Sunrise and Sunset times in Boulder, United States 
Today:
 Sunrise: 07:51:56
|
 Sunset: 18:34:44
|
Day Length: 10h 42m 48s
Time zone: America/Denver, UTC -6 h.
Latitude: 46.2358, Longitude: -112.12
Boulder
☁️ Low chance of a spectacular sunset.
Montana, United States 
1 248 people
Current temperature 13 ° C 
Overcast
| Date | Sunrise | Solar Noon | Sunset | Day length |
|---|---|---|---|---|
| 2025-Oct-01, Wednesday | 07:27:44 | 13:17:57 | 19:08:09 | 11h 40m 25s |
| 2025-Oct-02, Thursday | 07:29:03 | 13:17:38 | 19:06:13 | 11h 37m 10s |
| 2025-Oct-03, Friday | 07:30:21 | 13:17:19 | 19:04:17 | 11h 33m 56s |
| 2025-Oct-04, Saturday | 07:31:40 | 13:17:01 | 19:02:21 | 11h 30m 41s |
| 2025-Oct-05, Sunday | 07:32:59 | 13:16:43 | 19:00:26 | 11h 27m 27s |
| 2025-Oct-06, Monday | 07:34:18 | 13:16:25 | 18:58:32 | 11h 24m 14s |
| 2025-Oct-07, Tuesday | 07:35:38 | 13:16:08 | 18:56:38 | 11h 21m 0s |
| 2025-Oct-08, Wednesday | 07:36:58 | 13:15:51 | 18:54:45 | 11h 17m 47s |
| 2025-Oct-09, Thursday | 07:38:18 | 13:15:35 | 18:52:52 | 11h 14m 34s |
| 2025-Oct-10, Friday | 07:39:38 | 13:15:19 | 18:51:00 | 11h 11m 22s |
| 2025-Oct-11, Saturday | 07:40:59 | 13:15:04 | 18:49:08 | 11h 8m 9s |
| 2025-Oct-12, Sunday | 07:42:20 | 13:14:49 | 18:47:17 | 11h 4m 57s |
| 2025-Oct-13, Monday | 07:43:41 | 13:14:34 | 18:45:27 | 11h 1m 46s |
| 2025-Oct-14, Tuesday | 07:45:03 | 13:14:21 | 18:43:38 | 10h 58m 35s |
| 2025-Oct-15, Wednesday | 07:46:25 | 13:14:07 | 18:41:49 | 10h 55m 24s |
| 2025-Oct-16, Thursday | 07:47:47 | 13:13:55 | 18:40:02 | 10h 52m 15s |
| 2025-Oct-17, Friday | 07:49:10 | 13:13:42 | 18:38:15 | 10h 49m 5s |
| 2025-Oct-18, Saturday | 07:50:33 | 13:13:31 | 18:36:29 | 10h 45m 56s |
| 2025-Oct-19, Sunday | 07:51:56 | 13:13:20 | 18:34:44 | 10h 42m 48s |
| 2025-Oct-20, Monday | 07:53:19 | 13:13:10 | 18:33:00 | 10h 39m 41s |
| 2025-Oct-21, Tuesday | 07:54:43 | 13:13:00 | 18:31:18 | 10h 36m 35s |
| 2025-Oct-22, Wednesday | 07:56:07 | 13:12:51 | 18:29:36 | 10h 33m 29s |
| 2025-Oct-23, Thursday | 07:57:31 | 13:12:43 | 18:27:55 | 10h 30m 24s |
| 2025-Oct-24, Friday | 07:58:56 | 13:12:36 | 18:26:15 | 10h 27m 19s |
| 2025-Oct-25, Saturday | 08:00:21 | 13:12:29 | 18:24:37 | 10h 24m 16s |
| 2025-Oct-26, Sunday | 08:01:46 | 13:12:23 | 18:23:00 | 10h 21m 14s |
| 2025-Oct-27, Monday | 08:03:11 | 13:12:18 | 18:21:24 | 10h 18m 13s |
| 2025-Oct-28, Tuesday | 08:04:37 | 13:12:13 | 18:19:49 | 10h 15m 12s |
| 2025-Oct-29, Wednesday | 08:06:02 | 13:12:09 | 18:18:16 | 10h 12m 14s |
| 2025-Oct-30, Thursday | 08:07:28 | 13:12:06 | 18:16:44 | 10h 9m 16s |
| 2025-Oct-31, Friday | 08:08:54 | 13:12:04 | 18:15:14 | 10h 6m 20s |
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