B70 Tiber Dam night times
Tiber Dam, MT
Night of Nov 6 to Nov 7MST
Position lights
§ 91.2094:57 PMto7:20 AM
Sunset to sunrise. Lights on.
2357Z to 1420Z
Night logging
§ 1.15:31 PMto6:46 AM
Civil twilight. Log it as night.
0031Z to 1346Z
Night currency
§ 61.57(b)5:57 PMto6:20 AM
One hour after sunset. Landings count.
0057Z to 1320Z
Evenings at B70
When each night begins, through the year. Local time.
| Date | SunsetLights on | Civil twilight endsLog night | 1 hr after sunsetLandings count |
|---|---|---|---|
| Nov 1MST | 5:05 PM | 5:38 PM | 6:05 PM |
| Nov 15MST | 4:46 PM | 5:20 PM | 5:46 PM |
| Dec 1MST | 4:32 PM | 5:08 PM | 5:32 PM |
| Dec 15MST | 4:30 PM | 5:07 PM | 5:30 PM |
| Jan 1MST | 4:41 PM | 5:17 PM | 5:41 PM |
| Jan 15MST | 4:58 PM | 5:33 PM | 5:58 PM |
| Feb 1MST | 5:24 PM | 5:57 PM | 6:24 PM |
| Feb 15MST | 5:46 PM | 6:18 PM | 6:46 PM |
| Mar 1MST | 6:08 PM | 6:40 PM | 7:08 PM |
| Mar 15MDT | 7:30 PM | 8:01 PM | 8:30 PM |
| Apr 1MDT | 7:55 PM | 8:27 PM | 8:55 PM |
| Apr 15MDT | 8:15 PM | 8:48 PM | 9:15 PM |
| May 1MDT | 8:38 PM | 9:14 PM | 9:38 PM |
| May 15MDT | 8:58 PM | 9:35 PM | 9:58 PM |
| Jun 1MDT | 9:17 PM | 9:58 PM | 10:17 PM |
| Jun 15MDT | 9:27 PM | 10:09 PM | 10:27 PM |
| Jul 1MDT | 9:29 PM | 10:10 PM | 10:29 PM |
| Jul 15MDT | 9:21 PM | 10:01 PM | 10:21 PM |
| Aug 1MDT | 9:01 PM | 9:38 PM | 10:01 PM |
| Aug 15MDT | 8:38 PM | 9:13 PM | 9:38 PM |
| Sep 1MDT | 8:06 PM | 8:38 PM | 9:06 PM |
| Sep 15MDT | 7:37 PM | 8:08 PM | 8:37 PM |
| Oct 1MDT | 7:04 PM | 7:35 PM | 8:04 PM |
| Oct 15MDT | 6:36 PM | 7:07 PM | 7:36 PM |
Mornings at B70
When each night ends. Local time.
| Date | 1 hr before sunriseLandings stop counting | Civil twilight beginsNight logging ends | SunriseLights off |
|---|---|---|---|
| Nov 1MST | 6:10 AM | 6:38 AM | 7:10 AM |
| Nov 15MST | 6:32 AM | 6:58 AM | 7:32 AM |
| Dec 1MST | 6:55 AM | 7:19 AM | 7:55 AM |
| Dec 15MST | 7:09 AM | 7:32 AM | 8:09 AM |
| Jan 1MST | 7:16 AM | 7:39 AM | 8:16 AM |
| Jan 15MST | 7:11 AM | 7:35 AM | 8:11 AM |
| Feb 1MST | 6:53 AM | 7:19 AM | 7:53 AM |
| Feb 15MST | 6:32 AM | 6:59 AM | 7:32 AM |
| Mar 1MST | 6:06 AM | 6:35 AM | 7:06 AM |
| Mar 15MDT | 6:38 AM | 7:07 AM | 7:38 AM |
| Apr 1MDT | 6:03 AM | 6:31 AM | 7:03 AM |
| Apr 15MDT | 5:35 AM | 6:02 AM | 6:35 AM |
| May 1MDT | 5:06 AM | 5:31 AM | 6:06 AM |
| May 15MDT | 4:45 AM | 5:07 AM | 5:45 AM |
| Jun 1MDT | 4:28 AM | 4:48 AM | 5:28 AM |
| Jun 15MDT | 4:23 AM | 4:41 AM | 5:23 AM |
| Jul 1MDT | 4:28 AM | 4:46 AM | 5:28 AM |
| Jul 15MDT | 4:39 AM | 5:00 AM | 5:39 AM |
| Aug 1MDT | 5:00 AM | 5:23 AM | 6:00 AM |
| Aug 15MDT | 5:18 AM | 5:44 AM | 6:18 AM |
| Sep 1MDT | 5:42 AM | 6:09 AM | 6:42 AM |
| Sep 15MDT | 6:01 AM | 6:30 AM | 7:01 AM |
| Oct 1MDT | 6:24 AM | 6:53 AM | 7:24 AM |
| Oct 15MDT | 6:44 AM | 7:13 AM | 7:44 AM |
Lights and runways
As the FAA lists them. NOTAMs aren't included, so check current NOTAMs before you fly.
Runway 12/30
2,550 × 90 ft · Turf
Frequencies
Night at B70, in short
When can I log night time at B70?
From the end of evening civil twilight to the beginning of morning civil twilight, when the sun is 6° below the horizon (14 CFR 1.1). On the night of Nov 6, 2026, that was 5:31 PM to 6:46 AM MST.
When do landings at B70 count for night currency?
From one hour after sunset to one hour before sunrise. To carry passengers at night you need 3 takeoffs and 3 full-stop landings in that period within the last 90 days (14 CFR 61.57(b)). On the night of Nov 6, 2026, that was 5:57 PM to 6:20 AM MST.
When are position lights required at B70?
From sunset to sunrise (14 CFR 91.209(a)). On the night of Nov 6, 2026, that was 4:57 PM to 7:20 AM MST.
Nearby airports
- KLTY Liberty County Chester, MT · 13 nm
- KSBX Shelby Shelby, MT · 33 nm
- 79S Fort Benton Fort Benton, MT · 34 nm
- S01 Conrad Conrad, MT · 36 nm
- 5U1 Dutton Dutton, MT · 37 nm
- 3U8 Big Sandy Big Sandy, MT · 41 nm
Times are worked out from the sun's position for a sea-level horizon, rounded to the minute. Airport data from the FAA NASR cycle of Oct 29, 2026.