Reference only — not for real-world navigation.
KS85
Big Sky Field · Culbertson
Key Facts
Essential technical summary for MSFS 2020/2024 and X-Plane.
ILS Approach StatusILS DATA NOT IN DATABASE
Field Elevation
1,954 ft / 596 m
Transition Altitude
18,000 ft
Primary Channel
CTAF 122.80 MHz (CTAF)
Live Conversion
inHg
hPa
Runway Summary (Quick-Links)
08/26 · 3,800 ft · AsphaltLIGHTEDFlight Planning
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Welcome to the technical flight briefing for Big Sky Field (KS85), located in Culbertson, 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 1,954 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
Big Sky Field
ICAO / IATA
KS85 / —
Municipality
Culbertson
Country
Region
US-MT — Montana
GPS Coordinates
Transition Altitude
18,000 ft
Elevation
1,954 ft
Pilot Toolbox
External charts, live tracking and weather reports.
Runway 08 / 26
LIGHTED
Runway Length: 3,800 ft / 1,158 m
Runway Width: 60 ft / 18 m
Surface Type: Asphalt
Heading: 90° / 270°
Runway Width: 60 ft / 18 m
Surface Type: Asphalt
Heading: 90° / 270°
RWY 08 (90°)
No ILS / Visual Only
RWY 26 (270°)
No ILS / Visual Only
CTAF CTAF
122.80 MHz
Base Airport Data: OurAirports (Public Domain)
Instrument Approach Data: AIP 2026 Researched · Cycle: Jan 2026