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The aurora borealis — vibrant green ribbons of light dancing across a star-filled night sky over a snow-covered landscape, as seen from high-latitude locations

Aurora Guide · Colorado · Northern Lights

Northern Lights in Colorado: Where and When to See the Aurora Borealis

Colorado is one of the best states in the continental US for viewing the northern lights. The combination of high elevation — with over 50 peaks above 14,000 feet — exceptionally dark skies in the mountains, and a geographic latitude of 37–41°N means that Colorado sees aurora activity several times per year during strong geomagnetic storms. With Solar Cycle 25 peaking now, 2026 offers the best opportunity in over a decade to witness the aurora borealis from the Centennial State.

Kp neededKp 6–7 for visible aurora
Best monthsMarch–April & September–October
Top locationRocky Mountain National Park
Solar cycleCycle 25 peak — best since 2014
By Elena Reyes Published: Updated: Reviewed & approved by Juhi Sahni, Senior Editor Editorial Standards
Elena Reyes — Senior Science Editor

Elena Reyes

Senior Science Editor

Covers NASA missions, space science discoveries, and astronomical events for Telescope Advisor. Translates complex astrophysical research into practical insights for backyard observers. Based in the San Francisco Bay Area.

Can You Really See the Northern Lights in Colorado?

Yes — but not as frequently or as dramatically as in Alaska, Canada, or Scandinavia. Colorado sits between 37°N and 41°N latitude, which places it in the mid-latitude aurora zone. During minor geomagnetic storms (G1–G2, Kp 5–6), the aurora is typically visible only from the northernmost parts of the state under dark skies. During moderate to strong storms (G3+, Kp 7–9), the aurora can be seen across the entire state, including Denver's northern suburbs when conditions are optimal.

What makes Colorado special is its elevation. The aurora is a high-altitude phenomenon (typically 100–500 km above Earth's surface), and Colorado's average elevation of 6,800 feet puts observers significantly closer to the action. The thin, dry air at high altitude also means less atmospheric scattering and clearer views. During the May 2024 G5 geomagnetic storm — the strongest in over 20 years — aurora was visible across all of Colorado, with reports from as far south as Durango and Alamosa.

With Solar Cycle 25 currently at its peak, geomagnetic storm frequency is at its highest since 2014. This means Colorado will likely see 2–5 strong aurora events per year through 2027, making this an exceptional time to plan aurora-viewing trips to the state.

When to See the Aurora in Colorado

Timing is everything for aurora hunting in Colorado. Here are the key factors that determine success:

Season: Spring and Fall Are Best

The equinox months — March–April and September–October — statistically produce the most geomagnetic activity due to the Russell-McPherron effect, where the orientation of the Sun's magnetic field relative to Earth's aligns more favourably for aurora generation. These months also offer the most comfortable nighttime temperatures for extended outdoor viewing in Colorado, with less snow cover at lower elevations than midwinter.

Moon Phase: Avoid the Full Moon

The aurora is a relatively faint phenomenon. A bright moon will wash out all but the strongest displays. Plan your aurora hunts around the new moon or when the moon is below the horizon during peak viewing hours (10 PM – 2 AM local time). Check the moon phase calendar before heading out.

Time of Night: 10 PM to 2 AM

The aurora is most active around local midnight, when the solar wind interaction with Earth's magnetosphere is strongest. Arrive at your viewing location by 9 PM to allow your eyes to adapt to the dark, and plan to stay until at least 2 AM. Auroral activity often comes in waves — you may wait hours for a brief 15-minute display.

Best Locations for Aurora Viewing in Colorado

The key requirements for aurora viewing are dark skies (Bortle 3 or better), an unobstructed northern horizon, and clear weather. Colorado offers numerous world-class locations that meet all three criteria.

Rocky Mountain National Park (Bortle 2–3)

The park's high elevation (7,800–14,259 feet) and extremely dark skies make it Colorado's premier aurora destination. Trail Ridge Road offers easy access to viewpoints above treeline with panoramic northern horizons. The best spots are Many Parks Curve, Rainbow Curve, and the Alpine Visitor Center area. The park requires a timed-entry reservation from May–October — book in advance and be prepared for sub-freezing temperatures even in summer.

Jackson Lake State Park (Bortle 2)

Located about 1.5 hours northeast of Denver, Jackson Lake State Park is an International Dark Sky Park and one of the darkest accessible sites near the Front Range. The park's location on the eastern plains offers wide-open northern horizons ideal for aurora viewing. The park hosts regular astronomy programs and has an on-site observatory.

Great Sand Dunes National Park (Bortle 2)

An International Dark Sky Park with some of the darkest skies in the continental US. The vast dune field offers an otherworldly foreground for aurora photography. At 8,200 feet elevation, the air is thin and clear. The park is farther south (37.7°N), so aurora here requires stronger storms (Kp 7+), but the viewing experience when it happens is unmatched.

Pawnee National Grassland (Bortle 2–3)

Located about 1 hour northeast of Fort Collins, this vast grassland offers unobstructed 360-degree horizons and extremely dark skies. The Pawnee Buttes area is a popular spot for aurora photographers. The area is remote — bring all supplies, warm clothing, and a reliable vehicle.

How to Forecast Aurora Activity

Successful aurora hunting depends on accurate forecasting. You cannot just go out any night and hope to see the aurora — you need to track space weather in real time and be ready to move when conditions align.

Key forecasting tools:

  • NOAA SWPC 3-Day Forecast — The official 3-day geomagnetic storm forecast, updated every 6 hours. Look for G1–G3 watches for Colorado-visible aurora.
  • Kp-Index — The planetary K-index measures geomagnetic activity on a scale of 0–9. For Colorado: Kp 6 is visible from northern Colorado; Kp 7 is visible from Denver; Kp 8–9 covers the entire state.
  • OVATION Model — NOAA's real-time aurora prediction map shows the current and forecast aurora oval. If the oval dips below the Canadian border into the northern US, Colorado has a chance.
  • SpaceWeatherLive app — Sends push notifications for M-class and X-class solar flares and geomagnetic storm alerts. Essential for aurora chasers.

Photographing the Aurora in Colorado

Capturing the aurora on camera is easier than ever with modern equipment. A DSLR or mirrorless camera with a wide-angle lens (14–24mm) and a tripod is ideal. Use these settings as a starting point: manual focus set to infinity, aperture wide open (f/1.8 to f/2.8), ISO 1600–6400, and shutter speed 5–15 seconds depending on aurora brightness. Include foreground elements like mountains, trees, or the Great Sand Dunes for compositional interest.

For smartphone photographers, modern flagship phones (iPhone, Pixel, Samsung Galaxy) have dedicated night modes that can capture the aurora when held steady — ideally on a tripod. Use the widest available lens, set a 5–10 second exposure timer to avoid camera shake, and experiment with manual focus set to infinity if available. The results will not match a DSLR, but they will produce shareable images that document the experience. A remote shutter release or Bluetooth trigger is helpful for minimising vibration during long exposures.

Frequently Asked Questions

Can you see the northern lights in Colorado?

Yes, during strong geomagnetic storms (Kp 6+). Colorado sees aurora 2–5 times per year during Solar Cycle 25 peak, with the best views from high-elevation dark sky locations in the mountains.

What Kp index is needed for aurora in Colorado?

Kp 6 is typically needed for visible aurora from northern Colorado. Kp 7 extends visibility to Denver and most of the state. Kp 8–9 can make the aurora visible across all of Colorado.

Where is the best place to see the northern lights in Colorado?

Rocky Mountain National Park (Trail Ridge Road area) and Jackson Lake State Park offer the best combination of dark skies, high elevation, and unobstructed northern horizons.

What is the best time of year to see the northern lights in Colorado?

March–April and September–October offer the best combination of geomagnetic activity (equinox effect) and comfortable viewing temperatures. Avoid the full moon.

How do I forecast the aurora in Colorado?

Use the NOAA SWPC 3-day forecast, the OVATION aurora model, and the SpaceWeatherLive app. Look for Kp 6+ conditions combined with clear skies and a new moon.

How often does Colorado get the northern lights?

During Solar Cycle 25 peak (2025–2026), Colorado experiences visible aurora 2–5 times per year. During solar minimum, it may go 1–2 years without a visible event.