Sunrise and sunset in Boulder

Boulder Sunrise, Sunset and Moon in December 2026

Local time (MST)

Day length goes from 9 h 32 min on December 1 to 9 h 23 min on December 31. Sunrise moves from 7:04 AM to 7:23 AM and sunset from 4:36 PM to 4:46 PM.

Every day

Dawn and dusk are civil twilight (the sun 6 degrees below the horizon); golden hour starts when the evening sun is 6 degrees up; full dark is astronomical twilight, 18 degrees down. A blank moonrise or moonset means it falls on the next day.

DateDawnSunriseSunsetDuskGolden hourFull darkDay lengthChangeMoonMoonriseMoonset
Dec 16:34 AM7:04 AM4:36 PM5:06 PM3:54 PM6:13 PM9 h 32 minLast quarter, 53%12:37 PM
Dec 26:35 AM7:05 AM4:36 PM5:06 PM3:54 PM6:12 PM9 h 31 min-1.0 minLast quarter, 42%12:47 AM12:59 PM
Dec 36:36 AM7:06 AM4:36 PM5:06 PM3:54 PM6:12 PM9 h 30 min-1.0 minWaning crescent, 32%1:53 AM1:22 PM
Dec 46:37 AM7:07 AM4:36 PM5:06 PM3:53 PM6:12 PM9 h 29 min-1.0 minWaning crescent, 23%2:57 AM1:46 PM
Dec 56:38 AM7:08 AM4:36 PM5:06 PM3:53 PM6:12 PM9 h 28 min-1.0 minWaning crescent, 14%4:02 AM2:13 PM
Dec 66:38 AM7:09 AM4:36 PM5:06 PM3:53 PM6:12 PM9 h 27 min-1.0 minWaning crescent, 8%5:07 AM2:44 PM
Dec 76:39 AM7:10 AM4:36 PM5:06 PM3:53 PM6:13 PM9 h 26 min-1.0 minWaning crescent, 3%6:10 AM3:21 PM
Dec 86:40 AM7:10 AM4:36 PM5:06 PM3:53 PM6:13 PM9 h 26 min+0.0 minNew moon 5:52 PM7:11 AM4:04 PM
Dec 96:41 AM7:11 AM4:36 PM5:06 PM3:53 PM6:13 PM9 h 25 min-1.0 minNew moon, 0%8:06 AM4:55 PM
Dec 106:42 AM7:12 AM4:36 PM5:06 PM3:53 PM6:13 PM9 h 24 min-1.0 minWaxing crescent, 2%8:54 AM5:51 PM
Dec 116:43 AM7:13 AM4:36 PM5:06 PM3:53 PM6:13 PM9 h 23 min-1.0 minWaxing crescent, 6%9:34 AM6:51 PM
Dec 126:43 AM7:14 AM4:36 PM5:06 PM3:53 PM6:13 PM9 h 22 min-1.0 minWaxing crescent, 12%10:08 AM7:53 PM
Dec 136:44 AM7:14 AM4:36 PM5:07 PM3:53 PM6:14 PM9 h 22 min+0.0 minWaxing crescent, 20%10:36 AM8:55 PM
Dec 146:45 AM7:15 AM4:36 PM5:07 PM3:54 PM6:14 PM9 h 21 min-1.0 minWaxing crescent, 29%11:01 AM9:56 PM
Dec 156:45 AM7:16 AM4:37 PM5:07 PM3:54 PM6:14 PM9 h 21 min+0.0 minWaxing crescent, 39%11:23 AM10:58 PM
Dec 166:46 AM7:17 AM4:37 PM5:08 PM3:54 PM6:15 PM9 h 20 min-1.0 minFirst quarter 10:43 PM11:44 AM
Dec 176:47 AM7:17 AM4:37 PM5:08 PM3:54 PM6:15 PM9 h 20 min+0.0 minWaxing gibbous, 60%12:06 PM12:01 AM
Dec 186:47 AM7:18 AM4:38 PM5:08 PM3:55 PM6:15 PM9 h 20 min+0.0 minWaxing gibbous, 70%12:29 PM1:06 AM
Dec 196:48 AM7:18 AM4:38 PM5:09 PM3:55 PM6:16 PM9 h 20 min+0.0 minWaxing gibbous, 79%12:57 PM2:15 AM
Dec 206:48 AM7:19 AM4:39 PM5:09 PM3:56 PM6:16 PM9 h 20 min+0.0 minWaxing gibbous, 87%1:30 PM3:28 AM
Dec 216:49 AM7:20 AM4:39 PM5:10 PM3:56 PM6:17 PM9 h 19 min-1.0 minWaxing gibbous, 94%2:12 PM4:44 AM
Dec 226:49 AM7:20 AM4:40 PM5:10 PM3:57 PM6:17 PM9 h 20 min+1.0 minWaxing gibbous, 98%3:05 PM6:01 AM
Dec 236:50 AM7:20 AM4:40 PM5:11 PM3:57 PM6:18 PM9 h 20 min+0.0 minFull moon 6:28 PM4:12 PM7:13 AM
Dec 246:50 AM7:21 AM4:41 PM5:11 PM3:58 PM6:18 PM9 h 20 min+0.0 minFull moon, 100%5:29 PM8:14 AM
Dec 256:51 AM7:21 AM4:41 PM5:12 PM3:58 PM6:19 PM9 h 20 min+0.0 minWaning gibbous, 97%6:49 PM9:04 AM
Dec 266:51 AM7:22 AM4:42 PM5:13 PM3:59 PM6:20 PM9 h 20 min+0.0 minWaning gibbous, 93%8:09 PM9:42 AM
Dec 276:51 AM7:22 AM4:43 PM5:13 PM4:00 PM6:20 PM9 h 21 min+1.0 minWaning gibbous, 86%9:24 PM10:13 AM
Dec 286:52 AM7:22 AM4:43 PM5:14 PM4:00 PM6:21 PM9 h 21 min+0.0 minWaning gibbous, 78%10:36 PM10:40 AM
Dec 296:52 AM7:22 AM4:44 PM5:15 PM4:01 PM6:22 PM9 h 22 min+1.0 minWaning gibbous, 69%11:44 PM11:03 AM
Dec 306:52 AM7:23 AM4:45 PM5:15 PM4:02 PM6:22 PM9 h 22 min+0.0 minLast quarter 11:59 AM11:26 AM
Dec 316:52 AM7:23 AM4:46 PM5:16 PM4:03 PM6:23 PM9 h 23 min+1.0 minLast quarter, 48%12:50 AM11:50 AM

Other months

More

Sources

Computed with the NOAA solar position equations and the lunar methods of Meeus, Astronomical Algorithms, for a flat horizon; hills and buildings delay a real sunrise.