The blue hour is a period of twilight, typically occurring twice each day, just before sunrise and just after sunset.
The “Blue Hour” holds special significance in photography because of its unique lighting qualities, which are quite different from both the golden hour and daylight. Photographically, the blue hour marks a transition between day and night (or night and day). This in-between state is often used to convey loneliness, mystery, hope, or stillness. The blue hour is prized for its moody, balanced light that makes artificial lights stand out against a deep blue sky, allowing photographers to create images that feel both realistic and dreamlike.
When is the Blue Hour of the Day?
The blue hour happens twice a day. The term “hour” is a misnomer. This period typically lasts anywhere from 20 to 30 minutes, and in some cases, as little as 16-24 minutes.
The exact start and end times aren’t random. They are based on the sun’s position below the horizon.
| Blue Hour Timing Table | |
| Sun between 0° and 4° below horizon | This is the tail end of the golden hour. |
| Sun between 4° and 6° below horizon | This is the “blue hour”. The sky takes on a deep, even blue color. |
| Sun between 6° and 12° below horizon | This is civil twilight. The blue fades as the sky gets darker. |
A few key factors will change the blue hour’s timing and duration for your specific location. The blue hour is generally shorter near the equator (tropics) and longer in northern latitudes . In the summer, it may be very brief, while in winter, it can last longer.
Cloud cover and the amount of dust or moisture in the air can affect how the light scatters, altering the start time, duration, and richness of the blue color.
Why is the Blue Hour Matters in the Photography?
Unlike the harsh shadows of midday or the warm highlights of sunset, blue hour light is soft and evenly scattered. This reduces extreme contrast, making it easier to capture detail in both shadows and highlights (e.g., city lights against a darkening sky). The sky takes on rich blues, purples, and sometimes gradients of cyan and magenta near the horizon. These cool tones create a calm, serene, or melancholic mood which is perfect for storytelling images.
Artificial lights “pop” in the blue hour especially in cityscape photography. Natural ambient light is low enough that streetlights, windows, car trails, and signs become visible and distinct. The contrast between warm artificial light (yellow/orange) and the cool blue sky is visually striking and pleasing. The combination of twilight sky details (stars, clouds, silhouettes) with illuminated buildings and streets is often considered more dramatic than night shots (black sky) or daytime shots (harsh light).
Long exposures become more practical in the blue hour period of the day. The low light level allows for shutter speeds of several seconds to even minutes. This produces smooth water, streaking clouds, light trails from traffic, and a sense of motion which is highly valued in urban and landscape photography.