Moon · May 2026
Moon calendar for Boulder, Colorado, United States: May 2026
Daily moon phases, illumination, moonrise and moonset in Boulder, Colorado, United States for May 2026. Full moon: May 1, 2026, May 31, 2026. All times are shown in the local time of Boulder, Colorado, United States.
Full moonFriday, May 1, 2026, 11:27 AM
Full moonSunday, May 31, 2026, 2:55 AM
New moonSaturday, May 16, 2026, 1:30 PM
| Day | Phase | Illumination | Moonrise | Moonset |
|---|---|---|---|---|
| 1 | Full Moon | 100% | 8:12 PM | 6:03 AM |
| 2 | Waning Gibbous | 99% | 9:21 PM | 6:25 AM |
| 3 | Waning Gibbous | 96% | 10:18 PM | 7:15 AM |
| 4 | Waning Gibbous | 91% | 11:13 PM | 7:47 AM |
| 5 | Waning Gibbous | 85% | 11:51 PM | 8:28 AM |
| 6 | Waning Gibbous | 78% | — | 9:36 AM |
| 7 | Waning Gibbous | 70% | 12:27 AM | 10:26 AM |
| 8 | Last Quarter | 60% | 1:23 AM | 11:37 AM |
| 9 | Last Quarter | 50% | 1:41 AM | 12:31 PM |
| 10 | Last Quarter | 40% | 2:14 AM | 1:44 PM |
| 11 | Waning Crescent | 30% | 2:27 AM | 2:49 PM |
| 12 | Waning Crescent | 20% | 2:53 AM | 4:07 PM |
| 13 | Waning Crescent | 12% | 3:32 AM | 5:27 PM |
| 14 | Waning Crescent | 6% | 3:42 AM | 6:24 PM |
| 15 | Waning Crescent | 2% | 4:18 AM | 7:43 PM |
| 16 | New Moon | 0% | 4:36 AM | 9:14 PM |
| 17 | Waxing Crescent | 1% | 5:35 AM | 10:21 PM |
| 18 | Waxing Crescent | 5% | 6:21 AM | 11:35 PM |
| 19 | Waxing Crescent | 12% | 7:34 AM | — |
| 20 | Waxing Crescent | 20% | 8:33 AM | 12:22 AM |
| 21 | Waxing Crescent | 30% | 10:06 AM | 1:16 AM |
| 22 | First Quarter | 41% | 11:30 AM | 1:38 AM |
| 23 | First Quarter | 52% | 12:26 PM | 2:13 AM |
| 24 | Waxing Gibbous | 63% | 1:40 PM | 2:25 AM |
| 25 | Waxing Gibbous | 73% | 2:36 PM | 2:47 AM |
| 26 | Waxing Gibbous | 82% | 3:49 PM | 3:28 AM |
| 27 | Waxing Gibbous | 89% | 4:51 PM | 3:37 AM |
| 28 | Waxing Gibbous | 94% | 5:59 PM | 4:06 AM |
| 29 | Waxing Gibbous | 98% | 7:04 PM | 4:25 AM |
| 30 | Full Moon | 100% | 8:04 PM | 5:12 AM |
| 31 | Full Moon | 100% | 8:56 PM | 5:41 AM |
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Frequently asked questions
When is the full moon in May 2026 in Boulder, Colorado, United States?
The full moon peaks on Friday, May 1, 2026, 11:27 AM; Sunday, May 31, 2026, 2:55 AM (local time).
When is the new moon in May 2026?
The new moon falls on Saturday, May 16, 2026, 1:30 PM (local time) — the darkest nights of the month, best for stargazing.
Data: Meeus astronomical algorithms. How we calculate this
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