What Is Blue Hour Photography?
Blue hour is the period just after sunset (or just before sunrise) when the sun is below the horizon but the sky still holds a deep, even blue glow — distinct from both daylight and full darkness.
Why the sky turns blue
With the sun below the horizon, remaining sunlight scatters through the atmosphere in a way that favors blue wavelengths, producing an even, saturated blue tone across the whole sky rather than the warm colors of sunset.
Why it suits city and night portraits
Blue hour's cool ambient light pairs especially well with warm artificial lights (streetlights, building windows, neon signs) already turning on at that time, creating the same warm-cool contrast that defines a lot of cinematic photography.
Timing matters even more than golden hour
Blue hour is typically shorter and less forgiving than golden hour — often 20 minutes or less — so photographers who want it usually scout a location and plan the shot in advance.
Does blue hour happen at the same time every day?
No — its timing and duration shift with the seasons and your latitude, arriving later in summer and earlier in winter at most locations.
