galaxosCan you see the northern lights in Denver? Yes, but only during big solar storms. Denver needs about Kp 7 on the 0 to 9 scale of solar activity for a glow low in the northern sky, and activity reached that on 3 of the last 364 nights.
Aurora is unlikely tonight
NOAA expects tonight's Kp to peak around 1.7. Aurora here usually needs about Kp 7, so tonight is not the night.
As of 08:21 Denver time. Updated every 15 minutes.
Denver usually needs about Kp 7. Kp 1.7 is NOAA's forecast peak for tonight's dark hours here. Latest reading Kp 0.7 (12:00–15:00 UTC).
Kp is a 0 to 9 scale of how stirred up Earth's magnetic field is. The higher it goes, the further from the poles aurora reaches. More about Kp
Cloud over every dark hour, with no clear spell in the forecast. Even a strong display will be hidden. A clearer spot nearby may do better. Right now it's 14%.
The number is the average over tonight's dark hours; the verdict is judged hour by hour, so one clear evening does not hide an overcast midnight. Even a strong aurora is invisible through solid cloud.
Dark until 05:42. Aurora is usually best around midnight.
Dark enough means the sun is well below the horizon, which is later than sunset. At high latitudes in summer it never gets there.
Aurora usually becomes visible from here around Kp 7, and tonight is well below that. A strong substorm can bring it lower — treat this as a guide, not a cutoff.
Aurora appears in a ring around Earth's magnetic pole. The higher the Kp, the wider the ring grows. Inside it, aurora can show anywhere in the sky; outside it, you would see it low toward the north, if at all.
A guide, not a guarantee: aurora can beat the forecast or fall short of it, so don't plan a trip on this alone.
NOAA does not expect Kp to reach 7, the level Denver needs, in the next 2 nights.
| Day | From | Kp | Sky here |
|---|---|---|---|
| Fri 13 | 08:00 | 1.3 | Daylight |
| Fri 13 | 11:00 | 1.7 | Daylight |
| Fri 13 | 14:00 | 1.7 | Daylight |
| Fri 13 | 17:00 | 1.7 | Daylight |
| Fri 13 | 20:00 | 1.7 | Night |
| Fri 13 | 23:00 | 1.3 | Night |
| Sat 14 | 02:00 | 1.3 | Night |
| Sat 14 | 05:00 | 1.3 | Daylight |
| Sat 14 | 08:00 | 1.3 | Daylight |
| Sat 14 | 11:00 | 1.7 | Daylight |
| Sat 14 | 14:00 | 1.3 | Daylight |
| Sat 14 | 17:00 | 1.7 | Daylight |
| Sat 14 | 20:00 | 1.3 | Night |
| Sat 14 | 23:00 | 1.3 | Night |
| Sun 15 | 02:00 | 1.3 | Night |
| Sun 15 | 05:00 | 1.3 | Daylight |
| Sun 15 | 08:00 | 1.3 | Daylight |
| Sun 15 | 11:00 | 1.7 | Daylight |
| Sun 15 | 14:00 | 1.7 | Daylight |
| Sun 15 | 17:00 | 3.3 | Daylight |
One email when activity is forecast to climb high enough for the aurora in Denver. Nothing else.
Denver is near the southern edge of where the northern lights can be seen, so they show up only during strong solar storms, and usually low in the northern sky. The biggest problem is the glow over the metro area, which means heading out onto the plains to the northeast.
Look low to the north between 10 pm and 2 am; a phone camera often picks up colour your eyes miss.
The best months in Denver are August to April, with about 12 hours of real darkness a night.
What is Kp? A number from 0 to 9 for how stormy space weather is. Most nights are 1 to 3. At 5 or more it's a storm, and the northern lights spread much further south. More about Kp
3of the last 364 nights
Kp reached 7 or more during the night hours in Denver on 3 of the last 364 nights, about the level at which aurora comes into range here. The strongest night was January 19, 2026, when Kp reached 7.7. This counts activity, not sightings: cloud, moonlight and light summer nights decide how many of those nights anything could be seen.
| Month | Nights |
|---|---|
| Nov | 0 of 18 |
| Dec | 0 of 31 |
| Jan | 2 of 31 |
| Feb | 0 of 28 |
| Mar | 0 of 31 |
| Apr | 0 of 30 |
| May | 0 of 31 |
| Jun | 0 of 30 |
| Jul | 1 of 31 |
| Aug | 0 of 31 |
| Sep | 0 of 30 |
| Oct | 0 of 31 |
| Nov | 0 of 11 |
Kp index and forecast from NOAA SWPC. Cloud cover and sun times from Open-Meteo. Kp history from GFZ Potsdam (CC BY 4.0). Magnetic latitude is AACGM-v2, epoch 2026.