Sunrise and sunset times in Boulder, CO
Check out today's and tomorrow's sunrise and sunset times in Boulder, CO, United States, as well as the whole calendar for August 2026.
Today
August 20, 2026 . Current time: 10:46:24 pm
First light at 5:49:18 am
Sunrise time: 6:16:26 am
Sunset time: 7:52:22 pm
Last light at 8:19:30 pm
Day length: 13 hours, 35 minutes
Sunset in Boulder was 2 hours, 54 minutes ago
Moon rose on Aug 20 at 1:57 PM
Moon will set on Aug 20 at 10:52 PMMoon phase: 🌔 Waxing Gibbous (60%)🌕 Full moon: Aug 27 at 10:19 PM · 🌑 New moon: Sep 10 at 9:27 PMTomorrow
August 21, 2026
First light at 5:50:20 am
Sunrise time: 6:17:24 am
Sunset time: 7:50:55 pm
Last light at 8:17:58 pm
Day length: 13 hours, 33 minutes
Tomorrow will be 2 minutes shorter than today in Boulder
Moon will rise on Aug 21 at 2:55 PM Moon will set on Aug 21 at 11:39 PMMoon phase: 🌔 Waxing Gibbous (70%)
- Boulder, Colorado
- Latitude: 40.014984
- Longitude: -105.270546
- Time zone: Mountain Time MDT
Shortest day in Boulder, CO
The shortest day of the year will be in 4 months, during the winter solstice on December 21, 2026, with a daylight length of 9 hours and 22 minutes.Longest day in Boulder, CO
The longest day of the year was 2 months and 1 day ago, during the summer solstice on June 20, 2026, with a daylight length of 15 hours and 4 minutes.
August 2026 - Boulder, Colorado - Sunrise and sunset calendar
Sunrise and sunset times, civil twilight start and end times as well as solar noon, and day length for every day of August in Boulder.
The day length shortens by 1 hour, 9 minutes over the course of August 2026 in Boulder, CO - from 14 hours, 18 minutes on the first day to 13 hours, 8 minutes on the last day.
| Day | First Light | Sunrise | Sunset | Last Light | Day Length | Day Length Variation | Solar Noon
Time of day when the sun reaches its highest point in the sky.
|
Max Sun Altitude | Nautical Twilight Start | Nautical Twilight End | Astronomical Twilight Start | Astronomical Twilight End | Night Length
Calculated form this day's sunset to the next day's sunrise.
|
Moon phase |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sat, Aug 1 | 5:29:37 am | 5:58:22 am | 8:16:28 pm | 8:45:13 pm | 14h 18m 6s | 14h 18m 6s | 1:07:25 pm | 57.9° | 4:52:23 am | 9:22:27 pm | 4:11:30 am | 10:03:20 pm | 9h 42m 50s | 🌖 (93%) |
| Sun, Aug 2 | 5:30:39 am | 5:59:18 am | 8:15:23 pm | 8:44:03 pm | 14h 16m 5s | -2m -1s | 1:07:21 pm | 57.6° | 4:53:34 am | 9:21:08 pm | 4:12:56 am | 10:01:45 pm | 9h 44m 51s | 🌖 (87%) |
| Mon, Aug 3 | 5:31:40 am | 6:00:14 am | 8:14:17 pm | 8:42:51 pm | 14h 14m 3s | -2m -2s | 1:07:16 pm | 57.4° | 4:54:45 am | 9:19:47 pm | 4:14:23 am | 10:00:09 pm | 9h 46m 54s | 🌖 (79%) |
| Tue, Aug 4 | 5:32:42 am | 6:01:11 am | 8:13:10 pm | 8:41:38 pm | 14h 11m 59s | -2m -4s | 1:07:10 pm | 57.1° | 4:55:56 am | 9:18:24 pm | 4:15:49 am | 9:58:31 pm | 9h 48m 57s | 🌖 (70%) |
| Wed, Aug 5 | 5:33:44 am | 6:02:07 am | 8:12:01 pm | 8:40:24 pm | 14h 9m 54s | -2m -5s | 1:07:04 pm | 56.8° | 4:57:08 am | 9:17:01 pm | 4:17:15 am | 9:56:53 pm | 9h 51m 3s | 🌖 (59%) |
| Thu, Aug 6 | 5:34:46 am | 6:03:04 am | 8:10:51 pm | 8:39:09 pm | 14h 7m 47s | -2m -7s | 1:06:57 pm | 56.5° | 4:58:19 am | 9:15:36 pm | 4:18:42 am | 9:55:13 pm | 9h 53m 10s | 🌗 (48%) |
| Fri, Aug 7 | 5:35:49 am | 6:04:01 am | 8:09:39 pm | 8:37:52 pm | 14h 5m 38s | -2m -9s | 1:06:50 pm | 56.3° | 4:59:31 am | 9:14:10 pm | 4:20:08 am | 9:53:32 pm | 9h 55m 19s | 🌘 (37%) |
| Sat, Aug 8 | 5:36:51 am | 6:04:58 am | 8:08:26 pm | 8:36:33 pm | 14h 3m 28s | -2m -10s | 1:06:42 pm | 56° | 5:00:42 am | 9:12:42 pm | 4:21:34 am | 9:51:51 pm | 9h 57m 29s | 🌘 (26%) |
| Sun, Aug 9 | 5:37:53 am | 6:05:55 am | 8:07:12 pm | 8:35:14 pm | 14h 1m 17s | -2m -11s | 1:06:34 pm | 55.7° | 5:01:54 am | 9:11:14 pm | 4:23:00 am | 9:50:08 pm | 9h 59m 41s | 🌘 (17%) |
| Mon, Aug 10 | 5:38:56 am | 6:06:53 am | 8:05:57 pm | 8:33:53 pm | 13h 59m 4s | -2m -13s | 1:06:25 pm | 55.4° | 5:03:05 am | 9:09:44 pm | 4:24:25 am | 9:48:24 pm | 10h 1m 53s | 🌘 (9%) |
| Tue, Aug 11 | 5:39:58 am | 6:07:50 am | 8:04:40 pm | 8:32:32 pm | 13h 56m 50s | -2m -14s | 1:06:15 pm | 55.1° | 5:04:17 am | 9:08:13 pm | 4:25:50 am | 9:46:40 pm | 10h 4m 7s | 🌘 (3%) |
| Wed, Aug 12 | 5:41:01 am | 6:08:47 am | 8:03:22 pm | 8:31:09 pm | 13h 54m 35s | -2m -15s | 1:06:05 pm | 54.8° | 5:05:28 am | 9:06:42 pm | 4:27:15 am | 9:44:54 pm | 10h 6m 23s | 🌑 (0%) |
| Thu, Aug 13 | 5:42:03 am | 6:09:45 am | 8:02:04 pm | 8:29:45 pm | 13h 52m 19s | -2m -16s | 1:05:54 pm | 54.5° | 5:06:39 am | 9:05:09 pm | 4:28:40 am | 9:43:08 pm | 10h 8m 38s | 🌑 (0%) |
| Fri, Aug 14 | 5:43:06 am | 6:10:42 am | 8:00:43 pm | 8:28:20 pm | 13h 50m 1s | -2m -18s | 1:05:43 pm | 54.2° | 5:07:50 am | 9:03:35 pm | 4:30:04 am | 9:41:21 pm | 10h 10m 56s | 🌒 (3%) |
| Sat, Aug 15 | 5:44:08 am | 6:11:39 am | 7:59:22 pm | 8:26:54 pm | 13h 47m 43s | -2m -18s | 1:05:31 pm | 53.9° | 5:09:01 am | 9:02:01 pm | 4:31:28 am | 9:39:34 pm | 10h 13m 15s | 🌒 (8%) |
| Sun, Aug 16 | 5:45:10 am | 6:12:37 am | 7:58:00 pm | 8:25:27 pm | 13h 45m 23s | -2m -20s | 1:05:19 pm | 53.6° | 5:10:12 am | 9:00:25 pm | 4:32:51 am | 9:37:46 pm | 10h 15m 34s | 🌒 (15%) |
| Mon, Aug 17 | 5:46:13 am | 6:13:34 am | 7:56:37 pm | 8:23:59 pm | 13h 43m 3s | -2m -20s | 1:05:06 pm | 53.2° | 5:11:22 am | 8:58:49 pm | 4:34:14 am | 9:35:57 pm | 10h 17m 55s | 🌒 (23%) |
| Tue, Aug 18 | 5:47:15 am | 6:14:32 am | 7:55:13 pm | 8:22:30 pm | 13h 40m 41s | -2m -22s | 1:04:52 pm | 52.9° | 5:12:32 am | 8:57:12 pm | 4:35:37 am | 9:34:08 pm | 10h 20m 16s | 🌒 (32%) |
| Wed, Aug 19 | 5:48:17 am | 6:15:29 am | 7:53:48 pm | 8:21:00 pm | 13h 38m 19s | -2m -22s | 1:04:38 pm | 52.6° | 5:13:42 am | 8:55:35 pm | 4:36:59 am | 9:32:18 pm | 10h 22m 38s | 🌒 (42%) |
| Thu, Aug 20 | 5:49:18 am | 6:16:26 am | 7:52:22 pm | 8:19:30 pm | 13h 35m 56s | -2m -23s | 1:04:24 pm | 52.3° | 5:14:52 am | 8:53:56 pm | 4:38:20 am | 9:30:28 pm | 10h 25m 2s | 🌓 (51%) |
| Fri, Aug 21 | 5:50:20 am | 6:17:24 am | 7:50:55 pm | 8:17:58 pm | 13h 33m 31s | -2m -25s | 1:04:09 pm | 51.9° | 5:16:01 am | 8:52:17 pm | 4:39:41 am | 9:28:37 pm | 10h 27m 26s | 🌔 (61%) |
| Sat, Aug 22 | 5:51:22 am | 6:18:21 am | 7:49:27 pm | 8:16:26 pm | 13h 31m 6s | -2m -25s | 1:03:54 pm | 51.6° | 5:17:10 am | 8:50:37 pm | 4:41:02 am | 9:26:46 pm | 10h 29m 51s | 🌔 (70%) |
| Sun, Aug 23 | 5:52:23 am | 6:19:18 am | 7:47:58 pm | 8:14:53 pm | 13h 28m 40s | -2m -26s | 1:03:38 pm | 51.2° | 5:18:19 am | 8:48:57 pm | 4:42:22 am | 9:24:55 pm | 10h 32m 17s | 🌔 (78%) |
| Mon, Aug 24 | 5:53:25 am | 6:20:15 am | 7:46:29 pm | 8:13:20 pm | 13h 26m 14s | -2m -26s | 1:03:22 pm | 50.9° | 5:19:28 am | 8:47:16 pm | 4:43:41 am | 9:23:03 pm | 10h 34m 43s | 🌔 (85%) |
| Tue, Aug 25 | 5:54:26 am | 6:21:12 am | 7:44:59 pm | 8:11:45 pm | 13h 23m 47s | -2m -27s | 1:03:05 pm | 50.6° | 5:20:36 am | 8:45:35 pm | 4:45:00 am | 9:21:11 pm | 10h 37m 11s | 🌔 (92%) |
| Wed, Aug 26 | 5:55:27 am | 6:22:10 am | 7:43:28 pm | 8:10:10 pm | 13h 21m 18s | -2m -29s | 1:02:49 pm | 50.2° | 5:21:44 am | 8:43:53 pm | 4:46:19 am | 9:19:18 pm | 10h 39m 38s | 🌔 (96%) |
| Thu, Aug 27 | 5:56:28 am | 6:23:06 am | 7:41:56 pm | 8:08:35 pm | 13h 18m 50s | -2m -28s | 1:02:31 pm | 49.9° | 5:22:52 am | 8:42:11 pm | 4:47:36 am | 9:17:26 pm | 10h 42m 7s | 🌔 (99%) |
| Fri, Aug 28 | 5:57:28 am | 6:24:03 am | 7:40:23 pm | 8:06:59 pm | 13h 16m 20s | -2m -30s | 1:02:13 pm | 49.5° | 5:23:59 am | 8:40:28 pm | 4:48:54 am | 9:15:33 pm | 10h 44m 37s | 🌕 (100%) |
| Sat, Aug 29 | 5:58:29 am | 6:25:00 am | 7:38:50 pm | 8:05:22 pm | 13h 13m 50s | -2m -30s | 1:01:55 pm | 49.2° | 5:25:06 am | 8:38:45 pm | 4:50:10 am | 9:13:41 pm | 10h 47m 7s | 🌖 (99%) |
| Sun, Aug 30 | 5:59:29 am | 6:25:57 am | 7:37:17 pm | 8:03:45 pm | 13h 11m 20s | -2m -30s | 1:01:37 pm | 48.8° | 5:26:12 am | 8:37:01 pm | 4:51:26 am | 9:11:48 pm | 10h 49m 37s | 🌖 (95%) |
| Mon, Aug 31 | 6:00:29 am | 6:26:54 am | 7:35:43 pm | 8:02:07 pm | 13h 8m 49s | -2m -31s | 1:01:18 pm | 48.4° | 5:27:19 am | 8:35:18 pm | 4:52:42 am | 9:09:55 pm | 10h 52m 7s | 🌖 (90%) |
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Sunrise and Sunset photos in Boulder, CO
Enjoy this beautiful gallery of images of the sunset and sunrise at Boulder, CO. All images provided by our fantastic community of photographers!
Year distribution of sunrise and sunset times in Boulder, CO - 2026
The following graph shows sunrise and sunset times in Boulder, CO for every day of the year. There are two jumps in the graph that represent the hour change for Daylight Saving Time (DST) in Boulder, CO.
Daylight Dawn & dusk (civil twilight) Night Solar noon · Vertical steps in the curves = DST clock change
Earliest and latest sunrise and sunset in Boulder, CO
In Boulder, CO, the earliest sunrise of 2026 is on June 13 at 5:30 am, while the latest sunrise is on October 31 at 7:28 am. The earliest sunset is on December 7 at 4:37 pm, and the latest sunset is on June 27 at 8:35 pm.
Boulder, CO gets 5h 41m more daylight on the longest day than on the shortest one (15h 04m versus 9h 22m). Averaged over the whole year, a day lasts 12h 15m.
Places near Boulder, CO
These nearby towns and cities have almost the same sunrise and sunset times as Boulder, CO — the difference is only seconds to a couple of minutes. Select any place to see its own sun calendar:
Gunbarrel 10 kmSuperior 11 kmLouisville 12 kmNiwot 13 kmJamestown 15 kmCoal Creek 15 kmLafayette 16 kmBroomfield 19 km