SkyAlmanac

Moon · May 2026

Moon calendar for Great Falls, Montana, United States: May 2026

Daily moon phases, illumination, moonrise and moonset in Great Falls, Montana, United States for May 2026. Full moon: May 1, 2026, May 31, 2026. All times are shown in the local time of Great Falls, Montana, United States.

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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% 8:54 PM 6:11 AM
2 Waning Gibbous 99% 10:06 PM 6:26 AM
3 Waning Gibbous 96% 11:13 PM 7:07 AM
4 Waning Gibbous 91% — 7:42 AM
5 Waning Gibbous 85% 12:04 AM 8:25 AM
6 Waning Gibbous 78% 12:41 AM 9:34 AM
7 Waning Gibbous 70% 1:34 AM 10:26 AM
8 Last Quarter 60% 1:59 AM 11:41 AM
9 Last Quarter 50% 2:23 AM 12:45 PM
10 Last Quarter 40% 2:33 AM 2:09 PM
11 Waning Crescent 30% 3:09 AM 3:30 PM
12 Waning Crescent 20% 3:31 AM 4:26 PM
13 Waning Crescent 12% 3:38 AM 5:48 PM
14 Waning Crescent 6% 3:52 AM 7:27 PM
15 Waning Crescent 2% 4:17 AM 8:33 PM
16 New Moon 0% 4:30 AM 10:11 PM
17 Waxing Crescent 1% 5:19 AM 11:38 PM
18 Waxing Crescent 5% 6:06 AM —
19 Waxing Crescent 12% 7:20 AM 12:33 AM
20 Waxing Crescent 20% 8:23 AM 1:36 AM
21 Waxing Crescent 30% 9:57 AM 2:06 AM
22 First Quarter 41% 11:31 AM 2:25 AM
23 First Quarter 52% 12:32 PM 2:33 AM
24 Waxing Gibbous 63% 2:02 PM 3:16 AM
25 Waxing Gibbous 73% 3:25 PM 3:31 AM
26 Waxing Gibbous 82% 4:23 PM 3:37 AM
27 Waxing Gibbous 89% 5:37 PM 3:48 AM
28 Waxing Gibbous 94% 6:33 PM 4:15 AM
29 Waxing Gibbous 98% 7:49 PM 4:27 AM
30 Full Moon 100% 8:52 PM 5:07 AM
31 Full Moon 100% 9:53 PM 5:40 AM

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Frequently asked questions

When is the full moon in May 2026 in Great Falls, Montana, 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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