Calculated sunrise, sunset, golden hour and blue hour times for Thornton, CO. Select a date to view the calculated light times.
The month-by-month table below is in this city's own local time. The live times above follow your device's timezone. Mountains, ridgelines and buildings can shorten the usable window — scout your horizon.
Terrain, buildings and weather can affect visible light. Check the horizon and conditions at the selected location.
In Thornton, sunset ranges from 4:34 PM in December to 8:32 PM in June. Every time on this page is calculated for Thornton's coordinates (39.868, -104.9719) and shown in America/Denver.
| Month | Sunrise | Sunset | Golden hour (evening) | Length | Daylight |
|---|---|---|---|---|---|
| January | 7:19 AM | 4:59 PM | 4:18 PM – 4:59 PM | 41 min | 9h 40m |
| February | 6:52 AM | 5:36 PM | 4:58 PM – 5:36 PM | 38 min | 10h 44m |
| March | 7:11 AM | 7:06 PM | 6:31 PM – 7:06 PM | 35 min | 11h 56m |
| April | 6:22 AM | 7:38 PM | 7:02 PM – 7:38 PM | 36 min | 13h 16m |
| May | 5:44 AM | 8:08 PM | 7:29 PM – 8:08 PM | 39 min | 14h 23m |
| June | 5:30 AM | 8:30 PM | 7:49 PM – 8:30 PM | 41 min | 14h 59m |
| July | 5:44 AM | 8:27 PM | 7:47 PM – 8:27 PM | 40 min | 14h 43m |
| August | 6:11 AM | 7:56 PM | 7:19 PM – 7:56 PM | 37 min | 13h 44m |
| September | 6:41 AM | 7:08 PM | 6:32 PM – 7:08 PM | 36 min | 12h 27m |
| October | 7:10 AM | 6:20 PM | 5:43 PM – 6:20 PM | 37 min | 11h 10m |
| November | 6:44 AM | 4:43 PM | 4:03 PM – 4:43 PM | 40 min | 9h 59m |
| December | 7:14 AM | 4:35 PM | 3:53 PM – 4:35 PM | 42 min | 9h 22m |
Golden hour is not the same length all year in Thornton. It is longest in December at about 42 minutes and shortest in March at about 35 minutes — a difference of 7 minutes of usable warm light per evening.
Thornton gets 5h 37m more daylight on the longest day than the shortest. Sunset moves from 4:35 PM in December to 8:30 PM in June, so an evening shoot that works in summer will be shooting in the dark at the same clock time in winter.
Blue hour follows sunset and is worth planning for separately: in June it runs until about 9:02 PM, and in December until about 5:06 PM.
Golden hour is the period near sunrise and sunset when the sun is low. Blue hour occurs before sunrise and after sunset. Calculated times vary with location and date; weather, terrain and buildings can affect visible light.
Kanyon Studio provides photography and video in San Diego. Location, lighting and scheduling are agreed for each shoot.