Stargaze Atlas

Great Falls, MT — light pollution & stargazing

Montana · Very poor — city glow · population 59,638

Great Falls, Montana has a light-pollution rating of about Bortle 8 — a city sky (very poor — city glow) — measured from VIIRS 2024 satellite night-lights at 56 nW/cm²/sr at the town center. The sky is bright enough to read by. Only the Moon, the planets, and the few brightest stars and clusters are visible — the constellations lose most of their fainter stars. The nearest genuinely darker skies are around Helena, MT (about 72 mi away, Bortle 7). Tonight's Moon phase, cloud cover, and aurora odds load live below, computed in your browser. This is a satellite upward-radiance proxy for planning, not a survey-grade sky-brightness measurement.

Stargazing in Great Falls tonight

Light-pollution reading Great Falls, MT · VIIRS 2024
Estimated Bortle class
8 of 9

City sky. A satellite upward-radiance proxy for planning — not a survey-grade sky-brightness reading.

VIIRS radiance (town center)
56 nW/cm²/sr
Naked-eye limiting mag.
4.1–4.5
Milky Way
not visible

What you can see from Great Falls

The sky is bright enough to read by. Only the Moon, the planets, and the few brightest stars and clusters are visible — the constellations lose most of their fainter stars.

Darker skies within reach

The nearest town in each darker class — your ladder from Great Falls's sky toward truly dark skies.

Nearer, darker towns from Great Falls — nearest first.
Town State Bortle Sky Drive
Helena MT 7 Suburban / urban transition 72 mi
Ammon ID 6 Bright suburban sky 280 mi
Conda ID 4 Rural / suburban transition 330 mi

Frequently asked questions

Can you see the Milky Way from Great Falls, MT?
Not really. At about Bortle 8 the Milky Way is not visible from Great Falls — the sky is too light-polluted. The nearest genuinely dark skies are around Helena, MT, about 72 mi away.
How dark is the sky in Great Falls?
Great Falls rates a city sky — about Bortle 8, with a naked-eye limiting magnitude around 4.1–4.5. That comes from a VIIRS satellite night-lights reading of 56 nW/cm²/sr at the town center. It is a satellite proxy for planning, not a survey-grade measurement.
Where is the nearest dark sky to Great Falls?
The nearest town with genuinely darker skies is Helena, MT — about 72 mi away at roughly Bortle 7. See the "darker skies within reach" list on this page for more options.
Can I see the aurora from Great Falls tonight?
It depends on tonight's space weather. The live panel on this page reads the current NOAA aurora forecast for your latitude, along with cloud cover and the Moon — most U.S. locations only see aurora during strong geomagnetic storms.
How to read this rating

The darkness rating is measured from VIIRS satellite night-lights at the town center and is a proxy for planning, not a survey-grade sky-brightness measurement — and the darkest skies are usually a short drive out of any town. Tonight's Moon, cloud, and aurora figures are live third-party forecasts that can change. See the methodology for sources and limits.

More in Montana

See every town's darkness rating in Montana, learn to read the Bortle scale, or check tonight's Moon phase.