Yellowstone combines Bortle 2–3 dark sky with geothermal features unlike anywhere else on earth — geysers, hot springs, and fumaroles provide natural light sources and otherworldly foreground for night photography.
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Most thermal areas are strictly off-trail — stay on boardwalks at all times, especially in the dark. Grand Prismatic Spring from the Fairy Falls Overlook gives the best elevated view of the thermal basin. The geothermal features glow faintly in long exposures from their own heat — a natural light source that adds colour and warmth to compositions.
Season: May–October · Most roads closed November–April · New moon essential · Book accommodations months ahead
Gear notes: Bear spray mandatory, stay on boardwalks at thermal areas, serious layers for high elevation nights, book lodging early
Moon phase · Bortle 2–3 · Transparency · Cloud cover
Push alerts · Saved locations · 3-day outlook
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