4U9 Hyak Airbase night times
Dell, MT
Night of Nov 6 to Nov 7MST
Position lights
§ 91.2095:13 PMto7:17 AM
Sunset to sunrise. Lights on.
0013Z to 1417Z
Night logging
§ 1.15:43 PMto6:46 AM
Civil twilight. Log it as night.
0043Z to 1346Z
Night currency
§ 61.57(b)6:13 PMto6:17 AM
One hour after sunset. Landings count.
0113Z to 1317Z
Evenings at 4U9
When each night begins, through the year. Local time.
| Date | SunsetLights on | Civil twilight endsLog night | 1 hr after sunsetLandings count |
|---|---|---|---|
| Nov 1MST | 5:19 PM | 5:50 PM | 6:19 PM |
| Nov 15MST | 5:02 PM | 5:34 PM | 6:02 PM |
| Dec 1MST | 4:52 PM | 5:24 PM | 5:52 PM |
| Dec 15MST | 4:51 PM | 5:24 PM | 5:51 PM |
| Jan 1MST | 5:01 PM | 5:34 PM | 6:01 PM |
| Jan 15MST | 5:16 PM | 5:49 PM | 6:16 PM |
| Feb 1MST | 5:39 PM | 6:10 PM | 6:39 PM |
| Feb 15MST | 5:59 PM | 6:29 PM | 6:59 PM |
| Mar 1MST | 6:18 PM | 6:48 PM | 7:18 PM |
| Mar 15MDT | 7:37 PM | 8:06 PM | 8:37 PM |
| Apr 1MDT | 7:58 PM | 8:28 PM | 8:58 PM |
| Apr 15MDT | 8:16 PM | 8:47 PM | 9:16 PM |
| May 1MDT | 8:36 PM | 9:08 PM | 9:36 PM |
| May 15MDT | 8:52 PM | 9:27 PM | 9:52 PM |
| Jun 1MDT | 9:09 PM | 9:46 PM | 10:09 PM |
| Jun 15MDT | 9:18 PM | 9:55 PM | 10:18 PM |
| Jul 1MDT | 9:20 PM | 9:57 PM | 10:20 PM |
| Jul 15MDT | 9:14 PM | 9:49 PM | 10:14 PM |
| Aug 1MDT | 8:57 PM | 9:30 PM | 9:57 PM |
| Aug 15MDT | 8:37 PM | 9:08 PM | 9:37 PM |
| Sep 1MDT | 8:08 PM | 8:38 PM | 9:08 PM |
| Sep 15MDT | 7:42 PM | 8:11 PM | 8:42 PM |
| Oct 1MDT | 7:12 PM | 7:41 PM | 8:12 PM |
| Oct 15MDT | 6:46 PM | 7:16 PM | 7:46 PM |
Mornings at 4U9
When each night ends. Local time.
| Date | 1 hr before sunriseLandings stop counting | Civil twilight beginsNight logging ends | SunriseLights off |
|---|---|---|---|
| Nov 1MST | 6:09 AM | 6:39 AM | 7:09 AM |
| Nov 15MST | 6:28 AM | 6:56 AM | 7:28 AM |
| Dec 1MST | 6:48 AM | 7:15 AM | 7:48 AM |
| Dec 15MST | 7:01 AM | 7:28 AM | 8:01 AM |
| Jan 1MST | 7:08 AM | 7:35 AM | 8:08 AM |
| Jan 15MST | 7:05 AM | 7:32 AM | 8:05 AM |
| Feb 1MST | 6:50 AM | 7:19 AM | 7:50 AM |
| Feb 15MST | 6:31 AM | 7:01 AM | 7:31 AM |
| Mar 1MST | 6:09 AM | 6:39 AM | 7:09 AM |
| Mar 15MDT | 6:43 AM | 7:14 AM | 7:43 AM |
| Apr 1MDT | 6:12 AM | 6:42 AM | 7:12 AM |
| Apr 15MDT | 5:47 AM | 6:16 AM | 6:47 AM |
| May 1MDT | 5:21 AM | 5:49 AM | 6:21 AM |
| May 15MDT | 5:03 AM | 5:29 AM | 6:03 AM |
| Jun 1MDT | 4:48 AM | 5:12 AM | 5:48 AM |
| Jun 15MDT | 4:45 AM | 5:08 AM | 5:45 AM |
| Jul 1MDT | 4:49 AM | 5:12 AM | 5:49 AM |
| Jul 15MDT | 4:59 AM | 5:24 AM | 5:59 AM |
| Aug 1MDT | 5:17 AM | 5:43 AM | 6:17 AM |
| Aug 15MDT | 5:33 AM | 6:01 AM | 6:33 AM |
| Sep 1MDT | 5:53 AM | 6:23 AM | 6:53 AM |
| Sep 15MDT | 6:10 AM | 6:40 AM | 7:10 AM |
| Oct 1MDT | 6:29 AM | 7:00 AM | 7:29 AM |
| Oct 15MDT | 6:46 AM | 7:17 AM | 7:46 AM |
Lights and runways
As the FAA lists them. NOTAMs aren't included, so check current NOTAMs before you fly.
ACTVT MIRL RY 14/32 & PAPI RY 14 - CTAF.
Runway 15/33
7,002 × 75 ft · Asphalt
Frequencies
Night at 4U9, in short
When can I log night time at 4U9?
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 5:43 PM to 6:46 AM MST.
When do landings at 4U9 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 6:13 PM to 6:17 AM MST.
When are position lights required at 4U9?
From sunset to sunrise (14 CFR 91.209(a)). On the night of Nov 6, 2026, that was 5:13 PM to 7:17 AM MST.
Nearby airports
- U00 Leadore Leadore, ID · 27 nm
- KDLN Dillon Dillon, MT · 32 nm
- U41 Dubois Municipal Dubois, ID · 41 nm
- 0U8 May May, ID · 51 nm
- KRVF Ruby Valley Field Twin Bridges, MT · 51 nm
- 1U2 Mud Lake/West Jefferson County Mud Lake, ID · 54 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.