Sunrise and Sunset times in Boulder, United States 
Today:
 Sunrise: 07:18:51
|
 Sunset: 17:04:46
|
Day Length: 9h 45m 55s
Time zone: America/Denver, UTC -7 h.
Latitude: 40.0249, Longitude: -105.252
Boulder
Colorado, United States 
126 054 people
| Date | Sunrise | Solar Noon | Sunset | Day length |
|---|---|---|---|---|
| 2026-Jan-01, Thursday | 07:22:52 | 12:04:42 | 16:46:33 | 9h 23m 41s |
| 2026-Jan-02, Friday | 07:22:57 | 12:05:10 | 16:47:24 | 9h 24m 27s |
| 2026-Jan-03, Saturday | 07:23:00 | 12:05:38 | 16:48:16 | 9h 25m 16s |
| 2026-Jan-04, Sunday | 07:23:01 | 12:06:05 | 16:49:09 | 9h 26m 8s |
| 2026-Jan-05, Monday | 07:23:00 | 12:06:32 | 16:50:04 | 9h 27m 4s |
| 2026-Jan-06, Tuesday | 07:22:56 | 12:06:58 | 16:51:00 | 9h 28m 4s |
| 2026-Jan-07, Wednesday | 07:22:50 | 12:07:24 | 16:51:58 | 9h 29m 8s |
| 2026-Jan-08, Thursday | 07:22:42 | 12:07:49 | 16:52:56 | 9h 30m 14s |
| 2026-Jan-09, Friday | 07:22:32 | 12:08:14 | 16:53:56 | 9h 31m 24s |
| 2026-Jan-10, Saturday | 07:22:20 | 12:08:38 | 16:54:57 | 9h 32m 37s |
| 2026-Jan-11, Sunday | 07:22:05 | 12:09:02 | 16:55:59 | 9h 33m 54s |
| 2026-Jan-12, Monday | 07:21:48 | 12:09:25 | 16:57:02 | 9h 35m 14s |
| 2026-Jan-13, Tuesday | 07:21:29 | 12:09:48 | 16:58:06 | 9h 36m 37s |
| 2026-Jan-14, Wednesday | 07:21:08 | 12:10:09 | 16:59:11 | 9h 38m 3s |
| 2026-Jan-15, Thursday | 07:20:45 | 12:10:31 | 17:00:16 | 9h 39m 31s |
| 2026-Jan-16, Friday | 07:20:19 | 12:10:51 | 17:01:23 | 9h 41m 4s |
| 2026-Jan-17, Saturday | 07:19:52 | 12:11:11 | 17:02:30 | 9h 42m 38s |
| 2026-Jan-18, Sunday | 07:19:22 | 12:11:30 | 17:03:37 | 9h 44m 15s |
| 2026-Jan-19, Monday | 07:18:51 | 12:11:48 | 17:04:46 | 9h 45m 55s |
| 2026-Jan-20, Tuesday | 07:18:17 | 12:12:06 | 17:05:55 | 9h 47m 38s |
| 2026-Jan-21, Wednesday | 07:17:41 | 12:12:23 | 17:07:04 | 9h 49m 23s |
| 2026-Jan-22, Thursday | 07:17:03 | 12:12:39 | 17:08:14 | 9h 51m 11s |
| 2026-Jan-23, Friday | 07:16:23 | 12:12:54 | 17:09:24 | 9h 53m 1s |
| 2026-Jan-24, Saturday | 07:15:42 | 12:13:08 | 17:10:35 | 9h 54m 53s |
| 2026-Jan-25, Sunday | 07:14:58 | 12:13:22 | 17:11:46 | 9h 56m 48s |
| 2026-Jan-26, Monday | 07:14:13 | 12:13:35 | 17:12:58 | 9h 58m 45s |
| 2026-Jan-27, Tuesday | 07:13:25 | 12:13:47 | 17:14:09 | 10h 0m 44s |
| 2026-Jan-28, Wednesday | 07:12:36 | 12:13:58 | 17:15:21 | 10h 2m 45s |
| 2026-Jan-29, Thursday | 07:11:45 | 12:14:09 | 17:16:33 | 10h 4m 48s |
| 2026-Jan-30, Friday | 07:10:52 | 12:14:19 | 17:17:45 | 10h 6m 53s |
| 2026-Jan-31, Saturday | 07:09:58 | 12:14:27 | 17:18:57 | 10h 8m 59s |
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