Northern lights in Colorado tonight
Colorado, USA · 48° magnetic latitude · Kp 6-7 threshold
Kp 1 is well below the Kp 6-7 threshold needed for aurora to be visible from Colorado.
7-day outlook for Colorado
Based on CME arrival predictions from NASA DONKI. Arrival times ±6 hours.
auroratonight.space
What Kp is needed here?
Colorado sits at a magnetic latitude of approximately 48°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 6-7 before the auroral oval expands far enough south to be visible from here.
At Kp 6-7, visibility is possible from Colorado 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 Colorado
Light pollution is the biggest obstacle after cloud cover. These sites give you the best dark northern horizon within reach.
Great Sand Dunes National Park
Get directions ↗Colorado's only designated International Dark Sky Park, sitting at 2340 m in the San Luis Valley. The valley floor is ringed by the Sangre de Cristo Mountains to the east and the San Juan range to the west, blocking ambient light from all directions. The dunes themselves give an open northern horizon with no light domes. Bortle 2 conditions. The park is about 240 miles from Denver via US-285 - roughly 4 hours. The altitude reduces atmospheric interference. Consistently rated one of the darkest accessible sites in the Rocky Mountain region.
Rocky Mountain National Park - Trail Ridge Road
Get directions ↗At 3713 m, Trail Ridge Road is the highest continuous paved road in the USA. Above treeline, the horizon is fully open to the north across the Never Summer Range. The elevation gives thinner atmosphere and darker skies than lower sites. The Kawuneeche Valley on the park's west side faces north with minimal ambient light. From the Alpine Visitor Centre area, you have 360-degree sky access. The park is 70 miles from Denver. Trail Ridge Road closes in winter (October to late May), but the eastern approaches near Estes Park give dark sky access year-round.
Bonny Lake State Park / Eastern Plains
Get directions ↗The Colorado eastern plains near Bonny Lake and the Kansas border give the flattest, darkest horizon in the state. At 40.0°N geographic latitude, the plains sit marginally farther north than Denver and give an open prairie sky with no mountains blocking northern views. The Pawnee National Grassland near Greeley is another eastern plains option. Both sit at Bortle 3-4, which is darker than most Colorado mountain sites that have scatter from resort lighting. About 2.5 hours from Denver.
Black Canyon of the Gunnison National Park
Get directions ↗A deep canyon in western Colorado at 2350 m elevation. The canyon rim gives an open northern sky and the park has minimal nearby light pollution. The South Rim Road is accessible year-round. In autumn, the South Rim's northern-facing positions give good sky access with the canyon walls as dramatic foreground. About 240 miles from Denver via US-50. Gunnison town to the east adds some light dome, but the canyon interior is genuinely dark.
Best time to see the northern lights in Colorado
At 48°N magnetic latitude, Colorado sits at the lower end of regular aurora territory. Only the deep mid-winter months of November through January offer nights dark enough for aurora to be visible, and only then when a significant geomagnetic storm pushes the auroral oval this far south.
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 Colorado's latitude.
Outside November through January, twilight is too bright for aurora viewing even during significant storms. The season is short, but the equinox months on either side of winter can extend it slightly when storm timing aligns.
Other USA aurora forecasts
Related pages
Northern Lights USA
USA-wide aurora forecast hub.
Read →Northern Lights Utah Tonight
Utah - Bryce Canyon Dark Sky Park, similar latitude.
Read →Northern Lights Wyoming Tonight
Wyoming - Yellowstone and Grand Teton at 2000 m, Kp 5-6.
Read →Northern Lights Montana Tonight
Montana - Glacier NP, slightly higher latitude and lower Kp threshold.
Read →What Is the Kp Index?
What Kp 6-7 means for viewing at ~48° geomagnetic latitude.
Read →Aurora photographs from Colorado
Real photos sourced from Wikimedia Commons.
Aurora over Colorado 
Aurora over Colorado 
Aurora over Colorado 
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