Grasmere

U91 · Grasmere, ID · Non-towered · Print kneeboard · Open on the map

Elevation

5,144 ft MSL

Longest runway

2,750 ft 05/23

Runway

Mag var

16E

CTAF 122.9

Nearby now

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Weather

METAR observed

No weather station at U91. Nearby reporting stations: KMUO (40 NM), KGNG (59 NM), KTWF (62 NM).

TAF forecast

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Sun & FAA night2026-11-02 · night begins 06:05 PM

Event	Local (MST)	UTC
Morning civil twilight Loggable night ends	06:49 AM	13:49Z
Sunrise	07:18 AM	14:18Z
Sunset	05:36 PM	00:36Z
Evening civil twilight Loggable night begins	06:05 PM	01:05Z

Loggable night (§1.1)

06:05 PM → 06:49 AM

Night currency (§61.57)

06:36 PM → 06:18 AM

Plan a flight from U91

Destination

TAS (kt)Burn (gph)Reserve (hr)Cruise (ft)Max alt (ft)Wind from (°)Wind (kt)

Winds aloft NOAA forecast · 3,000 to 53,000 ft

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Full reports: nearest reporting station

Advisories

NOTAMs · Loading NOTAMs…

Pilot reports · Loading PIREPs…

Airspace hazards · Checking SIGMETs and G-AIRMETs…

Temporary flight restrictions · Checking for TFRs…

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

Condition: Fair.

Pattern side: FAA NASR · TPA standard 1,000 ft AGL (not charted) · layout: FAA runway-end coordinates

Will it fit? Your aircraft's required runway length (from the POH) — checked against every runway here

ft · ≥1.5× comfortable, under 1.25× tight · saved across airports

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

CTAF

122.9

Source: FAA NASR (current 28-day cycle).

Prefer one flat list? All U91 frequencies →

Charts & procedures

PDF ↗

Chart Supplement ↗

VFR sectional →

Airport info

Airport information

FAA LID: U91
Coordinates: 42.3733, -115.8794
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

Owner

STATE OF IDAHO-DIV. OF AERONAUTICS

BOX 7129, BOISE, ID

208-334-8775

Manager

DIV. OF AERONAUTICS

BOX 7129, BOISE, ID

208-334-8775

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 (29 NM) · 3U0 Murphy Hot Springs (32 NM) · ID42 Poplar Point (private) (34 NM) · NV08 Petan Ranch (private) (41 NM) · U89 Glenns Ferry Municipal (42 NM)

About U91

Grasmere (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 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 has 1 runway; the longest is 2,750 ft. See the Runways section for headings, surface, and lighting.

Where is U91?

Grasmere is in Grasmere, ID, at an elevation of 5,144 ft MSL. Coordinates: 42.3733, -115.8794.

More about U91

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.

Something here wrong or out of date? Report a data problem.