Pick the dates from geometry.
Moon and darkness timing can be calculated ahead; weather becomes less certain further out. Choose the window now and check the cloud when it gets close. Thirty nights at Cosmic Campground.
18 Sept · Cosmic Campground
First quarter · 54% lit at local midnight.
Astronomical darkness
18 Sept · 21:00 → 19 Sept · 05:40 (8.7h)
Moon below horizon during darkness
5.3h total.
Longest window for your filters
19 Sept · 00:20 → 19 Sept · 05:40 Does not meet your minimum duration.
Times in America/Denver · approximately 20-minute samples. Geometry only, not a weather forecast.
19 Sept · Cosmic Campground
Waxing gibbous · 63% lit at local midnight.
Astronomical darkness
19 Sept · 21:00 → 20 Sept · 05:40 (8.7h)
Moon below horizon during darkness
4.3h total.
Longest window for your filters
20 Sept · 01:20 → 20 Sept · 05:40 Does not meet your minimum duration.
Times in America/Denver · approximately 20-minute samples. Geometry only, not a weather forecast.
20 Sept · Cosmic Campground
Waxing gibbous · 72% lit at local midnight.
Astronomical darkness
20 Sept · 20:40 → 21 Sept · 06:00 (9.3h)
Moon below horizon during darkness
3.7h total.
Longest window for your filters
21 Sept · 02:20 → 21 Sept · 06:00 Does not meet your minimum duration.
Times in America/Denver · approximately 20-minute samples. Geometry only, not a weather forecast.
21 Sept · Cosmic Campground
Waxing gibbous · 80% lit at local midnight.
Astronomical darkness
21 Sept · 20:40 → 22 Sept · 06:00 (9.3h)
Moon below horizon during darkness
2.7h total.
Longest window for your filters
22 Sept · 03:20 → 22 Sept · 06:00 Does not meet your minimum duration.
Times in America/Denver · approximately 20-minute samples. Geometry only, not a weather forecast.
22 Sept · Cosmic Campground
Waxing gibbous · 87% lit at local midnight.
Astronomical darkness
22 Sept · 20:40 → 23 Sept · 06:00 (9.3h)
Moon below horizon during darkness
1.7h total.
Longest window for your filters
23 Sept · 04:20 → 23 Sept · 06:00 Does not meet your minimum duration.
Times in America/Denver · approximately 20-minute samples. Geometry only, not a weather forecast.
23 Sept · Cosmic Campground
Waxing gibbous · 93% lit at local midnight.
Astronomical darkness
23 Sept · 20:40 → 24 Sept · 06:00 (9.3h)
Moon below horizon during darkness
0.7h total.
Longest window for your filters
24 Sept · 05:20 → 24 Sept · 06:00 Does not meet your minimum duration.
Times in America/Denver · approximately 20-minute samples. Geometry only, not a weather forecast.
24 Sept · Cosmic Campground
Waxing gibbous · 97% lit at local midnight.
Astronomical darkness
24 Sept · 20:40 → 25 Sept · 06:00 (9.3h)
Moon below horizon during darkness
0.0h total.
Longest window for your filters
None. Does not meet your minimum duration.
Times in America/Denver · approximately 20-minute samples. Geometry only, not a weather forecast.
25 Sept · Cosmic Campground
Full moon · 100% lit at local midnight.
Astronomical darkness
25 Sept · 20:40 → 26 Sept · 06:00 (9.3h)
Moon below horizon during darkness
0.0h total.
Longest window for your filters
None. Does not meet your minimum duration.
Times in America/Denver · approximately 20-minute samples. Geometry only, not a weather forecast.
26 Sept · Cosmic Campground
Full moon · 100% lit at local midnight.
Astronomical darkness
26 Sept · 20:40 → 27 Sept · 06:00 (9.3h)
Moon below horizon during darkness
0.0h total.
Longest window for your filters
None. Does not meet your minimum duration.
Times in America/Denver · approximately 20-minute samples. Geometry only, not a weather forecast.
27 Sept · Cosmic Campground
Waning gibbous · 97% lit at local midnight.
Astronomical darkness
27 Sept · 20:40 → 28 Sept · 06:00 (9.3h)
Moon below horizon during darkness
0.0h total.
Longest window for your filters
None. Does not meet your minimum duration.
Times in America/Denver · approximately 20-minute samples. Geometry only, not a weather forecast.
28 Sept · Cosmic Campground
Waning gibbous · 92% lit at local midnight.
Astronomical darkness
28 Sept · 20:40 → 29 Sept · 06:00 (9.3h)
Moon below horizon during darkness
0.0h total.
Longest window for your filters
None. Does not meet your minimum duration.
Times in America/Denver · approximately 20-minute samples. Geometry only, not a weather forecast.
29 Sept · Cosmic Campground
Waning gibbous · 85% lit at local midnight.
Astronomical darkness
29 Sept · 20:40 → 30 Sept · 06:00 (9.3h)
Moon below horizon during darkness
0.0h total.
Longest window for your filters
None. Does not meet your minimum duration.
Times in America/Denver · approximately 20-minute samples. Geometry only, not a weather forecast.
30 Sept · Cosmic Campground
Waning gibbous · 76% lit at local midnight.
Astronomical darkness
30 Sept · 20:40 → 1 Oct · 06:00 (9.3h)
Moon below horizon during darkness
1.0h total.
Longest window for your filters
30 Sept · 20:40 → 30 Sept · 21:40 Does not meet your minimum duration.
Times in America/Denver · approximately 20-minute samples. Geometry only, not a weather forecast.
1 Oct · Cosmic Campground
Waning gibbous · 66% lit at local midnight.
Astronomical darkness
1 Oct · 20:40 → 2 Oct · 06:00 (9.3h)
Moon below horizon during darkness
2.0h total.
Longest window for your filters
1 Oct · 20:40 → 1 Oct · 22:40 Does not meet your minimum duration.
Times in America/Denver · approximately 20-minute samples. Geometry only, not a weather forecast.
2 Oct · Cosmic Campground
Last quarter · 54% lit at local midnight.
Astronomical darkness
2 Oct · 20:40 → 3 Oct · 06:00 (9.3h)
Moon below horizon during darkness
3.0h total.
Longest window for your filters
2 Oct · 20:40 → 2 Oct · 23:40 Does not meet your minimum duration.
Times in America/Denver · approximately 20-minute samples. Geometry only, not a weather forecast.
3 Oct · Cosmic Campground
Last quarter · 42% lit at local midnight.
Astronomical darkness
3 Oct · 20:40 → 4 Oct · 06:00 (9.3h)
Moon below horizon during darkness
4.0h total.
Longest window for your filters
3 Oct · 20:40 → 4 Oct · 06:00 Meets your minimum duration.
Times in America/Denver · approximately 20-minute samples. Geometry only, not a weather forecast.
4 Oct · Cosmic Campground
Waning crescent · 31% lit at local midnight.
Astronomical darkness
4 Oct · 20:20 → 5 Oct · 06:00 (9.7h)
Moon below horizon during darkness
5.7h total.
Longest window for your filters
4 Oct · 20:20 → 5 Oct · 06:00 Meets your minimum duration.
Times in America/Denver · approximately 20-minute samples. Geometry only, not a weather forecast.
5 Oct · Cosmic Campground
Waning crescent · 21% lit at local midnight.
Astronomical darkness
5 Oct · 20:20 → 6 Oct · 06:00 (9.7h)
Moon below horizon during darkness
7.0h total.
Longest window for your filters
5 Oct · 20:20 → 6 Oct · 06:00 Meets your minimum duration.
Times in America/Denver · approximately 20-minute samples. Geometry only, not a weather forecast.
6 Oct · Cosmic Campground
Waning crescent · 12% lit at local midnight.
Astronomical darkness
6 Oct · 20:20 → 7 Oct · 06:00 (9.7h)
Moon below horizon during darkness
8.0h total.
Longest window for your filters
6 Oct · 20:20 → 7 Oct · 06:00 Meets your minimum duration.
Times in America/Denver · approximately 20-minute samples. Geometry only, not a weather forecast.
7 Oct · Cosmic Campground
Waning crescent · 6% lit at local midnight.
Astronomical darkness
7 Oct · 20:20 → 8 Oct · 06:00 (9.7h)
Moon below horizon during darkness
9.0h total.
Longest window for your filters
7 Oct · 20:20 → 8 Oct · 06:00 Meets your minimum duration.
Times in America/Denver · approximately 20-minute samples. Geometry only, not a weather forecast.
8 Oct · Cosmic Campground
Waning crescent · 2% lit at local midnight.
Astronomical darkness
8 Oct · 20:20 → 9 Oct · 06:00 (9.7h)
Moon below horizon during darkness
9.7h total.
Longest window for your filters
8 Oct · 20:20 → 9 Oct · 06:00 Meets your minimum duration.
Times in America/Denver · approximately 20-minute samples. Geometry only, not a weather forecast.
9 Oct · Cosmic Campground
New moon · 0% lit at local midnight.
Astronomical darkness
9 Oct · 20:20 → 10 Oct · 06:00 (9.7h)
Moon below horizon during darkness
9.7h total.
Longest window for your filters
9 Oct · 20:20 → 10 Oct · 06:00 Meets your minimum duration.
Times in America/Denver · approximately 20-minute samples. Geometry only, not a weather forecast.
10 Oct · Cosmic Campground
New moon · 1% lit at local midnight.
Astronomical darkness
10 Oct · 20:20 → 11 Oct · 06:00 (9.7h)
Moon below horizon during darkness
9.7h total.
Longest window for your filters
10 Oct · 20:20 → 11 Oct · 06:00 Meets your minimum duration.
Times in America/Denver · approximately 20-minute samples. Geometry only, not a weather forecast.
11 Oct · Cosmic Campground
Waxing crescent · 3% lit at local midnight.
Astronomical darkness
11 Oct · 20:20 → 12 Oct · 06:00 (9.7h)
Moon below horizon during darkness
9.7h total.
Longest window for your filters
11 Oct · 20:20 → 12 Oct · 06:00 Meets your minimum duration.
Times in America/Denver · approximately 20-minute samples. Geometry only, not a weather forecast.
12 Oct · Cosmic Campground
Waxing crescent · 8% lit at local midnight.
Astronomical darkness
12 Oct · 20:20 → 13 Oct · 06:00 (9.7h)
Moon below horizon during darkness
9.7h total.
Longest window for your filters
12 Oct · 20:20 → 13 Oct · 06:00 Meets your minimum duration.
Times in America/Denver · approximately 20-minute samples. Geometry only, not a weather forecast.
13 Oct · Cosmic Campground
Waxing crescent · 13% lit at local midnight.
Astronomical darkness
13 Oct · 20:20 → 14 Oct · 06:00 (9.7h)
Moon below horizon during darkness
9.3h total.
Longest window for your filters
13 Oct · 20:20 → 14 Oct · 06:00 Meets your minimum duration.
Times in America/Denver · approximately 20-minute samples. Geometry only, not a weather forecast.
14 Oct · Cosmic Campground
Waxing crescent · 21% lit at local midnight.
Astronomical darkness
14 Oct · 20:20 → 15 Oct · 06:00 (9.7h)
Moon below horizon during darkness
8.7h total.
Longest window for your filters
14 Oct · 20:20 → 15 Oct · 06:00 Meets your minimum duration.
Times in America/Denver · approximately 20-minute samples. Geometry only, not a weather forecast.
15 Oct · Cosmic Campground
Waxing crescent · 29% lit at local midnight.
Astronomical darkness
15 Oct · 20:20 → 16 Oct · 06:00 (9.7h)
Moon below horizon during darkness
7.7h total.
Longest window for your filters
15 Oct · 20:20 → 16 Oct · 06:00 Meets your minimum duration.
Times in America/Denver · approximately 20-minute samples. Geometry only, not a weather forecast.
16 Oct · Cosmic Campground
Waxing crescent · 37% lit at local midnight.
Astronomical darkness
16 Oct · 20:20 → 17 Oct · 06:00 (9.7h)
Moon below horizon during darkness
7.0h total.
Longest window for your filters
16 Oct · 20:20 → 17 Oct · 06:00 Meets your minimum duration.
Times in America/Denver · approximately 20-minute samples. Geometry only, not a weather forecast.
17 Oct · Cosmic Campground
First quarter · 47% lit at local midnight.
Astronomical darkness
17 Oct · 20:20 → 18 Oct · 06:00 (9.7h)
Moon below horizon during darkness
6.0h total.
Longest window for your filters
17 Oct · 20:20 → 18 Oct · 06:00 Meets your minimum duration.
Times in America/Denver · approximately 20-minute samples. Geometry only, not a weather forecast.
15 nights in a row meeting 6 h with under 50% illumination. 15 qualify across the 30.
The usable moonless stretch collapses to nothing around it. A good week for planets, doubles and lunar detail.
The moon moves about 12° east a day, so the dark window shifts roughly fifty minutes later each night. A Friday plan is not a Saturday plan.
Plan somewhere else
Sky geometry only — no weather claims beyond the seven-night forecast. How to plan around the moon →