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 | 07:10:13 | 13:29:29 | 19:48:45 | 12h 38m 32s |
| 2026-Apr-02, Thursday | 07:08:43 | 13:29:11 | 19:49:40 | 12h 40m 57s |
| 2026-Apr-03, Friday | 07:07:12 | 13:28:54 | 19:50:35 | 12h 43m 23s |
| 2026-Apr-04, Saturday | 07:05:42 | 13:28:37 | 19:51:31 | 12h 45m 49s |
| 2026-Apr-05, Sunday | 07:04:13 | 13:28:19 | 19:52:26 | 12h 48m 13s |
| 2026-Apr-06, Monday | 07:02:44 | 13:28:02 | 19:53:21 | 12h 50m 37s |
| 2026-Apr-07, Tuesday | 07:01:15 | 13:27:46 | 19:54:16 | 12h 53m 1s |
| 2026-Apr-08, Wednesday | 06:59:47 | 13:27:29 | 19:55:11 | 12h 55m 24s |
| 2026-Apr-09, Thursday | 06:58:19 | 13:27:13 | 19:56:06 | 12h 57m 47s |
| 2026-Apr-10, Friday | 06:56:52 | 13:26:57 | 19:57:02 | 13h 0m 10s |
| 2026-Apr-11, Saturday | 06:55:25 | 13:26:41 | 19:57:57 | 13h 2m 32s |
| 2026-Apr-12, Sunday | 06:53:59 | 13:26:25 | 19:58:52 | 13h 4m 53s |
| 2026-Apr-13, Monday | 06:52:33 | 13:26:10 | 19:59:47 | 13h 7m 14s |
| 2026-Apr-14, Tuesday | 06:51:08 | 13:25:55 | 20:00:43 | 13h 9m 35s |
| 2026-Apr-15, Wednesday | 06:49:44 | 13:25:41 | 20:01:38 | 13h 11m 54s |
| 2026-Apr-16, Thursday | 06:48:20 | 13:25:27 | 20:02:33 | 13h 14m 13s |
| 2026-Apr-17, Friday | 06:46:57 | 13:25:13 | 20:03:29 | 13h 16m 32s |
| 2026-Apr-18, Saturday | 06:45:35 | 13:25:00 | 20:04:24 | 13h 18m 49s |
| 2026-Apr-19, Sunday | 06:44:13 | 13:24:47 | 20:05:20 | 13h 21m 7s |
| 2026-Apr-20, Monday | 06:42:53 | 13:24:34 | 20:06:16 | 13h 23m 23s |
| 2026-Apr-21, Tuesday | 06:41:33 | 13:24:22 | 20:07:11 | 13h 25m 38s |
| 2026-Apr-22, Wednesday | 06:40:14 | 13:24:10 | 20:08:07 | 13h 27m 53s |
| 2026-Apr-23, Thursday | 06:38:56 | 13:23:59 | 20:09:02 | 13h 30m 6s |
| 2026-Apr-24, Friday | 06:37:39 | 13:23:48 | 20:09:58 | 13h 32m 19s |
| 2026-Apr-25, Saturday | 06:36:23 | 13:23:38 | 20:10:54 | 13h 34m 31s |
| 2026-Apr-26, Sunday | 06:35:07 | 13:23:28 | 20:11:49 | 13h 36m 42s |
| 2026-Apr-27, Monday | 06:33:53 | 13:23:19 | 20:12:45 | 13h 38m 52s |
| 2026-Apr-28, Tuesday | 06:32:40 | 13:23:10 | 20:13:41 | 13h 41m 1s |
| 2026-Apr-29, Wednesday | 06:31:28 | 13:23:02 | 20:14:36 | 13h 43m 8s |
| 2026-Apr-30, Thursday | 06:30:17 | 13:22:54 | 20:15:32 | 13h 45m 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