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 | 07:00:13 | 13:22:35 | 19:44:58 | 12h 44m 45s |
| 2026-Apr-02, Thursday | 06:58:29 | 13:22:18 | 19:46:06 | 12h 47m 37s |
| 2026-Apr-03, Friday | 06:56:45 | 13:22:00 | 19:47:15 | 12h 50m 30s |
| 2026-Apr-04, Saturday | 06:55:01 | 13:21:43 | 19:48:24 | 12h 53m 23s |
| 2026-Apr-05, Sunday | 06:53:18 | 13:21:25 | 19:49:33 | 12h 56m 15s |
| 2026-Apr-06, Monday | 06:51:35 | 13:21:08 | 19:50:41 | 12h 59m 6s |
| 2026-Apr-07, Tuesday | 06:49:53 | 13:20:52 | 19:51:50 | 13h 1m 57s |
| 2026-Apr-08, Wednesday | 06:48:11 | 13:20:35 | 19:52:59 | 13h 4m 48s |
| 2026-Apr-09, Thursday | 06:46:30 | 13:20:19 | 19:54:08 | 13h 7m 38s |
| 2026-Apr-10, Friday | 06:44:49 | 13:20:03 | 19:55:16 | 13h 10m 27s |
| 2026-Apr-11, Saturday | 06:43:09 | 13:19:47 | 19:56:25 | 13h 13m 16s |
| 2026-Apr-12, Sunday | 06:41:29 | 13:19:31 | 19:57:34 | 13h 16m 5s |
| 2026-Apr-13, Monday | 06:39:50 | 13:19:16 | 19:58:43 | 13h 18m 53s |
| 2026-Apr-14, Tuesday | 06:38:12 | 13:19:01 | 19:59:51 | 13h 21m 39s |
| 2026-Apr-15, Wednesday | 06:36:34 | 13:18:47 | 20:01:00 | 13h 24m 26s |
| 2026-Apr-16, Thursday | 06:34:57 | 13:18:33 | 20:02:09 | 13h 27m 12s |
| 2026-Apr-17, Friday | 06:33:21 | 13:18:19 | 20:03:18 | 13h 29m 57s |
| 2026-Apr-18, Saturday | 06:31:45 | 13:18:06 | 20:04:26 | 13h 32m 41s |
| 2026-Apr-19, Sunday | 06:30:10 | 13:17:53 | 20:05:35 | 13h 35m 25s |
| 2026-Apr-20, Monday | 06:28:37 | 13:17:40 | 20:06:44 | 13h 38m 7s |
| 2026-Apr-21, Tuesday | 06:27:04 | 13:17:28 | 20:07:53 | 13h 40m 49s |
| 2026-Apr-22, Wednesday | 06:25:32 | 13:17:16 | 20:09:01 | 13h 43m 29s |
| 2026-Apr-23, Thursday | 06:24:01 | 13:17:05 | 20:10:10 | 13h 46m 9s |
| 2026-Apr-24, Friday | 06:22:31 | 13:16:55 | 20:11:18 | 13h 48m 47s |
| 2026-Apr-25, Saturday | 06:21:01 | 13:16:44 | 20:12:27 | 13h 51m 26s |
| 2026-Apr-26, Sunday | 06:19:33 | 13:16:34 | 20:13:36 | 13h 54m 3s |
| 2026-Apr-27, Monday | 06:18:07 | 13:16:25 | 20:14:44 | 13h 56m 37s |
| 2026-Apr-28, Tuesday | 06:16:41 | 13:16:16 | 20:15:52 | 13h 59m 11s |
| 2026-Apr-29, Wednesday | 06:15:16 | 13:16:08 | 20:17:00 | 14h 1m 44s |
| 2026-Apr-30, Thursday | 06:13:53 | 13:16:01 | 20:18:08 | 14h 4m 15s |
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