Why this question matters and how to answer it tonight
Which states can you see the northern lights tonight depends on solar activity, sky clarity, and how far south you are from the auroral oval. To answer accurately on any given day, check real-time forecast products that combine NOAA’s Ovation Aurora model, KP indices, and local cloud cover. This guide explains how those factors work, where to look, and how to interpret forecasts so you can decide quickly and confidently when auroral chances appear.
Aurora 101: what creates the northern lights
The aurora is caused by charged particles from the Sun interacting with Earth’s magnetic field and atmosphere. When solar wind and magnetic fields connect, particles are funneled toward the magnetic poles, where they excite oxygen and nitrogen, creating light. Activity is commonly described with the Kp index, a global geomagnetic scale from 0 (quiet) to 9 (extreme). Different Kp levels expand the auroral oval farther south, making displays visible at lower latitudes than usual.
Key terms to understand
- KP index: a measure of geomagnetic disturbance that indicates how far the auroral oval may extend
- Auroral oval: the ring-shaped region around each magnetic pole where auroras are most likely
- Ovation Aurora model: a forecast that maps expected auroral intensity by latitude and time
- Bz (north-south component of interplanetary magnetic field): southward Bz often improves auroral chances
- Dark sky and solar activity: both are necessary; low solar activity or daylight limit visibility regardless of forecast
How to check if you can see the northern lights tonight
To determine visibility for a specific state tonight, combine a reliable forecast with local conditions. Start with NOAA’s OVATION Aurora Forecast Product to see the predicted auroral oval edge and intensity for the current and coming hours. Then add a KP forecast and outlooks from space weather organizations. Finally, confirm local cloud cover, light pollution, and moon phase, because even strong auroral forecasts fail under thick clouds or bright skies.
Essential resources for a quick check
- NOAA Ovation Aurora forecast (swpc.noaa.gov): 30–60 minute intervals up to 3 hours ahead
- NOAA SWPC 3-day KP forecast and 27-day recurrence outlooks
- Current KP index from networks like NOAA’s DSCOVR or partners
- Local radar and satellite imagery for cloud cover and precipitation
- Light pollution maps to identify darker skies within each state
Which U.S. states can see the northern lights, and when
States closest to the Arctic Circle are most likely to see frequent auroras; southern states rarely see them except during strong geomagnetic storms. Visibility improves the farther north you are, and with higher KP indices. Below is a summary of typical visibility by state, ordered from most to least likely under average auroral conditions.
Typical visibility by state and KP level
| State | KP 1–2 (quiet) | KP 3 (unsettled) | KP 4 (active) | KP 5+ (storm) | ||||
|---|---|---|---|---|---|---|---|---|
| Alaska | Common northern regions | Frequent statewide | Widespread, bright | Strong, widespread | ||||
| Canada (near border) | Frequent northern horizon | Likely in northern areas | Common across region | Widespread, often overhead | ||||
| Washington (north) | Rare northern horizon | Possible north | Likely north, possible south | Statewide possible, bright | ||||
| Montana | Rare north | Occasional north | Possible most places | Widespread, bright | ||||
| Dakotas (North) | Occasional north | Likely north to central | Widespread | North Dakota | Rare north | Occasional north | Possible most places | Widespread, bright |
| Dakotas (South) | Rare | Occasional north | Possible north to central | Widespread possible | ||||
| Minnesota | Rare north | Occasional north | Likely northern 1/3–1/2 | Statewide possible, bright | ||||
| Michigan | Rare north | Occasional north | Northern Lower 1/3–1/2 | Widespread possible; UP more often | ||||
| Maine | Rare north | Occasional north | Northern and occasionally central | Widespread northern and possibly inland | ||||
| Wisconsin | Rare north | Occasional north | Northern and possibly central | Widespread northern and sometimes southern areas | ||||
| New York | Rare north | Occasional Adirondacks/north | Northern and occasionally central | Widespread possible, especially north | ||||
| Vermont | Rare north | Occasional north | more northern countiesPossible northern counties | |||||
| New Hampshire | Rare | Occasional far north | more northern countiesPossible northern counties | |||||
| Massachusetts | Rare | Very occasional far north | Uncommon, mostly far north | Possible northern counties | ||||
| New York (NYC area) | No | Very rare, only with extreme activity | Very rare; better north | Rare, only with extreme storms | ||||
| Pennsylvania | No | Very rare | Rare northern counties | Possible northern counties | ||||
| Iowa | No | Rare | Occasional northern counties | Possible northern counties | ||||
| Illinois | No | Rare | Occasional northern counties | Possible northern counties |
What KP 5+ storms can look like in the U.S.
During a KP 5+ geomagnetic storm, the auroral oval can expand to cover much of the northern U.S., making auroras visible as far south as the mid-Atlantic, Midwest, and even the Rockies under ideal conditions. Strong storms can produce vivid, dynamic displays overhead rather than just a glow on the northern horizon. Because these events are rarer and tied to coronal mass ejections, they’re less predictable but critically important to watch when they occur.
Interpreting forecast products: Ovation and beyond
NOAA’s Ovation Aurora forecast shows a real-time estimate of where auroral emissions are likely, based on satellite observations and models. Its color scale indicates intensity: higher probabilities and deeper colors (reds and yellows) mean brighter, more widespread auroras. A key takeaway is the outermost contour: if that edge reaches your latitude, there is potential—but cloud cover and local twilight still determine whether you can actually see it. Complement Ovation with SWPC’s Kp outlooks, DSCOVR’s real-time solar wind, and model guidance from organizations like the University of Alaska Fairbanks for the best picture.
Complement forecasts with local checks
- Current sky conditions via satellite and radar
- Hourly cloud forecasts for your precise location
- Moon phase and set times (a bright moon reduces contrast)
- Away from urban lighting to improve visibility
Practical steps to maximize your chances tonight
First, check the latest NOAA Ovation map and the current KP; if neither shows activity, you can reasonably conclude the northern lights are unlikely in your state. If forecasts show the edge of the oval approaching your latitude, plan to go out during the predicted peak hours, generally between 10 p.m. and 2 a.m. local time. Choose a location with a clear northern horizon, low light pollution, and shelter from wind. Give your eyes 20–30 minutes to dark adapt, and consider using a red flashlight. Finally, be patient: auroras can ramp up quickly, and short alerts can miss rapid changes, so check updates through the evening.
Common myths and limitations
No state in the contiguous U.S. has a guarantee of aurora visibility on any given night; even Alaska sees the best displays only during active periods. Forecasts express probabilities, not certainties, and small timing errors can shift the oval north or south. Human vision varies, and faint auroras may be missed without dark adaptation. Finally, auroral activity can surge with minutes’ notice during fast CME arrivals, so staying flexible and monitoring updates is part of the process.
Putting it all together for tonight
To answer which states can see the northern lights tonight in a reliable way: consult the real-time NOAA Ovation map and KP forecast, overlay local cloud cover, and compare with the table above for your state’s typical visibility at different Kp levels. If the forecast shows a KP of 4+ and the model edge reaches your latitude under a dark sky, your chances are meaningful. If conditions are uncertain, set up alerts from SWPC and local space weather services so you can react quickly if activity improves after sunset.