Reference only — not for real-world navigation.
U91
Grasmere Airport · Grasmere
Key Facts
Essential technical summary for MSFS 2020/2024 and X-Plane.
ILS Approach StatusILS DATA NOT IN DATABASE
Field Elevation
5,134 ft / 1,565 m
Transition Altitude
18,000 ft
Primary Channel
—
Live Conversion
inHg
hPa
Runway Summary (Quick-Links)
05/23 · 2,750 ft · DIRT-FUNLITFlight Planning
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Welcome to the technical flight briefing for Grasmere Airport (U91), located in Grasmere, United States. As a vital hub for Microsoft Flight Simulator 2024, MSFS 2020, and X-Plane pilots, this facility features 1 active runway with a maximum elevation of 5,134 ft. Please note that this field primarily supports VFR and visual approach procedures.Reference the data below for primary communication channels and detailed runway characteristics. Pilots should observe a Transition Altitude of 18,000 ft verified for this field for altimeter reset procedures.
Full Name
Grasmere Airport
ICAO / IATA
U91 / —
Municipality
Grasmere
Country
Region
US-ID — Idaho
GPS Coordinates
Transition Altitude
18,000 ft
Elevation
5,134 ft
Pilot Toolbox
External charts, live tracking and weather reports.
Runway 05 / 23
UNLIT
Runway Length: 2,750 ft / 838 m
Runway Width: 150 ft / 46 m
Surface Type: DIRT-F
Heading: —° / —°
Runway Width: 150 ft / 46 m
Surface Type: DIRT-F
Heading: —° / —°
RWY 05
No ILS / Visual Only
RWY 23
No ILS / Visual Only
No frequency data available.
Base Airport Data: OurAirports (Public Domain)
Instrument Approach Data: AIP 2026 Researched · Cycle: Jan 2026