Moon · December 2025
Moon calendar for Fort Collins, Colorado, United States: December 2025
Daily moon phases, illumination, moonrise and moonset in Fort Collins, Colorado, United States for December 2025. Full moon: December 4, 2025. All times are shown in the local time of Fort Collins, Colorado, United States.
Full moonThursday, December 4, 2025, 4:18 PM
New moonFriday, December 19, 2025, 7:59 PM
| Day | Phase | Illumination | Moonrise | Moonset |
|---|---|---|---|---|
| 1 | Waxing Gibbous | 87% | 1:43 PM | 3:36 AM |
| 2 | Waxing Gibbous | 94% | 2:19 PM | 4:46 AM |
| 3 | Waxing Gibbous | 98% | 2:44 PM | 6:17 AM |
| 4 | Full Moon | 100% | 3:39 PM | 7:37 AM |
| 5 | Waning Gibbous | 99% | 4:27 PM | 8:40 AM |
| 6 | Waning Gibbous | 95% | 5:44 PM | 9:41 AM |
| 7 | Waning Gibbous | 89% | 7:07 PM | 10:29 AM |
| 8 | Waning Gibbous | 81% | 8:21 PM | 11:27 AM |
| 9 | Waning Gibbous | 72% | 9:37 PM | 11:41 AM |
| 10 | Waning Gibbous | 62% | 10:31 PM | 12:13 PM |
| 11 | Last Quarter | 52% | 11:46 PM | 12:24 PM |
| 12 | Last Quarter | 41% | — | 12:43 PM |
| 13 | Waning Crescent | 32% | 12:44 AM | 1:23 PM |
| 14 | Waning Crescent | 23% | 1:53 AM | 1:34 PM |
| 15 | Waning Crescent | 16% | 2:54 AM | 1:51 PM |
| 16 | Waning Crescent | 10% | 3:59 AM | 2:21 PM |
| 17 | Waning Crescent | 5% | 5:02 AM | 2:51 PM |
| 18 | Waning Crescent | 2% | 6:02 AM | 3:37 PM |
| 19 | New Moon | 0% | 6:53 AM | 4:22 PM |
| 20 | New Moon | 1% | 7:45 AM | 5:30 PM |
| 21 | Waxing Crescent | 3% | 8:26 AM | 6:21 PM |
| 22 | Waxing Crescent | 7% | 9:18 AM | 7:33 PM |
| 23 | Waxing Crescent | 13% | 9:41 AM | 8:26 PM |
| 24 | Waxing Crescent | 21% | 10:15 AM | 9:39 PM |
| 25 | Waxing Crescent | 30% | 10:28 AM | 10:43 PM |
| 26 | First Quarter | 41% | 10:58 AM | — |
| 27 | First Quarter | 52% | 11:32 AM | 12:07 AM |
| 28 | Waxing Gibbous | 63% | 11:43 AM | 1:29 AM |
| 29 | Waxing Gibbous | 74% | 12:19 PM | 2:26 AM |
| 30 | Waxing Gibbous | 84% | 12:37 PM | 3:48 AM |
| 31 | Waxing Gibbous | 91% | 1:35 PM | 5:25 AM |
Another city or date
Frequently asked questions
When is the full moon in December 2025 in Fort Collins, Colorado, United States?
The full moon peaks on Thursday, December 4, 2025, 4:18 PM (local time).
When is the new moon in December 2025?
The new moon falls on Friday, December 19, 2025, 7:59 PM (local time) — the darkest nights of the month, best for stargazing.
Data: Meeus astronomical algorithms. How we calculate this
More for Fort Collins, Colorado, United States
Near Fort Collins
- Greeley, Colorado, United States
- Boulder, Colorado, United States
- Cheyenne, Wyoming, United States
- Thornton, Colorado, United States
- Westminster, Colorado, United States
- Arvada, Colorado, United States
- Laramie, Wyoming, United States
- Denver, Colorado, United States
- Aurora, Colorado, United States
- Lakewood, Colorado, United States
- Centennial, Colorado, United States
- Colorado Springs, Colorado, United States