Northern Lights in Colorado Tonight
Can you see the northern lights in Colorado? Rarely, and then low on the northern horizon, in a big storm. At Kp 8 (G4) NOAA’s storm scale says: “aurora has been seen as low as Alabama and northern California (typically 45° geomagnetic lat.).” By NOAA’s rule Fort Collins, the farthest north of these towns, needs Kp 8 to see it low to the north and Kp 9 for it overhead; Denver, at magnetic latitude 47.3°, never has it overhead, since Kp 9 takes the oval’s edge only to 48°. Kp 8 or more comes on about 64 days in an 11-year solar cycle.
Type where you are: the Kp your spot needs, NOAA’s forecast for your dark hours tonight and the next two nights, the moon, and which way to look.
Fairbanks, AK · magnetic latitude 65.7°
You need Kp 0+By NOAA’s rule the aurora’s edge reaches Fairbanks at Kp 0+. Loading NOAA’s forecast for tonight…
- Kp you need
- 0+ overhead
- Look toward
- north-northeast
Kp forecast: NOAA Space Weather Prediction Center. Places: GeoNames.
The forecast above opens on Fort Collins, CO: type your own town, or use your location, for tonight’s answer where you are.
What Kp does Colorado need?
NOAA’s rule: “At Kp = 0, the equator ward edge of the auroral oval is approximately 66 degrees.” “And it moves equatorward about 2 degrees for each level of Kp.” That is in magnetic latitude — NOAA: “This relationship holds true in geomagnetic latitude, not geographic.” — so a town needs a Kp of (66 − its magnetic latitude) ÷ 2. In a big storm the aurora can also be seen from farther away, low on the horizon: NOAA’s storm scale says how low it “has been seen” at Kp 6 to 9.
| Town | Magnetic latitude | Kp overhead | Low on the horizon | Days per 11-year cycle | Look toward |
|---|---|---|---|---|---|
| Fort Collins, CO | 48.1° | 9 | Kp 8 (G4) | Kp ≥ 8: 64 | north |
| Denver, CO | 47.3° | more than 9 | Kp 8 (G4) | Kp ≥ 8: 64 | north |
| Colorado Springs, CO | 46.4° | more than 9 | Kp 8 (G4) | Kp ≥ 8: 64 | north |
| Grand Junction, CO | 46.2° | more than 9 | Kp 8 (G4) | Kp ≥ 8: 64 | north |
The farther toward the magnetic pole, the lower the Kp: Fort Collins needs the least of these towns and Grand Junction the most. NOAA adds a warning worth keeping: “It should be noted that the relationship between Kp and auroral latitude are approximate and represent averages.”
When is it dark enough in Colorado?
NOAA: “The aurora is not visible during daylight hours.” These are the hours with the Sun 12° or more below the horizon (the end of nautical twilight) on the night after the 15th of each month. “The best Seasons for aurora watching are around the spring and fall equinoxes.”
| Month | Fort Collins | Denver |
|---|---|---|
| January | 12.2 h | 12.2 h |
| February | 11.3 h | 11.3 h |
| March | 10.2 h | 10.2 h |
| April | 8.5 h | 8.8 h |
| May | 7.3 h | 7.3 h |
| June | 6.5 h | 6.5 h |
| July | 6.8 h | 7 h |
| August | 8 h | 8 h |
| September | 9.7 h | 9.7 h |
| October | 11 h | 11 h |
| November | 12 h | 12 h |
| December | 12.7 h | 12.5 h |
Plan it
- Things to do in Denver, Colorado
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- The best places in the world to see the northern lights
- Northern Lights Tonight: the forecast for any town
FAQ
Can you see the northern lights in Colorado?
Rarely: only in a strong storm, and on a dark, clear night. By NOAA’s rule Fort Collins needs Kp 8 to see the aurora low on the horizon and Kp 9 overhead. Kp 8 or more comes on about 64 days in an 11-year solar cycle (NOAA’s storm scale). At Kp 8 (G4) NOAA’s storm scale says: “aurora has been seen as low as Alabama and northern California (typically 45° geomagnetic lat.).”
Can I see the northern lights tonight in Colorado?
Only NOAA’s forecast for tonight can say: the tool at the top of this page reads it for Fort Collins (or your own town) and compares it with what Fort Collins needs: Kp 8 to see the aurora low on the horizon and Kp 9 overhead. Look north, away from city lights; NOAA: “Best aurora is usually within an hour or two of midnight (between 10 PM and 2 AM local time).”
When is the best time to see the northern lights in Colorado?
Fort Collins has its longest nights in December (12.7 hours of darkness). NOAA adds: “The best Seasons for aurora watching are around the spring and fall equinoxes.”
What Kp do you need to see the northern lights in Colorado?
Fort Collins, at magnetic latitude 48.1°: Kp 9 overhead, Kp 8 low on the horizon; Denver, at magnetic latitude 47.3°: no Kp overhead (Kp 9 takes the edge only to 48°), Kp 8 low on the horizon; Colorado Springs, at magnetic latitude 46.4°: no Kp overhead (Kp 9 takes the edge only to 48°), Kp 8 low on the horizon; Grand Junction, at magnetic latitude 46.2°: no Kp overhead (Kp 9 takes the edge only to 48°), Kp 8 low on the horizon. The rule is NOAA’s: the oval’s edge is at about 66° magnetic latitude at Kp 0 and moves about 2° toward the equator for each level of Kp.
Can you see the northern lights in Denver?
Rarely. By NOAA’s rule Denver needs Kp 8 to see the aurora low on the horizon, and no Kp puts it overhead. Kp 8 or more comes on about 64 days in an 11-year solar cycle (NOAA’s storm scale). Its own lights make it harder: NOAA says “Get away from city lights.”
How these numbers are made
Magnetic latitude is the dipole’s, with the pole from the IGRF-14 coefficients (NOAA NCEI / IAGA). The Kp overhead is NOAA’s rule, “low on the horizon” and the days per cycle are NOAA’s storm scale, and tonight’s Kp in the tool is NOAA’s 3-day forecast. Darkness is the Sun’s position, computed for 2026. Towns: GeoNames (CC BY 4.0). Rules checked 2026-09-27.