Sunrise and Sunset times in Boulder, United States
Daily sun schedule, day length and annual chart
Select month and year
| Date | Sunrise | Solar Noon | Sunset | Day length |
|---|---|---|---|---|
| 2026-Apr-01, Wednesday | 06:44:14 | 13:04:46 | 19:25:19 | 12h 41m 5s |
| 2026-Apr-02, Thursday | 06:42:37 | 13:04:29 | 19:26:20 | 12h 43m 43s |
| 2026-Apr-03, Friday | 06:41:01 | 13:04:11 | 19:27:21 | 12h 46m 20s |
| 2026-Apr-04, Saturday | 06:39:26 | 13:03:54 | 19:28:21 | 12h 48m 55s |
| 2026-Apr-05, Sunday | 06:37:51 | 13:03:36 | 19:29:22 | 12h 51m 31s |
| 2026-Apr-06, Monday | 06:36:16 | 13:03:19 | 19:30:23 | 12h 54m 7s |
| 2026-Apr-07, Tuesday | 06:34:41 | 13:03:03 | 19:31:24 | 12h 56m 43s |
| 2026-Apr-08, Wednesday | 06:33:07 | 13:02:46 | 19:32:25 | 12h 59m 18s |
| 2026-Apr-09, Thursday | 06:31:34 | 13:02:30 | 19:33:25 | 13h 1m 51s |
| 2026-Apr-10, Friday | 06:30:01 | 13:02:14 | 19:34:26 | 13h 4m 25s |
| 2026-Apr-11, Saturday | 06:28:29 | 13:01:58 | 19:35:27 | 13h 6m 58s |
| 2026-Apr-12, Sunday | 06:26:57 | 13:01:42 | 19:36:28 | 13h 9m 31s |
| 2026-Apr-13, Monday | 06:25:26 | 13:01:27 | 19:37:29 | 13h 12m 3s |
| 2026-Apr-14, Tuesday | 06:23:55 | 13:01:12 | 19:38:30 | 13h 14m 35s |
| 2026-Apr-15, Wednesday | 06:22:25 | 13:00:58 | 19:39:31 | 13h 17m 6s |
| 2026-Apr-16, Thursday | 06:20:56 | 13:00:44 | 19:40:32 | 13h 19m 36s |
| 2026-Apr-17, Friday | 06:19:27 | 13:00:30 | 19:41:33 | 13h 22m 6s |
| 2026-Apr-18, Saturday | 06:18:00 | 13:00:17 | 19:42:34 | 13h 24m 34s |
| 2026-Apr-19, Sunday | 06:16:33 | 13:00:04 | 19:43:35 | 13h 27m 2s |
| 2026-Apr-20, Monday | 06:15:06 | 12:59:51 | 19:44:36 | 13h 29m 30s |
| 2026-Apr-21, Tuesday | 06:13:41 | 12:59:39 | 19:45:37 | 13h 31m 56s |
| 2026-Apr-22, Wednesday | 06:12:17 | 12:59:27 | 19:46:38 | 13h 34m 21s |
| 2026-Apr-23, Thursday | 06:10:53 | 12:59:16 | 19:47:39 | 13h 36m 46s |
| 2026-Apr-24, Friday | 06:09:31 | 12:59:05 | 19:48:40 | 13h 39m 9s |
| 2026-Apr-25, Saturday | 06:08:09 | 12:58:55 | 19:49:41 | 13h 41m 32s |
| 2026-Apr-26, Sunday | 06:06:49 | 12:58:45 | 19:50:42 | 13h 43m 53s |
| 2026-Apr-27, Monday | 06:05:29 | 12:58:36 | 19:51:43 | 13h 46m 14s |
| 2026-Apr-28, Tuesday | 06:04:11 | 12:58:27 | 19:52:44 | 13h 48m 33s |
| 2026-Apr-29, Wednesday | 06:02:54 | 12:58:19 | 19:53:45 | 13h 50m 51s |
| 2026-Apr-30, Thursday | 06:01:37 | 12:58:11 | 19:54:45 | 13h 53m 8s |
Day length in Boulder during the year on the chart
Boulder on United States map
Locations in the same time zone America/Denver
Denver (Colorado), Salt Lake City (Utah), El Paso (Texas), Albuquerque (New Mexico), Colorado Springs (Colorado), Ogden (Utah), Provo (Utah), Aurora (Colorado), Fort Collins (Colorado), Lakewood (Colorado), Pueblo (Colorado), Thornton (Colorado), Grand Junction (Colorado), West Valley City (Utah), Las Cruces (New Mexico), Greeley (Colorado), Billings (Montana), Arvada (Colorado), St. George (Utah), West Jordan (Utah), Westminster (Colorado), Centennial (Colorado), Santa Fe (New Mexico), Highlands Ranch (Colorado), Logan (Utah), Longmont (Colorado), Orem (Utah), Rio Rancho (New Mexico), Sandy (Utah), Lafayette (Colorado)
Largest populated areas in United States
New York (New York), Los Angeles (California), Chicago (Illinois), Miami (Florida), Dallas (Texas), Philadelphia (Pennsylvania), Houston (Texas), Washington (District of Columbia), Atlanta (Georgia), Boston (Massachusetts), Phoenix (Arizona), Seattle (Washington), San Francisco (California), Detroit (Michigan), San Diego (California), Minneapolis (Minnesota), Tampa (Florida), Denver (Colorado), Brooklyn (New York), Queens (New York), Baltimore (Maryland), Riverside (California), St. Louis (Missouri), Las Vegas (Nevada), Portland (Oregon), San Antonio (Texas), Sacramento (California), San Jose (California), Orlando (Florida), Cleveland (Ohio)
Countries closest to United States
*Calculation of distances from capital to capital
Daylight Hours FAQ: 10 Most Googled Questions Answered
Daylight hours refer to the period between sunrise and sunset. This duration changes throughout the year based on season and geographic location.
Earth's 23.5° axial tilt causes uneven sunlight distribution. Your hemisphere receives less direct sunlight in winter (shorter days) and more in summer (longer days).
Northern Hemisphere: June 20-22 (summer solstice).
Southern Hemisphere: December 21-23.
Near polar circles, the sun doesn't set for 24 hours.
Northern Hemisphere: December 21-22 (winter solstice).
Southern Hemisphere: June 20-21.
The closer to poles, the more extreme variations:
- Equator: ~12-hour days year-round
- Polar regions: Midnight sun/polar nights occur
Miami's lower latitude means:
- Winter days are longer than NY's
- Summer days are slightly shorter
During equinoxes:
- Spring: March 20-21
- Fall: September 22-23
Most rapid change near equinoxes: 2-4 minutes daily.
Slowest change near solstices: <1 minute daily.
Reliable tools:
- Timeanddate.com
- SunCalc.org
- Photographer's Ephemeris app
Yes. Reduced winter sunlight may cause:
- Seasonal Affective Disorder (SAD)
- Vitamin D deficiency
Solution: Light therapy lamps & midday walks