Grasmere Airport
U91 · Grasmere, ID · Non-towered · Print kneeboard
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Weather
METAR observed
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TAF forecast
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Sun & FAA night2026-08-04 · night begins 09:31 PM
| Event | Local (MDT) | UTC |
|---|---|---|
| Morning civil twilight Loggable night ends | 06:07 AM | 12:07Z |
| Sunrise | 06:39 AM | 12:39Z |
| Sunset | 09:00 PM | 03:00Z |
| Evening civil twilight Loggable night begins | 09:31 PM | 03:31Z |
Plan a flight from U91
Winds aloft NOAA forecast · 3,000 to 53,000 ft
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Advisories
NOTAMs
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Pilot reports
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Airspace hazards
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Runways
RWY 23LEFT traffic
- Heading
- 233° mag · 249° true
- Dimensions
- 2,750 × 150 ft
- TPA
- 6,100 ft MSL (≈1,000 AGL) · standard
- Surface
- Dirt
- CTAF
- 122.9
Enter the left downwind (heading 053°) on the 45° at 6,100 ft MSL (≈1,000 AGL).
More details — RWY 23
- Threshold elev
- 5,127 ft
Pattern side: FAA NASR · TPA standard 1,000 ft AGL (not charted) · layout: FAA runway-end coordinates
| Runway | Length | Your margin |
|---|---|---|
| 05/23 | 2,750 ft |
Prefer one flat page? Full runway details for U91 → · New to pattern entries? The 45° entry, explained → · Teaching here? Print the U91 kneeboard →
Comms & NavAids
Communication frequencies
Taxi & takeoff
Source: FAA NASR (current 28-day cycle).
Prefer one flat list? All U91 frequencies →
Charts & procedures
Airport info
Airport information
- FAA LID
- U91
- Coordinates
- 42.3733, -115.8795
- Elevation
- 5,144 ft MSL
- Magnetic variation
- 16E
- Sectional chart
- SALT LAKE CITY
- Airport use
- Public
- Control tower
- No
- ARTCC
- SALT LAKE CITY (ZLC)
- Flight service (FSS)
- BOISE · 122.6 · 1-800-WX-BRIEF
- NOTAM facility
- BOI
- Attendance
- UNATNDD
- Segmented circle
- Yes
- Wind indicator
- yes
- Activated
- 1956/04
- Distance from city
- 0 S
Night operations
- Pilot-controlled lighting
- Usually keyed on CTAF 122.9 — confirm the click sequence in the Chart Supplement ↗
FAA night windows (civil twilight, loggable night §1.1, currency §61.57) are under Sun & FAA night in the Weather section.
Services fuel · repairs · oxygen · attendance
- Bottled oxygen
- NONE
- Bulk oxygen
- NONE
- Airframe service
- NONE
- Powerplant service
- NONE
Ownership & management 2 contacts
Remarks FAA · 6 notes
General
- NO WINTER MAINTENANCE.
- RY 05/23 SFC MAY BE POOR DUE TO DAMAGE BY LIVESTOCK; GROUND VEHICLES AND RODENTS.
- NO TELEPHONE AVBL AT ARPT.
- FOR CD CTC SALT LAKE ARTCC AT 801-320-2568.
Runways
- 05/23 EDGES & THRS MARKED WITH WHITE ROCKS.
Obstructions
- RY 05, 4 FT FENCE AT 90 FT ON CNTRLN; 7 FT ROAD AT 150 FT ON CNTRLN. 65 FT MARKED POWERLINE AT 900 FT ON CNTRLN.
Nearby airports
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Also nearby: 10U Owyhee Airport (29 NM) · 3U0 Murphy Hot Springs Airport (32 NM) · ID42 Poplar Point Airport (private) (34 NM) · NV08 Petan Ranch Airport (private) (41 NM) · 2ID3 Josephine Ranch Airport (private) (42 NM)
About U91
Grasmere Airport (U91) is an airport in Grasmere, ID, at 5,144 ft MSL. It has 1 runway, the longest 2,750 ft, with no control tower (pilot-controlled). This page shows live METAR/TAF weather, runway crosswinds, frequencies, navaids, and FAA charts for U91, refreshed from the Aviation Weather Center and FAA NASR.
Does U91 have a control tower?
No. Grasmere Airport is a non-towered (pilot-controlled) airport; use the published CTAF/UNICOM in the Comms & NavAids section.
What is the longest runway at U91?
Grasmere Airport has 1 runway; the longest is 2,750 ft. See the Runways section for headings, surface, and lighting.
Where is U91?
Grasmere Airport is in Grasmere, ID, at an elevation of 5,144 ft MSL. Coordinates: 42.3733, -115.8795.
Fly out of U91 often?
Save U91 as your home base in the SkyReady app for a one-tap Go/No-Go readiness brief, weather alerts, and automatic FAA currency — free to log.
Weather is live from the Aviation Weather Center; airport facility data is from the FAA NASR (28-day cycle). For planning and education only; always verify against official sources. Open U91 in a full tool: METAR/TAF decoder, crosswind calculator, sun & night times, or the density altitude calculator. Planning from here? Find the nearest airport with fuel or an approach, or check whether an IFR alternate is required.