Sunrise and Sunset times in Boulder, United States 
Today:
 Sunrise: 07:43:55
|
 Sunset: 17:15:20
|
Day Length: 9h 31m 25s
Time zone: America/Denver, UTC -7 h.
Latitude: 42.7462, Longitude: -109.707
Boulder
Wyoming, United States 
| Date | Sunrise | Solar Noon | Sunset | Day length |
|---|---|---|---|---|
| 2026-Jan-01, Thursday | 07:49:13 | 12:22:32 | 16:55:51 | 9h 6m 38s |
| 2026-Jan-02, Friday | 07:49:16 | 12:23:00 | 16:56:44 | 9h 7m 28s |
| 2026-Jan-03, Saturday | 07:49:16 | 12:23:27 | 16:57:39 | 9h 8m 23s |
| 2026-Jan-04, Sunday | 07:49:14 | 12:23:55 | 16:58:36 | 9h 9m 22s |
| 2026-Jan-05, Monday | 07:49:09 | 12:24:21 | 16:59:34 | 9h 10m 25s |
| 2026-Jan-06, Tuesday | 07:49:02 | 12:24:48 | 17:00:34 | 9h 11m 32s |
| 2026-Jan-07, Wednesday | 07:48:52 | 12:25:14 | 17:01:35 | 9h 12m 43s |
| 2026-Jan-08, Thursday | 07:48:41 | 12:25:39 | 17:02:37 | 9h 13m 56s |
| 2026-Jan-09, Friday | 07:48:26 | 12:26:04 | 17:03:41 | 9h 15m 15s |
| 2026-Jan-10, Saturday | 07:48:10 | 12:26:28 | 17:04:46 | 9h 16m 36s |
| 2026-Jan-11, Sunday | 07:47:51 | 12:26:52 | 17:05:53 | 9h 18m 2s |
| 2026-Jan-12, Monday | 07:47:29 | 12:27:15 | 17:07:00 | 9h 19m 31s |
| 2026-Jan-13, Tuesday | 07:47:05 | 12:27:37 | 17:08:09 | 9h 21m 4s |
| 2026-Jan-14, Wednesday | 07:46:39 | 12:27:59 | 17:09:18 | 9h 22m 39s |
| 2026-Jan-15, Thursday | 07:46:11 | 12:28:20 | 17:10:29 | 9h 24m 18s |
| 2026-Jan-16, Friday | 07:45:40 | 12:28:40 | 17:11:41 | 9h 26m 1s |
| 2026-Jan-17, Saturday | 07:45:07 | 12:29:00 | 17:12:53 | 9h 27m 46s |
| 2026-Jan-18, Sunday | 07:44:32 | 12:29:19 | 17:14:06 | 9h 29m 34s |
| 2026-Jan-19, Monday | 07:43:55 | 12:29:38 | 17:15:20 | 9h 31m 25s |
| 2026-Jan-20, Tuesday | 07:43:15 | 12:29:55 | 17:16:35 | 9h 33m 20s |
| 2026-Jan-21, Wednesday | 07:42:34 | 12:30:12 | 17:17:50 | 9h 35m 16s |
| 2026-Jan-22, Thursday | 07:41:50 | 12:30:28 | 17:19:06 | 9h 37m 16s |
| 2026-Jan-23, Friday | 07:41:04 | 12:30:43 | 17:20:23 | 9h 39m 19s |
| 2026-Jan-24, Saturday | 07:40:16 | 12:30:58 | 17:21:40 | 9h 41m 24s |
| 2026-Jan-25, Sunday | 07:39:26 | 12:31:11 | 17:22:57 | 9h 43m 31s |
| 2026-Jan-26, Monday | 07:38:34 | 12:31:24 | 17:24:15 | 9h 45m 41s |
| 2026-Jan-27, Tuesday | 07:37:40 | 12:31:36 | 17:25:33 | 9h 47m 53s |
| 2026-Jan-28, Wednesday | 07:36:44 | 12:31:48 | 17:26:51 | 9h 50m 7s |
| 2026-Jan-29, Thursday | 07:35:46 | 12:31:58 | 17:28:10 | 9h 52m 24s |
| 2026-Jan-30, Friday | 07:34:47 | 12:32:08 | 17:29:29 | 9h 54m 42s |
| 2026-Jan-31, Saturday | 07:33:45 | 12:32:17 | 17:30:48 | 9h 57m 3s |
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