Moon · September 2025
Moon calendar for Fort Collins, Colorado, United States: September 2025
Daily moon phases, illumination, moonrise and moonset in Fort Collins, Colorado, United States for September 2025. Full moon: September 7, 2025. All times are shown in the local time of Fort Collins, Colorado, United States.
Full moonSunday, September 7, 2025, 1:53 PM
New moonSunday, September 21, 2025, 10:49 AM
| Day | Phase | Illumination | Moonrise | Moonset |
|---|---|---|---|---|
| 1 | Waxing Gibbous | 65% | 3:37 PM | 12:12 AM |
| 2 | Waxing Gibbous | 74% | 4:22 PM | 1:03 AM |
| 3 | Waxing Gibbous | 82% | 5:15 PM | 2:02 AM |
| 4 | Waxing Gibbous | 89% | 5:40 PM | 3:16 AM |
| 5 | Waxing Gibbous | 95% | 6:18 PM | 4:18 AM |
| 6 | Waxing Gibbous | 99% | 6:29 PM | 5:33 AM |
| 7 | Full Moon | 100% | 7:12 PM | 6:27 AM |
| 8 | Waning Gibbous | 99% | 7:35 PM | 7:43 AM |
| 9 | Waning Gibbous | 95% | 7:48 PM | 9:06 AM |
| 10 | Waning Gibbous | 89% | 8:21 PM | 10:19 AM |
| 11 | Waning Gibbous | 80% | 8:39 PM | 11:37 AM |
| 12 | Waning Gibbous | 70% | 9:34 PM | 12:56 PM |
| 13 | Last Quarter | 59% | 10:17 PM | 2:18 PM |
| 14 | Last Quarter | 47% | 11:26 PM | 3:35 PM |
| 15 | Waning Crescent | 36% | — | 4:23 PM |
| 16 | Waning Crescent | 25% | 12:23 AM | 5:24 PM |
| 17 | Waning Crescent | 16% | 1:41 AM | 5:44 PM |
| 18 | Waning Crescent | 9% | 2:54 AM | 6:18 PM |
| 19 | Waning Crescent | 4% | 4:16 AM | 6:28 PM |
| 20 | New Moon | 1% | 5:29 AM | 6:57 PM |
| 21 | New Moon | 0% | 6:23 AM | 7:29 PM |
| 22 | New Moon | 1% | 7:33 AM | 7:36 PM |
| 23 | Waxing Crescent | 4% | 8:24 AM | 7:57 PM |
| 24 | Waxing Crescent | 9% | 9:34 AM | 8:21 PM |
| 25 | Waxing Crescent | 15% | 10:24 AM | 8:39 PM |
| 26 | Waxing Crescent | 22% | 11:35 AM | 9:32 PM |
| 27 | Waxing Crescent | 30% | 12:25 PM | 10:06 PM |
| 28 | Waxing Crescent | 39% | 1:33 PM | 10:44 PM |
| 29 | First Quarter | 49% | 2:19 PM | 11:40 PM |
| 30 | First Quarter | 58% | 3:07 PM | — |
Another city or date
Frequently asked questions
When is the full moon in September 2025 in Fort Collins, Colorado, United States?
The full moon peaks on Sunday, September 7, 2025, 1:53 PM (local time).
When is the new moon in September 2025?
The new moon falls on Sunday, September 21, 2025, 10:49 AM (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