Aurora is visible from Illinois only during strong geomagnetic storms. In central Illinois the geomagnetic latitude is about 49°, so the northern lights usually need a Kp index of about 6.5 or higher to appear low on the northern horizon; the north of the state (around Charles Mound) needs about Kp 5.5.
Kp needed (center)
Kp 6.5
geomag. lat 49°
Kp needed (north)
Kp 5.5
Charles Mound
Kp needed (south)
Kp 8.5
Cypress Creek National Wildlife Refuge
Kp needed in Illinois cities
| City | Geomagnetic lat. | Kp needed | City sky |
|---|---|---|---|
| Chicago | 50.7° | Kp 6.0 | 9 |
| Aurora | 50.6° | Kp 6.0 | 8 |
| Rockford | 51.0° | Kp 5.5 | 7 |
| Joliet | 50.3° | Kp 6.0 | 8 |
| Naperville | 50.6° | Kp 6.0 | 8 |
| Peoria | 49.4° | Kp 6.5 | 8 |
| Springfield | 48.5° | Kp 7.0 | 7 |
| North Peoria | 49.5° | Kp 6.5 | 8 |
| Elgin | 50.8° | Kp 6.0 | 8 |
| Waukegan | 51.2° | Kp 5.5 | 8 |
| Champaign | 48.9° | Kp 7.0 | 8 |
| Cicero | 50.7° | Kp 6.0 | 9 |
| Bloomington | 49.3° | Kp 6.5 | 8 |
| Arlington Heights | 50.9° | Kp 6.0 | 9 |
| Evanston | 50.9° | Kp 6.0 | 9 |
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 Illinois
| Location | Type | County | Est. Bortle |
|---|---|---|---|
| Big River State Forest | State Park | Henderson County | 3 |
| Apple River Canyon State Park | State Park | Jo Daviess County | 3 |
| Hennepin Canal Parkway State Park | State Park | Bureau County | 3 |
| Snakeden Hollow State Fish and Wildlife Area | State Park | Knox County | 3 |
| Argyle Lake State Park | State Park | McDonough County | 3 |
| Port Louisa National Wildlife Refuge | National Wildlife Refuge | Mercer County | 3 |
| Mark Twain National Wildlife Refuge | National Wildlife Refuge | Mercer County | 3 |
| Midway | Ghost Town | Fulton County | 3 |
| Millville | Ghost Town | Jo Daviess County | 3 |
| Bourbonais | Ghost Town | Bureau County | 3 |
| Cameron National Wildlife Refuge | National Wildlife Refuge | Marshall County | 3 |
| Charles Mound | Mountain Peak | Jo Daviess County | 3 |
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 Illinois?
Yes, only during strong geomagnetic storms. Central Illinois usually needs about Kp 6.5; the north about Kp 5.5.
What Kp index do I need?
Roughly Kp 6.5+ for central Illinois. 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 Illinois?
Dark sites with a clear northern view, such as Big River State Forest, Apple River Canyon State Park, Hennepin Canal Parkway State Park.