U91 Grasmere night times
Grasmere, ID
Night of Nov 6 to Nov 7MST
Position lights
§ 91.2095:30 PMto7:25 AM
Sunset to sunrise. Lights on.
0030Z to 1425Z
Night logging
§ 1.16:00 PMto6:55 AM
Civil twilight. Log it as night.
0100Z to 1355Z
Night currency
§ 61.57(b)6:30 PMto6:25 AM
One hour after sunset. Landings count.
0130Z to 1325Z
Evenings at U91
When each night begins, through the year. Local time.
| Date | SunsetLights on | Civil twilight endsLog night | 1 hr after sunsetLandings count |
|---|---|---|---|
| Nov 1MST | 5:37 PM | 6:06 PM | 6:37 PM |
| Nov 15MST | 5:21 PM | 5:52 PM | 6:21 PM |
| Dec 1MST | 5:12 PM | 5:43 PM | 6:12 PM |
| Dec 15MST | 5:12 PM | 5:44 PM | 6:12 PM |
| Jan 1MST | 5:22 PM | 5:53 PM | 6:22 PM |
| Jan 15MST | 5:36 PM | 6:07 PM | 6:36 PM |
| Feb 1MST | 5:58 PM | 6:27 PM | 6:58 PM |
| Feb 15MST | 6:16 PM | 6:45 PM | 7:16 PM |
| Mar 1MST | 6:33 PM | 7:01 PM | 7:33 PM |
| Mar 15MDT | 7:50 PM | 8:18 PM | 8:50 PM |
| Apr 1MDT | 8:09 PM | 8:38 PM | 9:09 PM |
| Apr 15MDT | 8:25 PM | 8:54 PM | 9:25 PM |
| May 1MDT | 8:43 PM | 9:14 PM | 9:43 PM |
| May 15MDT | 8:58 PM | 9:31 PM | 9:58 PM |
| Jun 1MDT | 9:14 PM | 9:48 PM | 10:14 PM |
| Jun 15MDT | 9:22 PM | 9:57 PM | 10:22 PM |
| Jul 1MDT | 9:24 PM | 9:59 PM | 10:24 PM |
| Jul 15MDT | 9:19 PM | 9:52 PM | 10:19 PM |
| Aug 1MDT | 9:03 PM | 9:35 PM | 10:03 PM |
| Aug 15MDT | 8:45 PM | 9:15 PM | 9:45 PM |
| Sep 1MDT | 8:18 PM | 8:46 PM | 9:18 PM |
| Sep 15MDT | 7:53 PM | 8:21 PM | 8:53 PM |
| Oct 1MDT | 7:25 PM | 7:53 PM | 8:25 PM |
| Oct 15MDT | 7:02 PM | 7:30 PM | 8:02 PM |
Mornings at U91
When each night ends. Local time.
| Date | 1 hr before sunriseLandings stop counting | Civil twilight beginsNight logging ends | SunriseLights off |
|---|---|---|---|
| Nov 1MST | 6:17 AM | 6:48 AM | 7:17 AM |
| Nov 15MST | 6:35 AM | 7:04 AM | 7:35 AM |
| Dec 1MST | 6:53 AM | 7:22 AM | 7:53 AM |
| Dec 15MST | 7:06 AM | 7:34 AM | 8:06 AM |
| Jan 1MST | 7:13 AM | 7:41 AM | 8:13 AM |
| Jan 15MST | 7:10 AM | 7:39 AM | 8:10 AM |
| Feb 1MST | 6:57 AM | 7:27 AM | 7:57 AM |
| Feb 15MST | 6:40 AM | 7:11 AM | 7:40 AM |
| Mar 1MST | 6:19 AM | 6:51 AM | 7:19 AM |
| Mar 15MDT | 6:56 AM | 7:28 AM | 7:56 AM |
| Apr 1MDT | 6:26 AM | 6:58 AM | 7:26 AM |
| Apr 15MDT | 6:03 AM | 6:34 AM | 7:03 AM |
| May 1MDT | 5:39 AM | 6:08 AM | 6:39 AM |
| May 15MDT | 5:22 AM | 5:50 AM | 6:22 AM |
| Jun 1MDT | 5:09 AM | 5:35 AM | 6:09 AM |
| Jun 15MDT | 5:06 AM | 5:31 AM | 6:06 AM |
| Jul 1MDT | 5:10 AM | 5:36 AM | 6:10 AM |
| Jul 15MDT | 5:20 AM | 5:46 AM | 6:20 AM |
| Aug 1MDT | 5:36 AM | 6:04 AM | 6:36 AM |
| Aug 15MDT | 5:51 AM | 6:20 AM | 6:51 AM |
| Sep 1MDT | 6:09 AM | 6:40 AM | 7:09 AM |
| Sep 15MDT | 6:23 AM | 6:55 AM | 7:23 AM |
| Oct 1MDT | 6:41 AM | 7:13 AM | 7:41 AM |
| Oct 15MDT | 6:56 AM | 7:28 AM | 7:56 AM |
Lights and runways
As the FAA lists them. NOTAMs aren't included, so check current NOTAMs before you fly.
Runway 05/23
2,750 × 150 ft · Dirt
Frequencies
Night at U91, in short
When can I log night time at U91?
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 6:00 PM to 6:55 AM MST.
When do landings at U91 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 6:30 PM to 6:25 AM MST.
When are position lights required at U91?
From sunset to sunrise (14 CFR 91.209(a)). On the night of Nov 6, 2026, that was 5:30 PM to 7:25 AM MST.
Nearby airports
- 10U Owyhee Owyhee, NV · 29 nm
- 3U0 Murphy Hot Springs Three Creek, ID · 32 nm
- U89 Glenns Ferry Municipal Glenns Ferry, ID · 42 nm
- U76 Mountain Home Municipal Mountain Home, ID · 46 nm
- U03 Buhl Municipal Buhl, ID · 50 nm
- 08U Stevens-Crosby North Fork, NV · 51 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.