5; the north about Kp 3.5.
What Kp index do I need?
Roughly Kp 4.5+ for central Wisconsin. 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 Wisconsin?
Dark sites with a clear northern view, such as Newport State Park, Rock Island State Park, Copper Falls State Park.