Sunrise and sunset in Boulder, Colorado
6:33 AMsunrise in Boulder
November 3, 2026 · Boulder, Colorado
- Sunset
- 4:56 PM
- Daylight
- 10h 23m
- First light
- 6:04 AM
- Last light
- 5:24 PM
First light (civil dawn) is when it is light enough to be outdoors without lamps, and last light (civil dusk) is when that ends. Nautical twilight is when the horizon can still be seen at sea; after astronomical dusk the sky is fully dark. Calculated for Boulder, Colorado (40.02° N, 105.25° W, the Census Bureau's center point for the city) in Mountain Time. Times assume a level horizon at sea level; hills, buildings and weather can change what you see.
Daylight through 2026
| Date | Sunrise | Sunset | Daylight |
|---|---|---|---|
| January 1 | 7:23 AM | 4:47 PM | 9h 24m |
| February 1 | 7:09 AM | 5:20 PM | 10h 11m |
| March 1 | 6:34 AM | 5:53 PM | 11h 19m |
| April 1 | 6:45 AM | 7:25 PM | 12h 41m |
| May 1 | 6:01 AM | 7:56 PM | 13h 55m |
| June 1 | 5:34 AM | 8:24 PM | 14h 50m |
| July 1 | 5:36 AM | 8:34 PM | 14h 58m |
| August 1 | 6:00 AM | 8:15 PM | 14h 15m |
| September 1 | 6:29 AM | 7:32 PM | 13h 3m |
| October 1 | 6:57 AM | 6:43 PM | 11h 46m |
| November 1 | 6:30 AM | 4:58 PM | 10h 28m |
| December 1 | 7:04 AM | 4:36 PM | 9h 32m |
Twilight in Boulder
- Nautical dawn
- 5:32 AM
- Nautical dusk
- 5:56 PM
- Astronomical dawn
- 5:01 AM
- Astronomical dusk
- 6:28 PM
Sunrise and sunset in Boulder, day by day
| Date | Sunrise | Sunset | Daylight | Change |
|---|---|---|---|---|
| Sun, Nov 1 (clocks go back) | 6:30 AM | 4:58 PM | 10h 28m | −2m 19s |
| Mon, Nov 2 | 6:31 AM | 4:57 PM | 10h 26m | −2m 18s |
| Tue, Nov 3 (today) | 6:33 AM | 4:56 PM | 10h 23m | −2m 17s |
| Wed, Nov 4 | 6:34 AM | 4:55 PM | 10h 21m | −2m 15s |
| Thu, Nov 5 | 6:35 AM | 4:54 PM | 10h 19m | −2m 14s |
| Fri, Nov 6 | 6:36 AM | 4:53 PM | 10h 17m | −2m 13s |
| Sat, Nov 7 | 6:37 AM | 4:52 PM | 10h 15m | −2m 11s |
| Sun, Nov 8 | 6:38 AM | 4:51 PM | 10h 12m | −2m 10s |
| Mon, Nov 9 | 6:39 AM | 4:50 PM | 10h 10m | −2m 8s |
| Tue, Nov 10 | 6:41 AM | 4:49 PM | 10h 8m | −2m 6s |
| Wed, Nov 11 | 6:42 AM | 4:48 PM | 10h 6m | −2m 5s |
| Thu, Nov 12 | 6:43 AM | 4:47 PM | 10h 4m | −2m 3s |
| Fri, Nov 13 | 6:44 AM | 4:46 PM | 10h 2m | −2m 1s |
| Sat, Nov 14 | 6:45 AM | 4:45 PM | 10h 0m | −1m 59s |
| Sun, Nov 15 | 6:46 AM | 4:44 PM | 9h 58m | −1m 57s |
| Mon, Nov 16 | 6:48 AM | 4:44 PM | 9h 56m | −1m 55s |
| Tue, Nov 17 | 6:49 AM | 4:43 PM | 9h 54m | −1m 53s |
| Wed, Nov 18 | 6:50 AM | 4:42 PM | 9h 52m | −1m 51s |
| Thu, Nov 19 | 6:51 AM | 4:42 PM | 9h 51m | −1m 48s |
| Fri, Nov 20 | 6:52 AM | 4:41 PM | 9h 49m | −1m 46s |
| Sat, Nov 21 | 6:53 AM | 4:40 PM | 9h 47m | −1m 44s |
| Sun, Nov 22 | 6:54 AM | 4:40 PM | 9h 45m | −1m 41s |
| Mon, Nov 23 | 6:55 AM | 4:39 PM | 9h 44m | −1m 39s |
| Tue, Nov 24 | 6:56 AM | 4:39 PM | 9h 42m | −1m 36s |
| Wed, Nov 25 | 6:58 AM | 4:38 PM | 9h 41m | −1m 33s |
| Thu, Nov 26 | 6:59 AM | 4:38 PM | 9h 39m | −1m 30s |
| Fri, Nov 27 | 7:00 AM | 4:37 PM | 9h 38m | −1m 28s |
| Sat, Nov 28 | 7:01 AM | 4:37 PM | 9h 36m | −1m 25s |
| Sun, Nov 29 | 7:02 AM | 4:37 PM | 9h 35m | −1m 22s |
| Mon, Nov 30 | 7:03 AM | 4:36 PM | 9h 34m | −1m 19s |
December 2026, day by day
| Date | Sunrise | Sunset | Daylight | Change |
|---|---|---|---|---|
| Tue, Dec 1 | 7:04 AM | 4:36 PM | 9h 32m | −1m 16s |
| Wed, Dec 2 | 7:05 AM | 4:36 PM | 9h 31m | −1m 12s |
| Thu, Dec 3 | 7:06 AM | 4:36 PM | 9h 30m | −1m 9s |
| Fri, Dec 4 | 7:07 AM | 4:36 PM | 9h 29m | −1m 6s |
| Sat, Dec 5 | 7:08 AM | 4:36 PM | 9h 28m | −1m 2s |
| Sun, Dec 6 | 7:09 AM | 4:35 PM | 9h 27m | −59s |
| Mon, Dec 7 | 7:10 AM | 4:35 PM | 9h 26m | −55s |
| Tue, Dec 8 | 7:10 AM | 4:35 PM | 9h 25m | −52s |
| Wed, Dec 9 | 7:11 AM | 4:36 PM | 9h 24m | −48s |
| Thu, Dec 10 | 7:12 AM | 4:36 PM | 9h 24m | −45s |
| Fri, Dec 11 | 7:13 AM | 4:36 PM | 9h 23m | −41s |
| Sat, Dec 12 | 7:14 AM | 4:36 PM | 9h 22m | −37s |
| Sun, Dec 13 | 7:14 AM | 4:36 PM | 9h 22m | −33s |
| Mon, Dec 14 | 7:15 AM | 4:36 PM | 9h 21m | −30s |
| Tue, Dec 15 | 7:16 AM | 4:37 PM | 9h 21m | −26s |
| Wed, Dec 16 | 7:17 AM | 4:37 PM | 9h 20m | −22s |
| Thu, Dec 17 | 7:17 AM | 4:37 PM | 9h 20m | −18s |
| Fri, Dec 18 | 7:18 AM | 4:38 PM | 9h 20m | −14s |
| Sat, Dec 19 | 7:18 AM | 4:38 PM | 9h 20m | −10s |
| Sun, Dec 20 | 7:19 AM | 4:39 PM | 9h 20m | −6s |
| Mon, Dec 21 | 7:19 AM | 4:39 PM | 9h 20m | −2s |
| Tue, Dec 22 | 7:20 AM | 4:40 PM | 9h 20m | +2s |
| Wed, Dec 23 | 7:20 AM | 4:40 PM | 9h 20m | +6s |
| Thu, Dec 24 | 7:21 AM | 4:41 PM | 9h 20m | +10s |
| Fri, Dec 25 | 7:21 AM | 4:41 PM | 9h 20m | +14s |
| Sat, Dec 26 | 7:22 AM | 4:42 PM | 9h 20m | +17s |
| Sun, Dec 27 | 7:22 AM | 4:43 PM | 9h 21m | +21s |
| Mon, Dec 28 | 7:22 AM | 4:43 PM | 9h 21m | +25s |
| Tue, Dec 29 | 7:22 AM | 4:44 PM | 9h 22m | +29s |
| Wed, Dec 30 | 7:23 AM | 4:45 PM | 9h 22m | +33s |
| Thu, Dec 31 | 7:23 AM | 4:46 PM | 9h 23m | +37s |
The year in Boulder, 2026
On Tuesday, November 3, Boulder gets 2 minutes 17 seconds less daylight than the day before.
The earliest sunset is on Monday, December 7, 14 days before the shortest day, so the evenings start getting lighter while the mornings are still getting darker.
When the clocks went forward on Sunday, March 8, sunset moved from 6:00 PM the day before to 7:01 PM.
When the clocks went back on Sunday, November 1, sunset moved from 6:00 PM the day before to 4:58 PM.
| Date | Time | |
|---|---|---|
| Earliest sunrise | Sunday, June 14 | 5:32 AM |
| Latest sunrise | Saturday, October 31 | 7:29 AM |
| Earliest sunset | Monday, December 7 | 4:35 PM |
| Latest sunset | Saturday, June 27 | 8:34 PM |
| Longest day | Sunday, June 21 | 15h 1m |
| Shortest day | Monday, December 21 | 9h 20m |
Nearby: Longmont (12 mi) · Westminster (14 mi) · Arvada (14 mi) · Thornton (18 mi)
Sunrise and sunset in other US cities · in world cities
The times are for Boulder's center point in the US Census Bureau's 2026 Gazetteer (40.0244, -105.2513), on Mountain Time (from the timezone-boundary-builder map, © OpenStreetMap contributors). Across a large city, sunrise and sunset can differ by a minute or more from one side to the other.