Moon · October 2025
Moon calendar for Boulder, Colorado, United States: October 2025
Daily moon phases, illumination, moonrise and moonset in Boulder, Colorado, United States for October 2025. Full moon: October 7, 2025. All times are shown in the local time of Boulder, Colorado, United States.
Full moonTuesday, October 7, 2025, 12:35 AM
New moonTuesday, October 21, 2025, 5:45 AM
| Day | Phase | Illumination | Moonrise | Moonset |
|---|---|---|---|---|
| 1 | Waxing Gibbous | 68% | 3:39 PM | 12:51 AM |
| 2 | Waxing Gibbous | 77% | 4:17 PM | 2:05 AM |
| 3 | Waxing Gibbous | 86% | 4:30 PM | 3:24 AM |
| 4 | Waxing Gibbous | 92% | 5:18 PM | 4:21 AM |
| 5 | Waxing Gibbous | 97% | 5:36 PM | 5:34 AM |
| 6 | Full Moon | 100% | 5:52 PM | 6:32 AM |
| 7 | Full Moon | 99% | 6:22 PM | 7:57 AM |
| 8 | Waning Gibbous | 97% | 6:39 PM | 9:28 AM |
| 9 | Waning Gibbous | 91% | 7:33 PM | 10:27 AM |
| 10 | Waning Gibbous | 83% | 8:21 PM | 11:52 AM |
| 11 | Waning Gibbous | 74% | 9:14 PM | 1:20 PM |
| 12 | Waning Gibbous | 63% | 10:14 PM | 2:16 PM |
| 13 | Last Quarter | 51% | 11:33 PM | 3:12 PM |
| 14 | Last Quarter | 40% | — | 3:41 PM |
| 15 | Waning Crescent | 30% | 12:31 AM | 4:18 PM |
| 16 | Waning Crescent | 20% | 1:53 AM | 4:29 PM |
| 17 | Waning Crescent | 13% | 3:14 AM | 5:08 PM |
| 18 | Waning Crescent | 7% | 4:16 AM | 5:31 PM |
| 19 | Waning Crescent | 3% | 5:26 AM | 5:38 PM |
| 20 | New Moon | 0% | 6:20 AM | 6:07 PM |
| 21 | New Moon | 0% | 7:28 AM | 6:23 PM |
| 22 | Waxing Crescent | 2% | 8:20 AM | 6:43 PM |
| 23 | Waxing Crescent | 5% | 9:29 AM | 7:32 PM |
| 24 | Waxing Crescent | 10% | 10:20 AM | 8:05 PM |
| 25 | Waxing Crescent | 16% | 11:27 AM | 8:48 PM |
| 26 | Waxing Crescent | 24% | 12:12 PM | 9:41 PM |
| 27 | Waxing Crescent | 32% | 12:54 PM | 10:33 PM |
| 28 | First Quarter | 42% | 1:38 PM | 11:43 PM |
| 29 | First Quarter | 52% | 2:16 PM | — |
| 30 | Waxing Gibbous | 62% | 2:30 PM | 12:54 AM |
| 31 | Waxing Gibbous | 73% | 3:26 PM | 2:10 AM |
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Frequently asked questions
When is the full moon in October 2025 in Boulder, Colorado, United States?
The full moon peaks on Tuesday, October 7, 2025, 12:35 AM (local time).
When is the new moon in October 2025?
The new moon falls on Tuesday, October 21, 2025, 5:45 AM (local time) — the darkest nights of the month, best for stargazing.
Data: Meeus astronomical algorithms. How we calculate this
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